layoutShadowPath added to better performance of animations with depth

Sources/MaterialButton.swift

@@ -180,6 +180,7 @@ public class MaterialButton : UIButton {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -203,6 +204,7 @@ public class MaterialButton : UIButton {
 		}
 		set(value) {
 			layer.cornerRadius = value
+			layoutShadowPath()
 			if .Circle == shape {
 				shape = .None
 			}
@@ -222,6 +224,7 @@ public class MaterialButton : UIButton {
 				} else {
 					frame.size.height = width
 				}
+				layoutShadowPath()
 			}
 		}
 	}

Sources/MaterialCollectionViewCell.swift

@@ -217,6 +217,7 @@ public class MaterialCollectionViewCell : UICollectionViewCell {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -240,6 +241,7 @@ public class MaterialCollectionViewCell : UICollectionViewCell {
 		}
 		set(value) {
 			layer.cornerRadius = value
+			layoutShadowPath()
 			if .Circle == shape {
 				shape = .None
 			}
@@ -259,6 +261,7 @@ public class MaterialCollectionViewCell : UICollectionViewCell {
 				} else {
 					frame.size.height = width
 				}
+				layoutShadowPath()
 			}
 		}
 	}

Sources/MaterialLayer.swift

@@ -165,6 +165,7 @@ public class MaterialLayer : CAShapeLayer {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -188,6 +189,7 @@ public class MaterialLayer : CAShapeLayer {
 	*/
 	public override var cornerRadius: CGFloat {
 		didSet {
+			layoutShadowPath()
 			if .Circle == shape {
 				shape = .None
 			}
@@ -207,6 +209,7 @@ public class MaterialLayer : CAShapeLayer {
 				} else {
 					frame.size.height = width
 				}
+				layoutShadowPath()
 			}
 		}
 	}
@@ -325,4 +328,9 @@ public class MaterialLayer : CAShapeLayer {
 			cornerRadius = width / 2
 		}
 	}
+	
+	/// Sets the shadow path.
+	internal func layoutShadowPath() {
+		shadowPath = .None == depth ? nil : UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).CGPath
+	}
 }

Sources/MaterialTableViewCell.swift

@@ -173,6 +173,7 @@ public class MaterialTableViewCell: UITableViewCell {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -196,6 +197,7 @@ public class MaterialTableViewCell: UITableViewCell {
 		}
 		set(value) {
 			layer.cornerRadius = value
+			layoutShadowPath()
 		}
 	}
 	

Sources/MaterialView.swift

@@ -223,6 +223,7 @@ public class MaterialView : UIView {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -246,6 +247,7 @@ public class MaterialView : UIView {
 		}
 		set(value) {
 			layer.cornerRadius = value
+			layoutShadowPath()
 			if .Circle == shape {
 				shape = .None
 			}
@@ -265,6 +267,7 @@ public class MaterialView : UIView {
 				} else {
 					frame.size.height = width
 				}
+				layoutShadowPath()
 			}
 		}
 	}

Sources/TextField.swift

@@ -159,6 +159,7 @@ public class TextField : UITextField {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -182,6 +183,7 @@ public class TextField : UITextField {
 		}
 		set(value) {
 			layer.cornerRadius = value
+			layoutShadowPath()
 			if .Circle == shape {
 				shape = .None
 			}
@@ -201,6 +203,7 @@ public class TextField : UITextField {
 				} else {
 					frame.size.height = width
 				}
+				layoutShadowPath()
 			}
 		}
 	}

Sources/TextView.swift

@@ -161,6 +161,7 @@ public class TextView: UITextView {
 			shadowOffset = value.offset
 			shadowOpacity = value.opacity
 			shadowRadius = value.radius
+			layoutShadowPath()
 		}
 	}
 	
@@ -184,6 +185,7 @@ public class TextView: UITextView {
 		}
 		set(value) {
 			layer.cornerRadius = value
+			layoutShadowPath()
 			if .Circle == shape {
 				shape = .None
 			}
@@ -203,6 +205,7 @@ public class TextView: UITextView {
 				} else {
 					frame.size.height = width
 				}
+				layoutShadowPath()
 			}
 		}
 	}