autolayout adjustments made for convenience

Source/Capture.swift

+////
+//// Copyright (C) 2015 GraphKit, Inc. <http://graphkit.io> and other GraphKit contributors.
+////
+//// This program is free software: you can redistribute it and/or modify
+//// it under the terms of the GNU Affero General Public License as published
+//// by the Free Software Foundation, either version 3 of the License, or
+//// (at your option) any later version.
+////
+//// This program is distributed in the hope that it will be useful,
+//// but WITHOUT ANY WARRANTY; without even the implied warranty of
+//// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//// GNU Affero General Public License for more details.
+////
+//// You should have received a copy of the GNU Affero General Public License
+//// along with this program located at the root of the software package
+//// in a file called LICENSE.  If not, see <http://www.gnu.org/licenses/>.
+////
 //
 //
-// Copyright (C) 2015 GraphKit, Inc. <http://graphkit.io> and other GraphKit contributors.
+//import UIKit
+//import AVFoundation
+//import AssetsLibrary
 //
 //
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published
-// by the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
+//@objc(CaptureDelegate)
+//public protocol CaptureDelegate {
+//	optional func captureDeviceConfigurationFailed(capture: Capture, error: NSError!)
+//	optional func captureMediaCaptureFailed(capture: Capture, error: NSError!)
+//	optional func captureAsetLibraryWriteFailed(capture: Capture, error: NSError!)
+//	optional func capture(capture: Capture, assetLibraryDidWrite image: UIImage!)
+//}
 //
 //
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program located at the root of the software package
-// in a file called LICENSE.  If not, see <http://www.gnu.org/licenses/>.
-//
-
-import UIKit
-import AVFoundation
-import AssetsLibrary
-
-@objc(CaptureDelegate)
-public protocol CaptureDelegate {
-	optional func captureDeviceConfigurationFailed(capture: Capture, error: NSError!)
-	optional func captureMediaCaptureFailed(capture: Capture, error: NSError!)
-	optional func captureAsetLibraryWriteFailed(capture: Capture, error: NSError!)
-	optional func capture(capture: Capture, assetLibraryDidWrite image: UIImage!)
-}
-
-public class Capture: NSObject, AVCaptureFileOutputRecordingDelegate {
-	//
-	//	:name:	activeVideoInput
-	//	:description:	The video input that is currently active.
-	//	
-	private var activeVideoInput: AVCaptureDeviceInput?
-	
-	//
-	//	:name:	imageOutput
-	//	:description:	When the session is taking a photo, this is the output manager.
-	//	
-	private lazy var imageOutput: AVCaptureStillImageOutput = AVCaptureStillImageOutput()
-	
-	//
-	//	:name:	movieOutput
-	//	:description:	When the session is shooting a video, this is the output manager.
-	//	
-	private lazy var movieOutput: AVCaptureMovieFileOutput = AVCaptureMovieFileOutput()
-	
-	//
-	//	:name:	movieOutputURL
-	//	:description:	The output URL of the movie file.
-	//	
-	private var movieOutputURL: NSURL?
-	
-	//
-	//	:name:	queue
-	//	:description:	Async job queue.
-	//	
-	private lazy var queue: dispatch_queue_t = {
-		return dispatch_queue_create("io.graphkit.Capture", nil)
-	}()
-	
-	//
-	//	:name:	CaptureAdjustingExposureContext
-	//	:description:	Used for KVO observation context.
-	//	
-	public var CaptureAdjustingExposureContext: NSString?
-	
-	/**
-	* cameraCount
-	* The number of available cameras on the device.
-	*/
-	public var cameraCount: Int {
-		return AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo).count
-	}
-	
-	/**
-	* session
-	* An AVCaptureSession that manages all inputs and outputs in that session.
-	*/
-	public lazy var session: AVCaptureSession = AVCaptureSession()
-	
-	/**
-	* delegate
-	* An optional instance of CaptureDelegate to handle events that are triggered during various
-	* stages in the session.
-	*/
-	public weak var delegate: CaptureDelegate?
-	
-	/**
-	* prepareSession
-	* A helper method that prepares the session with the various available inputs and outputs.
-	* @param		preset: String, default: AVCaptureSessionPresetHigh
-	* @return		A boolean value, true if successful, false otherwise.
-	*/
-	public func prepareSession(preset: String = AVCaptureSessionPresetHigh) -> Bool {
-		session.sessionPreset = preset
-		
-		// setup default camera device
-		let videoDevice: AVCaptureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
-		let videoInput: AVCaptureDeviceInput? = try? AVCaptureDeviceInput(device: videoDevice)
-		
-		if nil == videoInput {
-			return false
-		}
-		
-		if session.canAddInput(videoInput) {
-			session.addInput(videoInput)
-			activeVideoInput = videoInput
-		}
-		
-		let audioDevice: AVCaptureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeAudio)
-		let audioInput: AVCaptureDeviceInput? = try? AVCaptureDeviceInput(device: audioDevice)
-		
-		if nil == audioInput {
-			return false
-		}
-		
-		if session.canAddInput(audioInput) {
-			session.addInput(audioInput)
-		}
-		
-		imageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
-		
-		if session.canAddOutput(imageOutput) {
-			session.addOutput(imageOutput)
-		}
-		
-		if session.canAddOutput(movieOutput) {
-			session.addOutput(movieOutput)
-		}
-		
-		return true
-	}
-	
-	/**
-	* startSession
-	* Starts the capture session if it is not already running.
-	*/
-	public func startSession() {
-		if !session.running {
-			dispatch_async(queue) {
-				self.session.startRunning()
-			}
-		}
-	}
-	
-	/**
-	* stopSession
-	* Stops the capture session if it is already running.
-	*/
-	public func stopSession() {
-		if session.running {
-			dispatch_async(queue) {
-				self.session.stopRunning()
-			}
-		}
-	}
-	
-	/**
-	* cameraWithPosition
-	* @param		position: AVCaptureDevicePosition
-	* @return		An AVCaptureDevice optional.
-	*/
-	public func cameraWithPosition(position: AVCaptureDevicePosition) -> AVCaptureDevice? {
-		for device in AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo) {
-			if position == device.position {
-				return device as? AVCaptureDevice
-			}
-		}
-		return nil
-	}
-	
-	/**
-	* activeCamera
-	* @return		The active cameras video input device.
-	*/
-	public var activeCamera: AVCaptureDevice {
-		get {
-			return activeVideoInput!.device
-		}
-	}
-	
-	/**
-	* inactiveCamera
-	* @return		The inactive cameras video input device.
-	*/
-	public var inactiveCamera: AVCaptureDevice? {
-		get {
-			var device: AVCaptureDevice?
-			if 1 < cameraCount {
-				device = activeCamera.position == .Back ? cameraWithPosition(.Front) : cameraWithPosition(.Back)
-			}
-			return device
-		}
-	}
-	
-	/**
-	* canSwitchCameras
-	* Checks whether the camera can be switched. This would require at least two cameras.
-	* @return		A boolean of the result, true if yes, false otherwise.
-	*/
-	public var canSwitchCameras: Bool {
-		return 1 < cameraCount
-	}
-	
-	/**
-	* switchCamera
-	* If it is possible to switch cameras, then the camera will be switched from the opposite facing camera.
-	* @return		A boolean of the result, true if switched, false otherwise.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public func switchCamera() -> Bool {
-		if !canSwitchCameras {
-			return false
-		}
-		
-		let videoDevice: AVCaptureDevice? = inactiveCamera
-		let videoInput: AVCaptureDeviceInput? = try? AVCaptureDeviceInput(device: videoDevice)
-		
-		if nil == videoInput {
-			session.beginConfiguration()
-			session.removeInput(activeVideoInput)
-			
-			if session.canAddInput(videoInput) {
-				activeVideoInput = videoInput
-			} else {
-				session.addInput(activeVideoInput)
-			}
-			
-			session.commitConfiguration()
-		} else {
-			delegate?.captureDeviceConfigurationFailed?(self, error: nil)
-			return false
-		}
-		
-		return true
-	}
-	
-	/**
-	* cameraHasFlash
-	* Checks whether the camera supports flash.
