使用Swift的UIView动画选项

Question

如何在UIViewAnimationOptions动画块中将.Repeat设置为UIView：

UIView.animateWithDuration(0.2, delay:0.2 , options: UIViewAnimationOptions, animations: (() -> Void), completion: (Bool) -> Void)?)

Answer 1

Swift 3

和以前差不多：

UIView.animate(withDuration: 0.2, delay: 0.2, options: UIViewAnimationOptions.repeat, animations: {}, completion: nil)

除了你可以省略完整的类型：

UIView.animate(withDuration: 0.2, delay: 0.2, options: .repeat, animations: {}, completion: nil)

您仍然可以组合选项：

UIView.animate(withDuration: 0.2, delay: 0.2, options: [.repeat, .curveEaseInOut], animations: {}, completion: nil)

Swift 2

UIView.animateWithDuration(0.2, delay: 0.2, options: UIViewAnimationOptions.Repeat, animations: {}, completion: nil)

UIView.animateWithDuration(0.2, delay: 0.2, options: .Repeat, animations: {}, completion: nil)

UIView.animateWithDuration(0.2, delay: 0.2, options: [.Repeat, .CurveEaseInOut], animations: {}, completion: nil)

Answer 2

大多数Cocoa Touch＆＃39;选项＆＃39;在Swift 2.0之前作为枚举的集合现在已经更改为结构，UIViewAnimationOptions就是其中之一。

以前UIViewAnimationOptions.Repeat以前定义为：

（半伪代码）

enum UIViewAnimationOptions {
  case Repeat
}

现在定义为：

struct UIViewAnimationOption {
  static var Repeat: UIViewAnimationOption
}

重点是，为了实现之前使用位掩码（.Reverse | .CurveEaseInOut）所取得的成果，您现在需要将选项放在数组中，或者直接放在options参数之后，或者在使用之前在变量中定义：

UIView.animateWithDuration(0.2, delay: 0.2, options: [.Repeat, .CurveEaseInOut], animations: {}, completion: nil)

或

let options: UIViewAnimationOptions = [.Repeat, .CurveEaseInOut]
UIView.animateWithDuration(0.2, delay: 0.2, options: options, animations: {}, completion: nil)

有关详细信息，请参阅用户@ 0x7fffffff的以下答案：Swift 2.0 - Binary Operator “|” cannot be applied to two UIUserNotificationType operands

Answer 3

快捷键5

UIView.animate(withDuration: 0.2, delay: 0, options: UIView.AnimationOptions.curveEaseInOut, animations: {}, completion: nil)