使用Swift的UIView动画选项

Question

如何在动画块中设置UIViewAnimationOptionsto :.RepeatUIView

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

Answer 1

斯威夫特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类型:

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

你仍然可以结合选项:

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

斯威夫特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

在Swift 2.0之前的大多数Cocoa Touch'选项'集合现在都被改为结构,UIViewAnimationOptions就是其中之一.

而UIViewAnimationOptions.Repeat这在以前已经被定义为:

(半伪代码)

enum UIViewAnimationOptions {
  case Repeat
}

它现在定义为:

struct UIViewAnimationOption {
  static var Repeat: UIViewAnimationOption
}

重点是,为了实现之前使用bitmasks(.Reverse | .CurveEaseInOut)所实现的功能,您现在需要将选项放在数组中,可以直接放在options参数之后,也可以在使用之前在变量中定义:

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

要么

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

有关更多信息,请参阅user @ 0x7fffffff的以下答案:Swift 2.0 - 二进制运算符"|"不能应用于两个UIUserNotificationType操作数