updated CaptureSession internals for setting modes, with example UI update

Examples/Programmatic/CaptureView/CaptureView/Assets.xcassets/ic_switch_camera_white.imageset/Contents.json

-{
-  "images" : [
-    {
-      "idiom" : "universal",
-      "filename" : "ic_switch_camera_white.png",
-      "scale" : "1x"
-    },
-    {
-      "idiom" : "universal",
-      "filename" : "ic_switch_camera_white@2x.png",
-      "scale" : "2x"
-    },
-    {
-      "idiom" : "universal",
-      "filename" : "ic_switch_camera_white@3x.png",
-      "scale" : "3x"
-    }
-  ],
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}
\ No newline at end of file

Examples/Programmatic/CaptureView/CaptureView/ViewController.swift

@@ -127,7 +127,7 @@ class ViewController: UIViewController, CapturePreviewViewDelegate, CaptureSessi
 	:name:	prepareSwitchCameraButton
 	*/
 	private func prepareSwitchCameraButton() {
-		let img: UIImage? = UIImage(named: "ic_switch_camera_white")
+		let img: UIImage? = UIImage(named: "ic_camera_front_white")
 		switchCameraButton.pulseColor = MaterialColor.white
 		switchCameraButton.pulseFill = true
 		switchCameraButton.setImage(img, forState: .Normal)
@@ -139,6 +139,8 @@ class ViewController: UIViewController, CapturePreviewViewDelegate, CaptureSessi
 	:name:	prepareFlashButton
 	*/
 	private func prepareFlashButton() {
+		captureView.captureSession.flashMode = .Auto
+		
 		let img: UIImage? = UIImage(named: "ic_flash_auto_white")
 		flashButton.pulseColor = MaterialColor.white
 		flashButton.pulseFill = true
@@ -176,7 +178,18 @@ class ViewController: UIViewController, CapturePreviewViewDelegate, CaptureSessi
 	:name:	handleSwitchCameraButton
 	*/
 	internal func handleSwitchCameraButton(button: UIButton) {
-		captureView.captureSession.switchCameras()
+		var img: UIImage?
+		
+		if .Back == captureView.captureSession.cameraPosition {
+			img = UIImage(named: "ic_camera_rear_white")
+			captureView.captureSession.switchCameras()
+		} else if .Front == captureView.captureSession.cameraPosition {
+			img = UIImage(named: "ic_camera_front_white")
+			captureView.captureSession.switchCameras()
+		}
+		
+		switchCameraButton.setImage(img, forState: .Normal)
+		switchCameraButton.setImage(img, forState: .Highlighted)
 	}
 	
 	/**
@@ -189,19 +202,16 @@ class ViewController: UIViewController, CapturePreviewViewDelegate, CaptureSessi
 		case .Off:
 			img = UIImage(named: "ic_flash_on_white")
 			captureView.captureSession.flashMode = .On
-			print("On")
 		case .On:
 			img = UIImage(named: "ic_flash_auto_white")
-			captureView.captureSession.flashMode = .Off
-			print("Auto")
+			captureView.captureSession.flashMode = .Auto
 		case .Auto:
 			img = UIImage(named: "ic_flash_off_white")
-			captureView.captureSession.flashMode = .On
-			print("Off")
+			captureView.captureSession.flashMode = .Off
 		}
 		
-		captureView.flashButton?.setImage(img, forState: .Normal)
-		captureView.flashButton?.setImage(img, forState: .Highlighted)
+		flashButton.setImage(img, forState: .Normal)
+		flashButton.setImage(img, forState: .Highlighted)
 	}
 	
 	/**

Sources/CaptureSession.swift

@@ -194,6 +194,13 @@ public class CaptureSession : NSObject, AVCaptureFileOutputRecordingDelegate {
 	}
 	
 	/**
+	:name:	cameraPosition
+	*/
+	public var cameraPosition: AVCaptureDevicePosition {
+		return activeCamera!.position
+	}
+	
+	/**
 	:name:	focusMode
 	*/
 	public var focusMode: AVCaptureFocusMode {
@@ -206,7 +213,7 @@ public class CaptureSession : NSObject, AVCaptureFileOutputRecordingDelegate {
 				do {
 					let device: AVCaptureDevice = activeCamera!
 					try device.lockForConfiguration()
-					device.focusMode = focusMode
+					device.focusMode = value
 					device.unlockForConfiguration()
 				} catch let e as NSError {
 					error = e
@@ -233,7 +240,7 @@ public class CaptureSession : NSObject, AVCaptureFileOutputRecordingDelegate {
 				do {
 					let device: AVCaptureDevice = activeCamera!
 					try device.lockForConfiguration()
-					device.flashMode = flashMode
+					device.flashMode = value
 					device.unlockForConfiguration()
 				} catch let e as NSError {
 					error = e
@@ -260,7 +267,7 @@ public class CaptureSession : NSObject, AVCaptureFileOutputRecordingDelegate {
 				do {
 					let device: AVCaptureDevice = activeCamera!
 					try device.lockForConfiguration()
-					device.torchMode = torchMode
+					device.torchMode = value
 					device.unlockForConfiguration()
 				} catch let e as NSError {
 					error = e