ios UIView.animateWithDuration 快速循环动画
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UIView.animateWithDuration swift loop animation
提问by Johan Ndiyo Linnarsson
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?
在 ViewController.Swift 中，我设法让一个盒子从一个点到另一个点动画。我认为循环这个很容易，所以盒子会动画到一个点，然后动画回到它的原始位置，然后再次循环。我已经设法将对象移动到一个位置，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？
I thought maybe this could work but i honestly don't know:
我想也许这可行，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
}
How could I center it based on the device-width (I assume there are some math involved?)?
我怎么能根据设备宽度将它居中（我假设涉及一些数学？）？
My code:
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)
})
})
回答by Mazyod
No need to do the completion block approach, just use the animation options argument:
无需执行完成块方法，只需使用动画选项参数：
updated for Swift 3.0
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)
If for any reason you want to stop the animation later, just use:
如果出于任何原因您想稍后停止动画，只需使用：
coloredSquare.layer.removeAllAnimations()
回答by niku
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
})
