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。我已经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 options参数即可:
已针对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()