UIView.animateWithDuration快速循环动画 [英] UIView.animateWithDuration swift loop animation

问题描述

在ViewController.Swift中，我设法将一个框从一个点设置为另一个点。我认为循环这很容易，所以框会动画到一个点，然后动画回到原来的位置，然后再循环。我已设法将对象移动到一个位置并在完成中再次将其移回，但这并不会使我循环。怎么能实现呢？

In ViewController.Swift I managed to make a box animate from one point to another. I thought it would be easy to loop this so the box will animate to one point and then animate back to its original position and then loop again. I have managed to move the object to a position and in "complete" move it back again, but that doesn't make i loop. How can this be achieved?

我想也许这可行但我老实说不知道：

I thought maybe this could work but i honestly don't know:

let boxmoves = [CGRect(x: 120, y: 220, width: 100, height: 100), CGRect(x: 120, y: 120, width: 100, height: 100)]
for boxmove in boxmoves {
    coloredSquare.frame = boxmove
}

我如何根据设备宽度对中心（我假设涉及一些数学？）？

How could I center it based on the device-width (I assume there are some math involved?)?

我的代码：

let coloredSquare = UIView()

coloredSquare.backgroundColor = UIColor.blueColor()

coloredSquare.frame = CGRect(x: 120, y: 120, width: 100, height: 100)

self.view.addSubview(coloredSquare)

// found repeate but this will not animate as I want.
//UIView.animateWithDuration(2.0, delay: 0.2, options: UIViewAnimationOptions.Repeat, animations: {
UIView.animateWithDuration(2.0, animations: {

    coloredSquare.frame = CGRect(x: 120, y: 220, width: 100, height: 100)

    }, completion: { finished in
        UIView.animateWithDuration(2.0, animations: {
        coloredSquare.frame = CGRect(x: 120, y: 120, width: 100, height: 100)
        })
})

推荐答案

无需执行完成块方法，只需使用动画选项参数：

No need to do the completion block approach, just use the animation options argument:

为Swift 3.0更新

UIView.animate(withDuration: 2.0, delay: 0, options: [.repeat, .autoreverse], animations: {

    coloredSquare.frame = CGRect(x: 120, y: 220, width: 100, height: 100)

}, completion: nil)

如果出于任何原因你想稍后停止动画，只需使用：

If for any reason you want to stop the animation later, just use:

coloredSquare.layer.removeAllAnimations()

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