-	* @return		A boolean of the result, true if yes, false otherwise.
-	*/
-	public var cameraHasFlash: Bool {
-		return activeCamera.hasFlash
-	}
-	
-	/**
-	* flashMode
-	* A mutator and accessor for the flashMode property.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public var flashMode: AVCaptureFlashMode {
-		get {
-			return activeCamera.flashMode
-		}
-		set(value) {
-			let device: AVCaptureDevice = activeCamera
-			if flashMode != device.flashMode && device.isFlashModeSupported(flashMode) {
-				var error: NSError?
-				do {
-					try device.lockForConfiguration()
-					device.flashMode = flashMode
-					device.unlockForConfiguration()
-				} catch let error1 as NSError {
-					error = error1
-					delegate?.captureDeviceConfigurationFailed?(self, error: error)
-				}
-			}
-		}
-	}
-	
-	/**
-	* cameraHasTorch
-	* Checks whether the device supports torch feature. 
-	* @return		A boolean of the result, true if yes, false otherwise.
-	*/
-	public var cameraHasTorch: Bool {
-		get {
-			return activeCamera.hasTorch
-		}
-	}
-	
-	/**
-	* torchMode
-	* A mutator and accessor for the torchMode property.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public var torchMode: AVCaptureTorchMode {
-		get {
-			return activeCamera.torchMode
-		}
-		set(value) {
-			let device: AVCaptureDevice = activeCamera
-			if torchMode != device.torchMode && device.isTorchModeSupported(torchMode) {
-				var error: NSError?
-				do {
-					try device.lockForConfiguration()
-					device.torchMode = torchMode
-					device.unlockForConfiguration()
-				} catch let error1 as NSError {
-					error = error1
-					delegate?.captureDeviceConfigurationFailed?(self, error: error)
-				}
-			}
-		}
-	}
-	
-	/**
-	* cameraSupportsTapToFocus
-	* Checks whether the device supports tap to focus.
-	* @return		A boolean of the result, true if yes, false otherwise.
-	*/
-	public var cameraSupportsTapToFocus: Bool {
-		get {
-			return activeCamera.focusPointOfInterestSupported
-		}
-	}
-	
-	/**
-	* focusAtpoint
-	* Sets the point to focus at on the screen.
-	* @param		point: CGPoint
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public func focusAtPoint(point: CGPoint) {
-		let device: AVCaptureDevice = activeCamera
-		if device.focusPointOfInterestSupported && device.isFocusModeSupported(.AutoFocus) {
-			var error: NSError?
-			do {
-				try device.lockForConfiguration()
-				device.focusPointOfInterest = point
-				device.focusMode = .AutoFocus
-				device.unlockForConfiguration()
-			} catch let error1 as NSError {
-				error = error1
-				delegate?.captureDeviceConfigurationFailed?(self, error: error)
-			}
-		}
-	}
-	
-	/**
-	* cameraSupportsTapToExpose
-	* Checks whether the device supports tap to expose.
-	* @return		A boolean of the result, true if yes, false otherwise.
-	*/
-	public var cameraSupportsTapToExpose: Bool {
-		get {
-			return activeCamera.exposurePointOfInterestSupported
-		}
-	}
-	
-	/**
-	* exposeAtPoint
-	* Sets a point for exposure.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public func exposeAtPoint(point: CGPoint) {
-		let device: AVCaptureDevice = activeCamera
-		let exposureMode: AVCaptureExposureMode = .ContinuousAutoExposure
-		
-		if device.exposurePointOfInterestSupported && device.isExposureModeSupported(exposureMode) {
-			var error: NSError?
-			do {
-				try device.lockForConfiguration()
-				device.exposurePointOfInterest = point
-				device.exposureMode = exposureMode
-				
-				if device.isExposureModeSupported(.Locked) {
-					device.addObserver(self, forKeyPath: "adjustingExposure", options: .New, context: &CaptureAdjustingExposureContext)
-				}
-				device.unlockForConfiguration()
-			} catch let error1 as NSError {
-				error = error1
-				delegate?.captureDeviceConfigurationFailed?(self, error: error)
-			}
-		}
-	}
-	
-	/**
-	* override to set observeValueForKeyPath and handle exposure observance.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	override public func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
-		if context == &CaptureAdjustingExposureContext {
-			let device: AVCaptureDevice = object as! AVCaptureDevice
-			
-			if device.adjustingExposure && device.isExposureModeSupported(.Locked) {
-				object!.removeObserver(self, forKeyPath: "adjustingExposure", context: &CaptureAdjustingExposureContext)
-				dispatch_async(queue) {
-					var error: NSError?
-					do {
-						try device.lockForConfiguration()
-						device.unlockForConfiguration()
-					} catch let e as NSError {
-						error = e
-						self.delegate?.captureDeviceConfigurationFailed?(self, error: error)
-					} catch {
-						fatalError()
-					}
-				}
-			} else {
-				super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
-			}
-		}
-	}
-	
-	/**
-	* resetFocusAndExposureModes
-	* Resets to default configuration for device focus and exposure mode.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public func resetFocusAndExposureModes() {
-		let device: AVCaptureDevice = activeCamera
-		
-		let exposureMode: AVCaptureExposureMode = .ContinuousAutoExposure
-		let canResetExposure: Bool = device.focusPointOfInterestSupported && device.isExposureModeSupported(exposureMode)
-		
-		let focusMode: AVCaptureFocusMode = .ContinuousAutoFocus
-		let canResetFocus: Bool = device.focusPointOfInterestSupported && device.isFocusModeSupported(focusMode)
-		
-		let centerPoint: CGPoint = CGPointMake(0.5, 0.5)
-		
-		var error: NSError?
-		do {
-			try device.lockForConfiguration()
-			if canResetFocus {
-				device.focusMode = focusMode
-				device.focusPointOfInterest = centerPoint
-			}
-			if canResetExposure {
-				device.exposureMode = exposureMode
-				device.exposurePointOfInterest = centerPoint
-			}
-			device.unlockForConfiguration()
-		} catch let error1 as NSError {
-			error = error1
-			delegate?.captureDeviceConfigurationFailed?(self, error: error)
-		}
-	}
-	
-	/**
-	* captureStillImage
-	* Captures the image and write the photo to the user's asset library.
-	* @delegate		If the success, the capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) is called.
-	* @delegate		If failure, capture(capture: Capture!, assetLibraryWriteFailed error: NSError!) is called.
-	*/
-	public func captureStillImage() {
-		let connection: AVCaptureConnection = imageOutput.connectionWithMediaType(AVMediaTypeVideo)
-		if connection.supportsVideoOrientation {
-			connection.videoOrientation = currentVideoOrientation
-		}
-		imageOutput.captureStillImageAsynchronouslyFromConnection(connection) { (sampleBuffer: CMSampleBufferRef?, error: NSError?) in
-			if nil == sampleBuffer {
-				self.delegate?.captureAsetLibraryWriteFailed?(self, error: error)
-			} else {
-				let imageData: NSData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
-				let image: UIImage = UIImage(data: imageData)!
-				self.writeImageToAssetsLibrary(image)
-			}
-		}
-	}
-	
-	/**
-	* isRecording
-	* Checkts whether the device is currently recording. 
-	* @return		A boolean of the result, true if yes, false otherwise.
-	*/
-	public var isRecording: Bool {
-		get {
-			return movieOutput.recording
-		}
-	}
-	
-	/**
-	* startRecording
-	* If the device is not currently recording, this starts the movie recording.
-	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
-	*/
-	public func startRecording() {
-		if !isRecording {
-			let connection: AVCaptureConnection = movieOutput.connectionWithMediaType(AVMediaTypeVideo)
-			if connection.supportsVideoOrientation {
-				connection.videoOrientation = currentVideoOrientation
-			}
-			if connection.supportsVideoStabilization {
-				connection.preferredVideoStabilizationMode = .Auto
-			}
-			
-			let device: AVCaptureDevice = activeCamera
-			
-			if device.smoothAutoFocusSupported {
-				var error: NSError?
