UIImageView 等待动画完成

Question

我正在尝试执行 2 个不同的动画，在第一次完成后，使用 isAnimating。

但是，我只看到第一个动画...

if anims[0] == 1{
    startAnimation(image : #imageLiteral(resourceName: "first"))
}
if anims[1] == 2{
    while myView.isAnimating {
        RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.05))
    }
}
startAnimation(image : #imageLiteral(resourceName: "second") , time : Int)

spriteSheet 裁剪后返回 UIImage 数组..

func startAnimation(image : UIImage , time : Int){
   myView.animationImages = image.spriteSheet(cols: 19, rows: 1)
    myView.animationDuration = 1
    myView.animationRepeatCount = time
    myView.startAnimating()
}

Answer 1

你总是可以像

这样链接动画

    UIView.animate(withDuration: 1, animations: {
        //do your animation here
    }) { (state) in
        UIView.animate(withDuration: 1, animations: {
            //do your second animation
        })
    }

如果您使用的是 CABasicAnimations，那么您可以使用 beginTime 和 duration 将它们链接起来 :)

    var totalDuration = 0
    let baseicAnim1 = CABasicAnimation()
    baseicAnim1.beginTime = CACurrentMediaTime()
    totalDuration += 10
    baseicAnim1.duration = CFTimeInterval(totalDuration)

    let basicAnim2 = CABasicAnimation()
    basicAnim2.beginTime = CACurrentMediaTime() + CFTimeInterval(totalDuration)
    totalDuration += 10
    basicAnim2.duration = CFTimeInterval(totalDuration)

编辑

使用 while 循环继续检查动画是否已完成执行从来都不是建议的方法

编辑：

试试这个，

func startAnimation(image : UIImage , time : Int,completionBlock : (()->())?){
    let animationDuration = 1
    myView.animationImages = image.spriteSheet(cols: 19, rows: 1)
    myView.animationDuration = animationDuration
    myView.animationRepeatCount = time
    myView.startAnimating()

    DispatchQueue.main.asyncAfter(deadline: .now() + animationDuration, execute: {
        if let block = completionBlock {
            block()
        }
    })
}

现在您的 startAnimation 函数将完成块作为其参数，并在 animationDuration 之后执行完成块。所以你可以知道动画什么时候结束:)

链接只需调用

self.startAnimation(image: #imageLiteral(resourceName: "first"), time: 1) { 
            self.startAnimation(image: #imageLiteral(resourceName: "second"), time: 1, completionBlock: nil)
        }

希望对你有帮助