UIView.animateWithDuration快速循环动画|ios问答

在ViewController.Swift中，我设法使一个盒子从一个点动画到另一个点。我认为将其循环很容易，因此框将动画到一个点，然后再动画回到其原始位置，然后再次循环。我设法将对象移到某个位置，并在“完成”后再次将其移回，但这并没有使我循环。如何做到这一点？

我以为这也许行得通，但老实说我不知道：

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
}

如何根据设备宽度居中（我假设涉及数学运算？）？

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)
        })
})

无需执行完成块方法，只需使用animation选项参数即可：

已为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)

如果出于任何原因要稍后停止动画，请使用：

coloredSquare.layer.removeAllAnimations()

UIView.animate(withDuration: 3.0,
                           delay: 0.0,
                           options: [.curveLinear, .repeat],
                           animations: { () -> Void in
                           coloredSquare.frame = CGRect(x: 120, y: 220, width: 100, height: 100)

}, completion: { (finished: Bool) -> Void in

})

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