-				do {
-					try device.lockForConfiguration()
-					device.smoothAutoFocusEnabled = false
-					device.unlockForConfiguration()
-				} catch let error1 as NSError {
-					error = error1
-					delegate?.captureDeviceConfigurationFailed?(self, error: error)
-				}
-			}
-			movieOutputURL = uniqueURL
-			movieOutput.startRecordingToOutputFileURL(movieOutputURL, recordingDelegate: self)
-		}
-	}
-	
-	/**
-	* stopRecording
-	* If the device is currently recoring, this stops the movie recording.
-	*/
-	public func stopRecording() {
-		if isRecording {
-			movieOutput.stopRecording()
-		}
-	}
-	
-	/**
-	* recordedDuration
-	* Retrieves the movie recorded duration.
-	* @return		A CMTime value.
-	*/
-	public var recordedDuration: CMTime {
-		get {
-			return movieOutput.recordedDuration
-		}
-	}
-	
-	/**
-	* currentVideoOrientation
-	* Retrieves the current orientation of the device.
-	* @return		A AVCaptureVideoOrientation value, [Portrait, LandscapeLeft, PortraitUpsideDown, LandscapeRight].
-	*/
-	public var currentVideoOrientation: AVCaptureVideoOrientation {
-		var orientation: AVCaptureVideoOrientation?
-		switch UIDevice.currentDevice().orientation {
-		case .Portrait:
-			orientation = .Portrait
-			break
-		case .LandscapeRight:
-			orientation = .LandscapeLeft
-			break
-		case .PortraitUpsideDown:
-			orientation = .PortraitUpsideDown
-			break
-		default:
-			orientation = .LandscapeRight
-		}
-		return orientation!
-	}
-	
-	/**
-	* uniqueURL
-	* A unique URL generated for the movie video.
-	* @return		An optional NSURL value.
-	*/
-	private var uniqueURL: NSURL? {
-		let fileManager: NSFileManager = NSFileManager.defaultManager()
-		let tempDirectoryTemplate: String = (NSTemporaryDirectory() as NSString).stringByAppendingPathComponent("FocusLibrary")
-		do {
-			try fileManager.createDirectoryAtPath(tempDirectoryTemplate, withIntermediateDirectories: true, attributes: nil)
-			return NSURL.fileURLWithPath(tempDirectoryTemplate + "/test.mov")
-		} catch {}
-		return nil
-	}
-	
-	/**
-	* postAssetLibraryNotification
-	* Fires an asynchronous call to the capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
-	* @param		image: UIImage!
-	* @delegate		An asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
-	*/
-	private func postAssetLibraryNotification(image: UIImage!) {
-		dispatch_async(queue) {
-			self.delegate?.capture?(self, assetLibraryDidWrite: image)
-		}
-	}
-	
-	/**
-	* writeImageToAssetsLibrary
-	* Writes the image file to the user's asset library.
-	* @param		image: UIImage!
-	* @delegate		If successful, an asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
-	* @delegate		If failure, capture(capture: Capture!, assetLibraryWriteFailed error: NSError!) is called.
-	*/
-	private func writeImageToAssetsLibrary(image: UIImage) {
-		let library: ALAssetsLibrary = ALAssetsLibrary()
-		library.writeImageToSavedPhotosAlbum(image.CGImage, orientation: ALAssetOrientation(rawValue: image.imageOrientation.rawValue)!) { (path: NSURL!, error: NSError?) -> Void in
-			if nil == error {
-				self.postAssetLibraryNotification(image)
-			} else {
-				self.delegate?.captureAsetLibraryWriteFailed?(self, error: error)
-			}
-		}
-	}
-	
-	/**
-	* writeVideoToAssetsLibrary
-	* Writes the video file to the user's asset library.
-	* @param		videoURL: NSURL!
-	* @delegate		If successful, an asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
-	* @delegate		If failure, capture(capture: Capture!, assetLibraryWriteFailed error: NSError!) is called.
-	*/
-	private func writeVideoToAssetsLibrary(videoURL: NSURL!) {
-		let library: ALAssetsLibrary = ALAssetsLibrary()
-		if library.videoAtPathIsCompatibleWithSavedPhotosAlbum(videoURL) {
-			library.writeVideoAtPathToSavedPhotosAlbum(videoURL) { (path: NSURL!, error: NSError?) in
-				if nil == error {
-					self.generateThumbnailForVideoAtURL(videoURL)
-				} else {
-					self.delegate?.captureAsetLibraryWriteFailed?(self, error: error)
-				}
-			}
-		}
-	}
-	
-	/**
-	* generateThumbnailForVideoAtURL
-	* Generates a thumbnail for the video URL specified.
-	* @param		videoURL: NSURL!
-	* @delegate		An asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
-	*/
-	private func generateThumbnailForVideoAtURL(videoURL: NSURL!) {
-		dispatch_async(queue) {
-			do {
-				let asset: AVAsset = AVAsset(URL: videoURL)
-				let imageGenerator: AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
-				imageGenerator.maximumSize = CGSizeMake(100, 0)
-				imageGenerator.appliesPreferredTrackTransform = true
-				
-				let imageRef: CGImageRef = try imageGenerator.copyCGImageAtTime(kCMTimeZero, actualTime: nil)
-				let image: UIImage = UIImage(CGImage: imageRef)
-				
+//public class Capture: NSObject, AVCaptureFileOutputRecordingDelegate {
+//	//
+//	//	:name:	activeVideoInput
+//	//	:description:	The video input that is currently active.
+//	//	
+//	private var activeVideoInput: AVCaptureDeviceInput?
+//	
+//	//
+//	//	:name:	imageOutput
+//	//	:description:	When the session is taking a photo, this is the output manager.
+//	//	
+//	private lazy var imageOutput: AVCaptureStillImageOutput = AVCaptureStillImageOutput()
+//	
+//	//
+//	//	:name:	movieOutput
+//	//	:description:	When the session is shooting a video, this is the output manager.
+//	//	
+//	private lazy var movieOutput: AVCaptureMovieFileOutput = AVCaptureMovieFileOutput()
+//	
+//	//
+//	//	:name:	movieOutputURL
+//	//	:description:	The output URL of the movie file.
+//	//	
+//	private var movieOutputURL: NSURL?
+//	
+//	//
+//	//	:name:	queue
+//	//	:description:	Async job queue.
+//	//	
+//	private lazy var queue: dispatch_queue_t = {
+//		return dispatch_queue_create("io.graphkit.Capture", nil)
+//	}()
+//	
+//	//
+//	//	:name:	CaptureAdjustingExposureContext
+//	//	:description:	Used for KVO observation context.
+//	//	
+//	public var CaptureAdjustingExposureContext: NSString?
+//	
+//	/**
+//	* cameraCount
+//	* The number of available cameras on the device.
+//	*/
+//	public var cameraCount: Int {
+//		return AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo).count
+//	}
+//	
+//	/**
+//	* session
+//	* An AVCaptureSession that manages all inputs and outputs in that session.
+//	*/
+//	public lazy var session: AVCaptureSession = AVCaptureSession()
+//	
+//	/**
+//	* delegate
+//	* An optional instance of CaptureDelegate to handle events that are triggered during various
+//	* stages in the session.
+//	*/
+//	public weak var delegate: CaptureDelegate?
+//	
+//	/**
+//	* prepareSession
+//	* A helper method that prepares the session with the various available inputs and outputs.
+//	* @param		preset: String, default: AVCaptureSessionPresetHigh
+//	* @return		A boolean value, true if successful, false otherwise.
+//	*/
+//	public func prepareSession(preset: String = AVCaptureSessionPresetHigh) -> Bool {
+//		session.sessionPreset = preset
+//		
+//		// setup default camera device
+//		let videoDevice: AVCaptureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
+//		let videoInput: AVCaptureDeviceInput? = try? AVCaptureDeviceInput(device: videoDevice)
+//		
+//		if nil == videoInput {
+//			return false
+//		}
+//		
+//		if session.canAddInput(videoInput) {
+//			session.addInput(videoInput)
+//			activeVideoInput = videoInput
+//		}
+//		
+//		let audioDevice: AVCaptureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeAudio)
+//		let audioInput: AVCaptureDeviceInput? = try? AVCaptureDeviceInput(device: audioDevice)
+//		
+//		if nil == audioInput {
+//			return false
+//		}
+//		
+//		if session.canAddInput(audioInput) {
+//			session.addInput(audioInput)
+//		}
+//		
+//		imageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
+//		
+//		if session.canAddOutput(imageOutput) {
+//			session.addOutput(imageOutput)
+//		}
+//		
+//		if session.canAddOutput(movieOutput) {
+//			session.addOutput(movieOutput)
+//		}
+//		
+//		return true
+//	}
+//	
+//	/**
+//	* startSession
+//	* Starts the capture session if it is not already running.
