development: fixed TextField placeholder animation and updated general code style

Sources/iOS/Button.swift

@@ -133,7 +133,7 @@ open class Button: UIButton {
     */
     public convenience init(image: UIImage?) {
         self.init()
-        prepareWith(image: image, tintColor: nil)
+        prepare(with: image, tintColor: nil)
     }
     
     /**
@@ -143,7 +143,7 @@ open class Button: UIButton {
      */
     public convenience init(image: UIImage?, tintColor: UIColor?) {
         self.init()
-        prepareWith(image: image, tintColor: tintColor)
+        prepare(with: image, tintColor: tintColor)
     }
     
     /**
@@ -152,7 +152,7 @@ open class Button: UIButton {
      */
     public convenience init(title: String?) {
         self.init()
-        prepareWith(title: title, titleColor: nil)
+        prepare(with: title, titleColor: nil)
     }
     
     /**
@@ -162,7 +162,7 @@ open class Button: UIButton {
      */
     public convenience init(title: String?, titleColor: UIColor?) {
         self.init()
-        prepareWith(title: title, titleColor: titleColor)
+        prepare(with: title, titleColor: titleColor)
     }
 	
     open override func layoutSublayers(of layer: CALayer) {
@@ -259,7 +259,7 @@ open class Button: UIButton {
      - Parameter image: A UIImage.
      - Parameter tintColor: A UIColor.
      */
-    private func prepareWith(image: UIImage?, tintColor: UIColor?) {
+    private func prepare(with image: UIImage?, tintColor: UIColor?) {
         self.image = image
         self.tintColor = tintColor
     }
@@ -269,7 +269,7 @@ open class Button: UIButton {
      - Parameter title: A String.
      - Parameter titleColor: A UIColor.
      */
-    private func prepareWith(title: String?, titleColor: UIColor?) {
+    private func prepare(with title: String?, titleColor: UIColor?) {
         self.title = title
         self.titleColor = titleColor
     }

Sources/iOS/CollectionReusableView.swift

@@ -147,7 +147,7 @@ open class MaterialCollectionReusableView: UICollectionReusableView {
 	}
 	
 	/// A preset wrapper around interimSpace.
-	open var interimSpacePreset: InterimSpacePreset = .none {
+	open var interimSpacePreset = InterimSpacePreset.none {
 		didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
 		}

Sources/iOS/CollectionView.swift

@@ -62,7 +62,7 @@ open class CollectionView: UICollectionView {
 	}
 	
 	/// A preset wrapper around interimSpace.
-	open var interimSpacePreset: InterimSpacePreset = .none {
+	open var interimSpacePreset = InterimSpacePreset.none {
 		didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
 		}

Sources/iOS/CollectionViewCell.swift

@@ -155,7 +155,7 @@ open class CollectionViewCell: UICollectionViewCell {
 	}
 	
 	/// A preset wrapper around interimSpace.
-	open var interimSpacePreset: InterimSpacePreset = .none {
+	open var interimSpacePreset = InterimSpacePreset.none {
 		didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
 		}

Sources/iOS/CollectionViewLayout.swift

@@ -60,7 +60,7 @@ open class CollectionViewLayout: UICollectionViewLayout {
 	open var scrollDirection: UICollectionViewScrollDirection = .vertical
 	
 	/// A preset wrapper around interimSpace.
-	open var interimSpacePreset: InterimSpacePreset = .none {
+	open var interimSpacePreset = InterimSpacePreset.none {
 		didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
 		}

Sources/iOS/ControlView.swift

@@ -58,7 +58,7 @@ open class ControlView: View {
 	}
 	
 	/// A preset wrapper around interimSpace.
-	open var interimSpacePreset: InterimSpacePreset = .none {
+	open var interimSpacePreset = InterimSpacePreset.none {
 		didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
 		}

Sources/iOS/Grid.swift

@@ -159,7 +159,7 @@ public class Grid {
     }
     
     /// A preset wrapper for interim space.
-    public var interimSpacePreset: InterimSpacePreset = .none {
+    public var interimSpacePreset = InterimSpacePreset.none {
         didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
         }

Sources/iOS/Menu.swift

@@ -50,7 +50,7 @@ public class Menu {
 	}
 
 	/// A preset wrapper around interimSpace.
-	public var interimSpacePreset: InterimSpacePreset = .none {
+	public var interimSpacePreset = InterimSpacePreset.none {
 		didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
 		}

Sources/iOS/TabBar.swift

@@ -41,7 +41,7 @@ open class TabBar: View {
 	open internal(set) var line: UIView!
 	
