[英]Interrupting animateWithDuration
我有一个倒计时的动画计时器栏,我希望能够在满足某些条件时取消动画并重置该栏,以使它不会一直到0。类似地,如果确实做到了到0我想调用一个函数。
现在,我只是挂了一个按钮进行测试。 再次按下该按钮不会使其完全滑落,但是会在屏幕上弹起,并且完成语句中的print语句始终返回true。 我认为多个动画正相互叠加。
如何停止动画?
var countDownBar = UIView()
var button = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
// Place the countDownBar in the center of the view
countDownBar.frame = CGRectMake(0, 0, 150, 15)
countDownBar.center = view.center
countDownBar.backgroundColor = UIColor.blueColor()
view.addSubview(countDownBar)
// Add in a button
button = UIButton.buttonWithType(UIButtonType.System) as UIButton
button.frame = CGRectMake(0, 0, 50, 20)
button.center = CGPointMake(view.center.x, view.center.y + 30)
button.backgroundColor = UIColor.lightGrayColor()
button.setTitle("button", forState: UIControlState.Normal)
button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
view.addSubview(button)
}
// Do this when the button is pressed
func buttonAction (sender: UIButton) {
// Shrink the bar down to 0 width
UIView.animateWithDuration(3.0,
animations: ({
self.countDownBar.frame = CGRectMake(self.countDownBar.frame.minX, self.countDownBar.frame.minY, 0, self.countDownBar.frame.height)
}),
completion: {finished in
// When finished, reset the bar to its original length
self.countDownBar.frame = CGRectMake(0, 0, 150, 15)
self.countDownBar.center = self.view.center
// Display if completed fully or interrupted
if finished {
print("animation finished")
} else {
print("animation interrupted")
}
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
如果我正确地理解了您的问题,那么在新的usingSpringWithDamping动画调用中将选项设置为AllowUserInteration可以做到这一点。
animateWithDuration:delay:usingSpringWithDamping:initialSpringVelocity:options:animations:completion:
此外,来自WWDC 2014的构建可中断和响应式交互的会话可在以下位置进行讨论: https : //developer.apple.com/videos/wwdc/2014/可能是有用的资源(它们详细解释了它是如何工作的)。
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