+//	*/
+//	public func startSession() {
+//		if !session.running {
+//			dispatch_async(queue) {
+//				self.session.startRunning()
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* stopSession
+//	* Stops the capture session if it is already running.
+//	*/
+//	public func stopSession() {
+//		if session.running {
+//			dispatch_async(queue) {
+//				self.session.stopRunning()
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* cameraWithPosition
+//	* @param		position: AVCaptureDevicePosition
+//	* @return		An AVCaptureDevice optional.
+//	*/
+//	public func cameraWithPosition(position: AVCaptureDevicePosition) -> AVCaptureDevice? {
+//		for device in AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo) {
+//			if position == device.position {
+//				return device as? AVCaptureDevice
+//			}
+//		}
+//		return nil
+//	}
+//	
+//	/**
+//	* activeCamera
+//	* @return		The active cameras video input device.
+//	*/
+//	public var activeCamera: AVCaptureDevice {
+//		get {
+//			return activeVideoInput!.device
+//		}
+//	}
+//	
+//	/**
+//	* inactiveCamera
+//	* @return		The inactive cameras video input device.
+//	*/
+//	public var inactiveCamera: AVCaptureDevice? {
+//		get {
+//			var device: AVCaptureDevice?
+//			if 1 < cameraCount {
+//				device = activeCamera.position == .Back ? cameraWithPosition(.Front) : cameraWithPosition(.Back)
+//			}
+//			return device
+//		}
+//	}
+//	
+//	/**
+//	* canSwitchCameras
+//	* Checks whether the camera can be switched. This would require at least two cameras.
+//	* @return		A boolean of the result, true if yes, false otherwise.
+//	*/
+//	public var canSwitchCameras: Bool {
+//		return 1 < cameraCount
+//	}
+//	
+//	/**
+//	* switchCamera
+//	* If it is possible to switch cameras, then the camera will be switched from the opposite facing camera.
+//	* @return		A boolean of the result, true if switched, false otherwise.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public func switchCamera() -> Bool {
+//		if !canSwitchCameras {
+//			return false
+//		}
+//		
+//		let videoDevice: AVCaptureDevice? = inactiveCamera
+//		let videoInput: AVCaptureDeviceInput? = try? AVCaptureDeviceInput(device: videoDevice)
+//		
+//		if nil == videoInput {
+//			session.beginConfiguration()
+//			session.removeInput(activeVideoInput)
+//			
+//			if session.canAddInput(videoInput) {
+//				activeVideoInput = videoInput
+//			} else {
+//				session.addInput(activeVideoInput)
+//			}
+//			
+//			session.commitConfiguration()
+//		} else {
+//			delegate?.captureDeviceConfigurationFailed?(self, error: nil)
+//			return false
+//		}
+//		
+//		return true
+//	}
+//	
+//	/**
+//	* cameraHasFlash
+//	* Checks whether the camera supports flash.
+//	* @return		A boolean of the result, true if yes, false otherwise.
+//	*/
+//	public var cameraHasFlash: Bool {
+//		return activeCamera.hasFlash
+//	}
+//	
+//	/**
+//	* flashMode
+//	* A mutator and accessor for the flashMode property.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public var flashMode: AVCaptureFlashMode {
+//		get {
+//			return activeCamera.flashMode
+//		}
+//		set(value) {
+//			let device: AVCaptureDevice = activeCamera
+//			if flashMode != device.flashMode && device.isFlashModeSupported(flashMode) {
+//				var error: NSError?
+//				do {
+//					try device.lockForConfiguration()
+//					device.flashMode = flashMode
+//					device.unlockForConfiguration()
+//				} catch let error1 as NSError {
+//					error = error1
+//					delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//				}
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* cameraHasTorch
+//	* Checks whether the device supports torch feature. 
+//	* @return		A boolean of the result, true if yes, false otherwise.
+//	*/
+//	public var cameraHasTorch: Bool {
+//		get {
+//			return activeCamera.hasTorch
+//		}
+//	}
+//	
+//	/**
+//	* torchMode
+//	* A mutator and accessor for the torchMode property.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public var torchMode: AVCaptureTorchMode {
+//		get {
+//			return activeCamera.torchMode
+//		}
+//		set(value) {
+//			let device: AVCaptureDevice = activeCamera
+//			if torchMode != device.torchMode && device.isTorchModeSupported(torchMode) {
+//				var error: NSError?
+//				do {
+//					try device.lockForConfiguration()
+//					device.torchMode = torchMode
+//					device.unlockForConfiguration()
+//				} catch let error1 as NSError {
+//					error = error1
+//					delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//				}
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* cameraSupportsTapToFocus
+//	* Checks whether the device supports tap to focus.
+//	* @return		A boolean of the result, true if yes, false otherwise.
+//	*/
+//	public var cameraSupportsTapToFocus: Bool {
+//		get {
+//			return activeCamera.focusPointOfInterestSupported
+//		}
+//	}
+//	
+//	/**
+//	* focusAtpoint
+//	* Sets the point to focus at on the screen.
+//	* @param		point: CGPoint
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public func focusAtPoint(point: CGPoint) {
+//		let device: AVCaptureDevice = activeCamera
+//		if device.focusPointOfInterestSupported && device.isFocusModeSupported(.AutoFocus) {
+//			var error: NSError?
+//			do {
+//				try device.lockForConfiguration()
+//				device.focusPointOfInterest = point
+//				device.focusMode = .AutoFocus
+//				device.unlockForConfiguration()
+//			} catch let error1 as NSError {
+//				error = error1
+//				delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* cameraSupportsTapToExpose
+//	* Checks whether the device supports tap to expose.
+//	* @return		A boolean of the result, true if yes, false otherwise.
+//	*/
+//	public var cameraSupportsTapToExpose: Bool {
+//		get {
+//			return activeCamera.exposurePointOfInterestSupported
+//		}
+//	}
+//	
+//	/**
+//	* exposeAtPoint
+//	* Sets a point for exposure.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public func exposeAtPoint(point: CGPoint) {
+//		let device: AVCaptureDevice = activeCamera
+//		let exposureMode: AVCaptureExposureMode = .ContinuousAutoExposure
+//		
+//		if device.exposurePointOfInterestSupported && device.isExposureModeSupported(exposureMode) {
+//			var error: NSError?
+//			do {
+//				try device.lockForConfiguration()
+//				device.exposurePointOfInterest = point
+//				device.exposureMode = exposureMode
+//				
+//				if device.isExposureModeSupported(.Locked) {
+//					device.addObserver(self, forKeyPath: "adjustingExposure", options: .New, context: &CaptureAdjustingExposureContext)
+//				}
+//				device.unlockForConfiguration()
+//			} catch let error1 as NSError {
+//				error = error1
+//				delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* override to set observeValueForKeyPath and handle exposure observance.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	override public func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {
+//		if context == &CaptureAdjustingExposureContext {
+//			let device: AVCaptureDevice = object as! AVCaptureDevice
+//			
+//			if device.adjustingExposure && device.isExposureModeSupported(.Locked) {
+//				object!.removeObserver(self, forKeyPath: "adjustingExposure", context: &CaptureAdjustingExposureContext)
+//				dispatch_async(queue) {
+//					var error: NSError?