 	/// A value for the line alignment.
-	open var lineAlignment: TabBarLineAlignment = .bottom {
+	open var lineAlignment = TabBarLineAlignment.bottom {
 		didSet {
 			layoutSubviews()
 		}
@@ -74,7 +74,7 @@ open class TabBar: View {
     }
     
     /// A preset wrapper around interimSpace.
-    open var interimSpacePreset: InterimSpacePreset = .none {
+    open var interimSpacePreset = InterimSpacePreset.none {
         didSet {
             interimSpace = InterimSpacePresetToValue(preset: interimSpacePreset)
         }
@@ -96,19 +96,16 @@ open class TabBar: View {
     }
     
 	/// Buttons.
-	open var buttons: [UIButton]? {
+	open var buttons = [UIButton]() {
 		didSet {
-			if let v: [UIButton] = oldValue {
-				for b in v {
-					b.removeFromSuperview()
-				}
-			}
+			for b in oldValue {
+                b.removeFromSuperview()
+            }
 			
-			if let v: [UIButton] = buttons {
-				for b in v {
-					addSubview(b)
-				}
-			}
+            for b in buttons {
+                addSubview(b)
+            }
+            
 			layoutSubviews()
 		}
 	}
@@ -116,20 +113,18 @@ open class TabBar: View {
 	open override func layoutSubviews() {
 		super.layoutSubviews()
 		if willRenderView {
-			if let v = buttons {
-				if 0 < v.count {
-					let columns: Int = grid.axis.columns / v.count
-					for b in v {
-						b.grid.columns = columns
-						b.contentEdgeInsets = .zero
-						b.layer.cornerRadius = 0
-                        b.removeTarget(self, action: #selector(handleButton(button:)), for: .touchUpInside)
-						b.addTarget(self, action: #selector(handleButton(button:)), for: .touchUpInside)
-					}
-					grid.views = v as [UIView]
-                    line.frame = CGRect(x: 0, y: .bottom == lineAlignment ? height - 3 : 0, width: v.first!.frame.width, height: 3)
-				}
-			}
+            if 0 < buttons.count {
+                let columns: Int = grid.axis.columns / buttons.count
+                for b in buttons {
+                    b.grid.columns = columns
+                    b.contentEdgeInsets = .zero
+                    b.layer.cornerRadius = 0
+                    b.removeTarget(self, action: #selector(handleButton(button:)), for: .touchUpInside)
+                    b.addTarget(self, action: #selector(handleButton(button:)), for: .touchUpInside)
+                }
+                grid.views = buttons as [UIView]
+                line.frame = CGRect(x: 0, y: .bottom == lineAlignment ? height - 3 : 0, width: buttons.first!.width, height: 3)
+            }
 		}
 	}
 	
@@ -138,8 +133,8 @@ open class TabBar: View {
 	internal func handleButton(button: UIButton) {
 		UIView.animate(withDuration: 0.25, animations: { [weak self] in
 			if let s = self {
-				s.line.frame.origin.x = button.frame.origin.x
-				s.line.frame.size.width = button.frame.size.width
+				s.line.x = button.x
+				s.line.width = button.width
 			}
 		})
 	}

Sources/iOS/TextField.swift

@@ -274,6 +274,17 @@ open class TextField: UITextField {
 	/// A reference to the visibilityIconButton.
 	open private(set) var visibilityIconButton: IconButton?
 	
+    /**
+     `layoutIfNeeded` is called within `becomeFirstResponder` to
+     fix an issue that when the TextField calls `becomeFirstResponder`
+     immediately when launching an instance, the TextField is not
+     calculated correctly.
+     */
+    open override func becomeFirstResponder() -> Bool {
+        layoutIfNeeded()
+        return super.becomeFirstResponder()
+    }
+    
 	/**
      An initializer that initializes the object with a NSCoder object.
      - Parameter aDecoder: A NSCoder instance.
@@ -314,7 +325,6 @@ open class TextField: UITextField {
 	
 	/// Handles the text editing did begin state.
 	open func handleEditingDidBegin() {
-        layoutIfNeeded()
         dividerEditingDidBeginAnimation()
 		placeholderEditingDidBeginAnimation()
 	}