+//					do {
+//						try device.lockForConfiguration()
+//						device.unlockForConfiguration()
+//					} catch let e as NSError {
+//						error = e
+//						self.delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//					} catch {
+//						fatalError()
+//					}
+//				}
+//			} else {
+//				super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* resetFocusAndExposureModes
+//	* Resets to default configuration for device focus and exposure mode.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public func resetFocusAndExposureModes() {
+//		let device: AVCaptureDevice = activeCamera
+//		
+//		let exposureMode: AVCaptureExposureMode = .ContinuousAutoExposure
+//		let canResetExposure: Bool = device.focusPointOfInterestSupported && device.isExposureModeSupported(exposureMode)
+//		
+//		let focusMode: AVCaptureFocusMode = .ContinuousAutoFocus
+//		let canResetFocus: Bool = device.focusPointOfInterestSupported && device.isFocusModeSupported(focusMode)
+//		
+//		let centerPoint: CGPoint = CGPointMake(0.5, 0.5)
+//		
+//		var error: NSError?
+//		do {
+//			try device.lockForConfiguration()
+//			if canResetFocus {
+//				device.focusMode = focusMode
+//				device.focusPointOfInterest = centerPoint
+//			}
+//			if canResetExposure {
+//				device.exposureMode = exposureMode
+//				device.exposurePointOfInterest = centerPoint
+//			}
+//			device.unlockForConfiguration()
+//		} catch let error1 as NSError {
+//			error = error1
+//			delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//		}
+//	}
+//	
+//	/**
+//	* captureStillImage
+//	* Captures the image and write the photo to the user's asset library.
+//	* @delegate		If the success, the capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) is called.
+//	* @delegate		If failure, capture(capture: Capture!, assetLibraryWriteFailed error: NSError!) is called.
+//	*/
+//	public func captureStillImage() {
+//		let connection: AVCaptureConnection = imageOutput.connectionWithMediaType(AVMediaTypeVideo)
+//		if connection.supportsVideoOrientation {
+//			connection.videoOrientation = currentVideoOrientation
+//		}
+//		imageOutput.captureStillImageAsynchronouslyFromConnection(connection) { (sampleBuffer: CMSampleBufferRef?, error: NSError?) in
+//			if nil == sampleBuffer {
+//				self.delegate?.captureAsetLibraryWriteFailed?(self, error: error)
+//			} else {
+//				let imageData: NSData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
+//				let image: UIImage = UIImage(data: imageData)!
+//				self.writeImageToAssetsLibrary(image)
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* isRecording
+//	* Checkts whether the device is currently recording. 
+//	* @return		A boolean of the result, true if yes, false otherwise.
+//	*/
+//	public var isRecording: Bool {
+//		get {
+//			return movieOutput.recording
+//		}
+//	}
+//	
+//	/**
+//	* startRecording
+//	* If the device is not currently recording, this starts the movie recording.
+//	* @delegate		If the configuration fails, the capture(capture: Capture!, deviceConfigurationFailed error: NSError!) is called.
+//	*/
+//	public func startRecording() {
+//		if !isRecording {
+//			let connection: AVCaptureConnection = movieOutput.connectionWithMediaType(AVMediaTypeVideo)
+//			if connection.supportsVideoOrientation {
+//				connection.videoOrientation = currentVideoOrientation
+//			}
+//			if connection.supportsVideoStabilization {
+//				connection.preferredVideoStabilizationMode = .Auto
+//			}
+//			
+//			let device: AVCaptureDevice = activeCamera
+//			
+//			if device.smoothAutoFocusSupported {
+//				var error: NSError?
+//				do {
+//					try device.lockForConfiguration()
+//					device.smoothAutoFocusEnabled = false
+//					device.unlockForConfiguration()
+//				} catch let error1 as NSError {
+//					error = error1
+//					delegate?.captureDeviceConfigurationFailed?(self, error: error)
+//				}
+//			}
+//			movieOutputURL = uniqueURL
+//			movieOutput.startRecordingToOutputFileURL(movieOutputURL, recordingDelegate: self)
+//		}
+//	}
+//	
+//	/**
+//	* stopRecording
+//	* If the device is currently recoring, this stops the movie recording.
+//	*/
+//	public func stopRecording() {
+//		if isRecording {
+//			movieOutput.stopRecording()
+//		}
+//	}
+//	
+//	/**
+//	* recordedDuration
+//	* Retrieves the movie recorded duration.
+//	* @return		A CMTime value.
+//	*/
+//	public var recordedDuration: CMTime {
+//		get {
+//			return movieOutput.recordedDuration
+//		}
+//	}
+//	
+//	/**
+//	* currentVideoOrientation
+//	* Retrieves the current orientation of the device.
+//	* @return		A AVCaptureVideoOrientation value, [Portrait, LandscapeLeft, PortraitUpsideDown, LandscapeRight].
+//	*/
+//	public var currentVideoOrientation: AVCaptureVideoOrientation {
+//		var orientation: AVCaptureVideoOrientation?
+//		switch UIDevice.currentDevice().orientation {
+//		case .Portrait:
+//			orientation = .Portrait
+//			break
+//		case .LandscapeRight:
+//			orientation = .LandscapeLeft
+//			break
+//		case .PortraitUpsideDown:
+//			orientation = .PortraitUpsideDown
+//			break
+//		default:
+//			orientation = .LandscapeRight
+//		}
+//		return orientation!
+//	}
+//	
+//	/**
+//	* uniqueURL
+//	* A unique URL generated for the movie video.
+//	* @return		An optional NSURL value.
+//	*/
+//	private var uniqueURL: NSURL? {
+//		let fileManager: NSFileManager = NSFileManager.defaultManager()
+//		let tempDirectoryTemplate: String = (NSTemporaryDirectory() as NSString).stringByAppendingPathComponent("FocusLibrary")
+//		do {
+//			try fileManager.createDirectoryAtPath(tempDirectoryTemplate, withIntermediateDirectories: true, attributes: nil)
+//			return NSURL.fileURLWithPath(tempDirectoryTemplate + "/test.mov")
+//		} catch {}
+//		return nil
+//	}
+//	
+//	/**
+//	* postAssetLibraryNotification
+//	* Fires an asynchronous call to the capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
+//	* @param		image: UIImage!
+//	* @delegate		An asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
+//	*/
+//	private func postAssetLibraryNotification(image: UIImage!) {
+//		dispatch_async(queue) {
+//			self.delegate?.capture?(self, assetLibraryDidWrite: image)
+//		}
+//	}
+//	
+//	/**
+//	* writeImageToAssetsLibrary
+//	* Writes the image file to the user's asset library.
+//	* @param		image: UIImage!
+//	* @delegate		If successful, an asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
+//	* @delegate		If failure, capture(capture: Capture!, assetLibraryWriteFailed error: NSError!) is called.
+//	*/
+//	private func writeImageToAssetsLibrary(image: UIImage) {
+//		let library: ALAssetsLibrary = ALAssetsLibrary()
+//		library.writeImageToSavedPhotosAlbum(image.CGImage, orientation: ALAssetOrientation(rawValue: image.imageOrientation.rawValue)!) { (path: NSURL!, error: NSError?) -> Void in
+//			if nil == error {
+//				self.postAssetLibraryNotification(image)
+//			} else {
+//				self.delegate?.captureAsetLibraryWriteFailed?(self, error: error)
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* writeVideoToAssetsLibrary
+//	* Writes the video file to the user's asset library.
+//	* @param		videoURL: NSURL!
+//	* @delegate		If successful, an asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
+//	* @delegate		If failure, capture(capture: Capture!, assetLibraryWriteFailed error: NSError!) is called.
+//	*/
+//	private func writeVideoToAssetsLibrary(videoURL: NSURL!) {
+//		let library: ALAssetsLibrary = ALAssetsLibrary()
+//		if library.videoAtPathIsCompatibleWithSavedPhotosAlbum(videoURL) {
+//			library.writeVideoAtPathToSavedPhotosAlbum(videoURL) { (path: NSURL!, error: NSError?) in
+//				if nil == error {
+//					self.generateThumbnailForVideoAtURL(videoURL)
+//				} else {
+//					self.delegate?.captureAsetLibraryWriteFailed?(self, error: error)
+//				}
+//			}
+//		}
+//	}
+//	
+//	/**
+//	* generateThumbnailForVideoAtURL
+//	* Generates a thumbnail for the video URL specified.
+//	* @param		videoURL: NSURL!
+//	* @delegate		An asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
+//	*/
+//	private func generateThumbnailForVideoAtURL(videoURL: NSURL!) {
+//		dispatch_async(queue) {
+//			do {
+//				let asset: AVAsset = AVAsset(URL: videoURL)
+//				let imageGenerator: AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
+//				imageGenerator.maximumSize = CGSizeMake(100, 0)
+//				imageGenerator.appliesPreferredTrackTransform = true
+//				
+//				let imageRef: CGImageRef = try imageGenerator.copyCGImageAtTime(kCMTimeZero, actualTime: nil)
+//				let image: UIImage = UIImage(CGImage: imageRef)
+//				
+//				dispatch_async(dispatch_get_main_queue()) {
+//					self.postAssetLibraryNotification(image)
+//				}
+//			} catch {}
+//		}
+//	}
+//	
+//	/**
+//	* delegate method for capturing video file.
+//	* @delegate		If successful, an asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
+//	* @delegate		If failure, capture(capture: Capture!, mediaCaptureFailed error: NSError!) is called.
+//	*/
+//	public func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!) {
+//		if nil == error {
+//			writeVideoToAssetsLibrary(movieOutputURL!.copy() as! NSURL)
+//		} else {
+//			delegate?.captureMediaCaptureFailed?(self, error: error)
+//		}
+//		movieOutputURL = nil
+//	}
+//}
\ No newline at end of file
-				dispatch_async(dispatch_get_main_queue()) {
-					self.postAssetLibraryNotification(image)
-				}
-			} catch {}
-		}
-	}
-	
-	/**
-	* delegate method for capturing video file.
-	* @delegate		If successful, an asynchronous call to capture(capture: Capture!, assetLibraryDidWrite image: UIImage!) delegate.
-	* @delegate		If failure, capture(capture: Capture!, mediaCaptureFailed error: NSError!) is called.
-	*/
-	public func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!) {
-		if nil == error {
-			writeVideoToAssetsLibrary(movieOutputURL!.copy() as! NSURL)
-		} else {
-			delegate?.captureMediaCaptureFailed?(self, error: error)
-		}
-		movieOutputURL = nil
-	}
-}
\ No newline at end of file

Source/CapturePreview.swift

+////
+//// Copyright (C) 2015 GraphKit, Inc. <http://graphkit.io> and other GraphKit contributors.
+////
+//// This program is free software: you can redistribute it and/or modify
+//// it under the terms of the GNU Affero General Public License as published
+//// by the Free Software Foundation, either version 3 of the License, or
+//// (at your option) any later version.
+////
+//// This program is distributed in the hope that it will be useful,
+//// but WITHOUT ANY WARRANTY; without even the implied warranty of
+//// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//// GNU Affero General Public License for more details.
+////
+//// You should have received a copy of the GNU Affero General Public License
+//// along with this program located at the root of the software package
+//// in a file called LICENSE.  If not, see <http://www.gnu.org/licenses/>.
+////
 //
 //
-// Copyright (C) 2015 GraphKit, Inc. <http://graphkit.io> and other GraphKit contributors.
+//import UIKit
+//import AVFoundation
 //
 //
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published
-// by the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
+//@objc(PreviewDelegate)
+//public protocol PreviewDelegate {
+//	optional func previewTappedToFocusAt(preview: Preview, point: CGPoint)
+//	optional func previewTappedToExposeAt(preview: Preview, point: CGPoint)
+//	optional func previewTappedToReset(preview: Preview, focus: UIView, exposure: UIView)
+//}
 //
 //
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program located at the root of the software package
-// in a file called LICENSE.  If not, see <http://www.gnu.org/licenses/>.
-//
-
-import UIKit
-import AVFoundation
-
-@objc(PreviewDelegate)
-public protocol PreviewDelegate {
-	optional func previewTappedToFocusAt(preview: Preview, point: CGPoint)
-	optional func previewTappedToExposeAt(preview: Preview, point: CGPoint)
-	optional func previewTappedToReset(preview: Preview, focus: UIView, exposure: UIView)
-}
-
-public class Preview: UIView {
-	/**
-		:name:	boxBounds
-		:description:	A static property that sets the initial size of the focusBox and exposureBox properties.
-	*/
-	static public var boxBounds: CGRect = CGRectMake(0, 0, 150, 150)
-	
-	/**
-		:name:	delegate
-		:description:	An optional instance of PreviewDelegate to handle events that are triggered during various
-		stages of engagement.
-	*/
-	public weak var delegate: PreviewDelegate?
-	
-	/**
-		:name:	tapToFocusEnabled
-		:description:	A mutator and accessor that enables and disables tap to focus gesture.
-	*/
-	public var tapToFocusEnabled: Bool {
-		get {
-			return singleTapRecognizer!.enabled
-		}
-		set(value) {
-			singleTapRecognizer!.enabled = value
-		}
-	}
-	
-	/**
-		:name:	tapToExposeEnabled
-		:description:	A mutator and accessor that enables and disables tap to expose gesture.
-	*/
-	public var tapToExposeEnabled: Bool {
-		get {
-			return doubleTapRecognizer!.enabled
-		}
-		set(value) {
-			doubleTapRecognizer!.enabled = value
-		}
-	}
-	
-	//
-	//	override for layerClass
-	//
-	override public class func layerClass() -> AnyClass {
-		return AVCaptureVideoPreviewLayer.self
-	}
-	
-	/**
-		:name:	session
-		:description:	A mutator and accessor for the preview AVCaptureSession value.
-	*/
-	public var session: AVCaptureSession {
-		get {
-			return (layer as! AVCaptureVideoPreviewLayer).session
-		}
-		set(value) {
-			(layer as! AVCaptureVideoPreviewLayer).session = value
-		}
-	}
-	
-	/**
-		:name:	focusBox
-		:description:	An optional UIView for the focusBox animation. This is used when the
-		tapToFocusEnabled property is set to true.
-	*/
-	public var focusBox: UIView?
-	
-	/**
-		:name:	exposureBox
-		:description:	An optional UIView for the exposureBox animation. This is used when the
-		tapToExposeEnabled property is set to true.
-	*/
-	public var exposureBox: UIView?
-	
-	//
-	//	:name:	singleTapRecognizer
-	//	:description:	Gesture recognizer for single tap.
-	//
-	private var singleTapRecognizer: UITapGestureRecognizer?
-	
-	//
-	//	:name:	doubleTapRecognizer
-	//	:description:	Gesture recognizer for double tap.
-	//
-	private var doubleTapRecognizer: UITapGestureRecognizer?
-	
-	//
-	//	:name:	doubleDoubleTapRecognizer
-	//	:description:	Gesture recognizer for double/double tap.
-	//
-	private var doubleDoubleTapRecognizer: UITapGestureRecognizer?
-	
-	required public init?(coder aDecoder: NSCoder) {
-		super.init(coder: aDecoder)
-		prepareView()
-	}
-	
-	public override init(frame: CGRect) {
-		super.init(frame: frame)
-		prepareView()
-	}
-	
-	public init() {
-		super.init(frame: CGRectZero)
-		translatesAutoresizingMaskIntoConstraints = false
-		prepareView()
-	}
-	
-	//
-	//	:name:	handleSingleTap
-	//
-	internal func handleSingleTap(recognizer: UIGestureRecognizer) {
-		let point: CGPoint = recognizer.locationInView(self)
-		runBoxAnimationOnView(focusBox, point: point)
-		delegate?.previewTappedToFocusAt?(self, point: captureDevicePointForPoint(point))
-	}
-	
-	//
-	//	:name:	handleDoubleTap
-	//	
-	internal func handleDoubleTap(recognizer: UIGestureRecognizer) {
-		let point: CGPoint = recognizer.locationInView(self)
-		runBoxAnimationOnView(exposureBox, point: point)
-		delegate?.previewTappedToExposeAt?(self, point: captureDevicePointForPoint(point))
-	}
-	
-	//
-	//	:name:	handleDoubleDoubleTap
-	//	
-	internal func handleDoubleDoubleTap(recognizer: UIGestureRecognizer) {
-		runResetAnimation()
-	}
-	
-	//
-	//	:name:	prepareView
-	//	:description:	Common setup for view.
-	//	
-	private func prepareView() {
-		let captureLayer: AVCaptureVideoPreviewLayer = layer as! AVCaptureVideoPreviewLayer
-		captureLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
-		
-		singleTapRecognizer = UITapGestureRecognizer(target: self, action: "handleSingleTap:")
-		singleTapRecognizer!.numberOfTapsRequired = 1
-		
-		doubleTapRecognizer = UITapGestureRecognizer(target: self, action: "handleDoubleTap:")
-		doubleTapRecognizer!.numberOfTapsRequired = 2
-		
-		doubleDoubleTapRecognizer = UITapGestureRecognizer(target: self, action: "handleDoubleDoubleTap:")
-		doubleDoubleTapRecognizer!.numberOfTapsRequired = 2
-		doubleDoubleTapRecognizer!.numberOfTouchesRequired = 2
-		
-		addGestureRecognizer(singleTapRecognizer!)
-		addGestureRecognizer(doubleTapRecognizer!)
-		addGestureRecognizer(doubleDoubleTapRecognizer!)
-		singleTapRecognizer!.requireGestureRecognizerToFail(doubleTapRecognizer!)
-		
-		focusBox = viewWithColor(.redColor())
-		exposureBox = viewWithColor(.blueColor())
-		addSubview(focusBox!)
-		addSubview(exposureBox!)
-	}
-	
-	//
-	//	:name:	viewWithColor
-	//	:description:	Initializes a UIView with a set UIColor.
-	//	
-	private func viewWithColor(color: UIColor) -> UIView {
-		let view: UIView = UIView(frame: Preview.boxBounds)
-		view.backgroundColor = MaterialTheme.clear.color
-		view.layer.borderColor = color.CGColor
-		view.layer.borderWidth = 5
-		view.hidden = true
-		return view
-	}
-	
-	//
-	//	:name:	runBoxAnimationOnView
-	//	:description:	Runs the animation used for focusBox and exposureBox on single and double
-	//	taps respectively at a given point.
-	//	
-	private func runBoxAnimationOnView(view: UIView!, point: CGPoint) {
-		view.center = point
-		view.hidden = false
-		UIView.animateWithDuration(0.15, delay: 0, options: .CurveEaseInOut, animations: { _ in
-			view.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1)
-		}) { _ in
-			let delayInSeconds: Double = 0.5
-			let popTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
-			dispatch_after(popTime, dispatch_get_main_queue()) {
-				view.hidden = true
-				view.transform = CGAffineTransformIdentity
-			}
-		}
-	}
-	
-	//
-	//	:name:	captureDevicePointForPoint
-	//	:description:	Interprets the correct point from touch to preview layer.
-	//	
-	private func captureDevicePointForPoint(point: CGPoint) -> CGPoint {
-		let previewLayer: AVCaptureVideoPreviewLayer = layer as! AVCaptureVideoPreviewLayer
-		return previewLayer.captureDevicePointOfInterestForPoint(point)
-	}
-	
-	//
-	//	:name:	runResetAnimation
-	//	:description:	Executes the reset animation for focus and exposure.
-	//	
-	private func runResetAnimation() {
-		if !tapToFocusEnabled && !tapToExposeEnabled {
-			return
-		}
-		
-		let previewLayer: AVCaptureVideoPreviewLayer = layer as! AVCaptureVideoPreviewLayer
-		let centerPoint: CGPoint = previewLayer.pointForCaptureDevicePointOfInterest(CGPointMake(0.5, 0.5))
-		focusBox!.center = centerPoint
-		exposureBox!.center = centerPoint
-		exposureBox!.transform = CGAffineTransformMakeScale(1.2, 1.2)
-		focusBox!.hidden = false
-		exposureBox!.hidden = false
-		
-		UIView.animateWithDuration(0.15, delay: 0, options: .CurveEaseInOut, animations: { _ in
-			self.focusBox!.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1)
-			self.exposureBox!.layer.transform = CATransform3DMakeScale(0.7, 0.7, 1)
-		}) { _ in
-			let delayInSeconds: Double = 0.5
-			let popTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
-			dispatch_after(popTime, dispatch_get_main_queue()) {
-				self.focusBox!.hidden = true
-				self.exposureBox!.hidden = true
-				self.focusBox!.transform = CGAffineTransformIdentity
-				self.exposureBox!.transform = CGAffineTransformIdentity
-				self.delegate?.previewTappedToReset?(self, focus: self.focusBox!, exposure: self.exposureBox!)
-			}
-		}
-	}
-}
+//public class Preview: UIView {
+//	/**
+//		:name:	boxBounds
+//		:description:	A static property that sets the initial size of the focusBox and exposureBox properties.
+//	*/
+//	static public var boxBounds: CGRect = CGRectMake(0, 0, 150, 150)
+//	
+//	/**
+//		:name:	delegate
+//		:description:	An optional instance of PreviewDelegate to handle events that are triggered during various
+//		stages of engagement.
+//	*/
+//	public weak var delegate: PreviewDelegate?
+//	
+//	/**
+//		:name:	tapToFocusEnabled
+//		:description:	A mutator and accessor that enables and disables tap to focus gesture.
+//	*/
+//	public var tapToFocusEnabled: Bool {
+//		get {
+//			return singleTapRecognizer!.enabled
+//		}
+//		set(value) {
+//			singleTapRecognizer!.enabled = value
+//		}
+//	}
+//	
+//	/**
+//		:name:	tapToExposeEnabled
+//		:description:	A mutator and accessor that enables and disables tap to expose gesture.
+//	*/
+//	public var tapToExposeEnabled: Bool {
+//		get {
+//			return doubleTapRecognizer!.enabled
+//		}
+//		set(value) {
+//			doubleTapRecognizer!.enabled = value
+//		}
+//	}
+//	
+//	//
+//	//	override for layerClass
+//	//
+//	override public class func layerClass() -> AnyClass {
+//		return AVCaptureVideoPreviewLayer.self
+//	}
+//	
+//	/**
+//		:name:	session
+//		:description:	A mutator and accessor for the preview AVCaptureSession value.
+//	*/
+//	public var session: AVCaptureSession {
+//		get {
+//			return (layer as! AVCaptureVideoPreviewLayer).session
+//		}
+//		set(value) {
+//			(layer as! AVCaptureVideoPreviewLayer).session = value
+//		}
+//	}
+//	
+//	/**
+//		:name:	focusBox
+//		:description:	An optional UIView for the focusBox animation. This is used when the
+//		tapToFocusEnabled property is set to true.
+//	*/
+//	public var focusBox: UIView?
+//	
+//	/**
+//		:name:	exposureBox
+//		:description:	An optional UIView for the exposureBox animation. This is used when the
+//		tapToExposeEnabled property is set to true.
+//	*/
+//	public var exposureBox: UIView?
+//	
+//	//
+//	//	:name:	singleTapRecognizer
+//	//	:description:	Gesture recognizer for single tap.
+//	//
+//	private var singleTapRecognizer: UITapGestureRecognizer?
+//	
+//	//
+//	//	:name:	doubleTapRecognizer
+//	//	:description:	Gesture recognizer for double tap.
+//	//
+//	private var doubleTapRecognizer: UITapGestureRecognizer?
+//	
+//	//
+//	//	:name:	doubleDoubleTapRecognizer
+//	//	:description:	Gesture recognizer for double/double tap.
+//	//
+//	private var doubleDoubleTapRecognizer: UITapGestureRecognizer?
+//	
+//	required public init?(coder aDecoder: NSCoder) {
+//		super.init(coder: aDecoder)
+//		prepareView()
+//	}
+//	
+//	public override init(frame: CGRect) {
+//		super.init(frame: frame)
+//		prepareView()
+//	}
+//	
+//	public init() {
+//		super.init(frame: CGRectZero)
+//		translatesAutoresizingMaskIntoConstraints = false
+//		prepareView()
+//	}
+//	
+//	//
+//	//	:name:	handleSingleTap
+//	//
+//	internal func handleSingleTap(recognizer: UIGestureRecognizer) {
+//		let point: CGPoint = recognizer.locationInView(self)
+//		runBoxAnimationOnView(focusBox, point: point)
+//		delegate?.previewTappedToFocusAt?(self, point: captureDevicePointForPoint(point))
+//	}
+//	
+//	//
+//	//	:name:	handleDoubleTap
+//	//	
+//	internal func handleDoubleTap(recognizer: UIGestureRecognizer) {
+//		let point: CGPoint = recognizer.locationInView(self)
+//		runBoxAnimationOnView(exposureBox, point: point)
+//		delegate?.previewTappedToExposeAt?(self, point: captureDevicePointForPoint(point))
+//	}
+//	
+//	//
+//	//	:name:	handleDoubleDoubleTap
+//	//	
+//	internal func handleDoubleDoubleTap(recognizer: UIGestureRecognizer) {
+//		runResetAnimation()
+//	}
+//	
+//	//
+//	//	:name:	prepareView
+//	//	:description:	Common setup for view.
+//	//	
+//	private func prepareView() {
+//		let captureLayer: AVCaptureVideoPreviewLayer = layer as! AVCaptureVideoPreviewLayer
+//		captureLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
+//		
+//		singleTapRecognizer = UITapGestureRecognizer(target: self, action: "handleSingleTap:")
+//		singleTapRecognizer!.numberOfTapsRequired = 1
+//		
+//		doubleTapRecognizer = UITapGestureRecognizer(target: self, action: "handleDoubleTap:")
+//		doubleTapRecognizer!.numberOfTapsRequired = 2
+//		
+//		doubleDoubleTapRecognizer = UITapGestureRecognizer(target: self, action: "handleDoubleDoubleTap:")
+//		doubleDoubleTapRecognizer!.numberOfTapsRequired = 2
+//		doubleDoubleTapRecognizer!.numberOfTouchesRequired = 2
+//		
+//		addGestureRecognizer(singleTapRecognizer!)
+//		addGestureRecognizer(doubleTapRecognizer!)
+//		addGestureRecognizer(doubleDoubleTapRecognizer!)
+//		singleTapRecognizer!.requireGestureRecognizerToFail(doubleTapRecognizer!)
+//		
+//		focusBox = viewWithColor(.redColor())
+//		exposureBox = viewWithColor(.blueColor())
+//		addSubview(focusBox!)
+//		addSubview(exposureBox!)
+//	}
+//	
+//	//
+//	//	:name:	viewWithColor
+//	//	:description:	Initializes a UIView with a set UIColor.
+//	//	
+//	private func viewWithColor(color: UIColor) -> UIView {
+//		let view: UIView = UIView(frame: Preview.boxBounds)
+//		view.backgroundColor = MaterialTheme.clear.color
+//		view.layer.borderColor = color.CGColor
+//		view.layer.borderWidth = 5
+//		view.hidden = true
+//		return view
+//	}
+//	
+//	//
+//	//	:name:	runBoxAnimationOnView
+//	//	:description:	Runs the animation used for focusBox and exposureBox on single and double
+//	//	taps respectively at a given point.
+//	//	
+//	private func runBoxAnimationOnView(view: UIView!, point: CGPoint) {
+//		view.center = point
+//		view.hidden = false
+//		UIView.animateWithDuration(0.15, delay: 0, options: .CurveEaseInOut, animations: { _ in
+//			view.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1)
+//		}) { _ in
+//			let delayInSeconds: Double = 0.5
+//			let popTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
+//			dispatch_after(popTime, dispatch_get_main_queue()) {
+//				view.hidden = true
+//				view.transform = CGAffineTransformIdentity
+//			}
+//		}
+//	}
+//	
+//	//
+//	//	:name:	captureDevicePointForPoint
+//	//	:description:	Interprets the correct point from touch to preview layer.
+//	//	
+//	private func captureDevicePointForPoint(point: CGPoint) -> CGPoint {
+//		let previewLayer: AVCaptureVideoPreviewLayer = layer as! AVCaptureVideoPreviewLayer
+//		return previewLayer.captureDevicePointOfInterestForPoint(point)
+//	}
+//	
+//	//
+//	//	:name:	runResetAnimation
+//	//	:description:	Executes the reset animation for focus and exposure.
+//	//	
+//	private func runResetAnimation() {
+//		if !tapToFocusEnabled && !tapToExposeEnabled {
+//			return
+//		}
+//		
+//		let previewLayer: AVCaptureVideoPreviewLayer = layer as! AVCaptureVideoPreviewLayer
+//		let centerPoint: CGPoint = previewLayer.pointForCaptureDevicePointOfInterest(CGPointMake(0.5, 0.5))
+//		focusBox!.center = centerPoint
+//		exposureBox!.center = centerPoint
+//		exposureBox!.transform = CGAffineTransformMakeScale(1.2, 1.2)
+//		focusBox!.hidden = false
+//		exposureBox!.hidden = false
+//		
+//		UIView.animateWithDuration(0.15, delay: 0, options: .CurveEaseInOut, animations: { _ in
+//			self.focusBox!.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1)
+//			self.exposureBox!.layer.transform = CATransform3DMakeScale(0.7, 0.7, 1)
+//		}) { _ in
+//			let delayInSeconds: Double = 0.5
+//			let popTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)))
+//			dispatch_after(popTime, dispatch_get_main_queue()) {
+//				self.focusBox!.hidden = true
+//				self.exposureBox!.hidden = true
+//				self.focusBox!.transform = CGAffineTransformIdentity
+//				self.exposureBox!.transform = CGAffineTransformIdentity
+//				self.delegate?.previewTappedToReset?(self, focus: self.focusBox!, exposure: self.exposureBox!)
+//			}
+//		}
+//	}
+//}

Source/MaterialButton.swift

@@ -99,7 +99,6 @@ public class MaterialButton : UIButton {
 		:name:	drawRect
 		:name:	drawRect
 	*/
 	*/
 	final public override func drawRect(rect: CGRect) {
 	final public override func drawRect(rect: CGRect) {
-		prepareContext(rect)
 		prepareBackgroundColorView()
 		prepareBackgroundColorView()
 		prepareButton()
 		prepareButton()
 	}
 	}
@@ -152,18 +151,6 @@ public class MaterialButton : UIButton {
 	}
 	}
 	
 	
 	//
 	//
-	//	:name:	prepareContext
-	//
-	private func prepareContext(rect: CGRect) {
-		let context = UIGraphicsGetCurrentContext()
-		CGContextSaveGState(context);
-		CGContextAddEllipseInRect(context, rect)
-		CGContextSetFillColorWithColor(context, MaterialTheme.clear.color.CGColor)
-		CGContextFillPath(context)
-		CGContextRestoreGState(context);
-	}
-	
-	//
 	//	:name: prepareBackgroundColorView
 	//	:name: prepareBackgroundColorView
 	//
 	//
 	private func prepareBackgroundColorView() {
 	private func prepareBackgroundColorView() {

Source/NavigationViewController.swift

@@ -25,6 +25,7 @@ public class NavigationViewController: UIViewController {
 	public var titleLabel: UILabel? {
 	public var titleLabel: UILabel? {
 		didSet {
 		didSet {
 			if let v = titleLabel {
 			if let v = titleLabel {
+				v.translatesAutoresizingMaskIntoConstraints = false
 				view.addSubview(v)
 				view.addSubview(v)
 			}
 			}
 		}
 		}
@@ -36,6 +37,7 @@ public class NavigationViewController: UIViewController {
 	public var leftButton: FlatButton? {
 	public var leftButton: FlatButton? {
 		didSet {
 		didSet {
 			if let v = leftButton {
 			if let v = leftButton {
+				v.translatesAutoresizingMaskIntoConstraints = false
 				view.addSubview(v)
 				view.addSubview(v)
 			}
 			}
 		}
 		}
@@ -47,6 +49,7 @@ public class NavigationViewController: UIViewController {
 	public var rightButton: FlatButton? {
 	public var rightButton: FlatButton? {
 		didSet {
 		didSet {
 			if let v = rightButton {
 			if let v = rightButton {
+				v.translatesAutoresizingMaskIntoConstraints = false
 				view.addSubview(v)
 				view.addSubview(v)
 			}
 			}
 		}
 		}