我有一个图像,我使用此代码为viewDidAppear设置动画：
UIView.animateWithDuration(10.5,delay:0.0,options: [],animations:{
self.myImage.transform = CGAffineTransformMakeTranslation(0.0,200)
},completion: nil)
我想点击myPauseButton时暂停动画,如果我再次点击它,则恢复动画.
解决方法
暂停和恢复动画的2个功能,我从
here开始转换为Swift.
func pauseLayer(layer: CALayer) {
let pausedTime: CFTimeInterval = layer.convertTime(CACurrentMediaTime(),fromLayer: nil)
layer.speed = 0.0
layer.timeOffset = pausedTime
}
func resumeLayer(layer: CALayer) {
let pausedTime: CFTimeInterval = layer.timeOffset
layer.speed = 1.0
layer.timeOffset = 0.0
layer.beginTime = 0.0
let timeSincePause: CFTimeInterval = layer.convertTime(CACurrentMediaTime(),fromLayer: nil) - pausedTime
layer.beginTime = timeSincePause
}
我有一个按钮来暂停或恢复在viewDidLoad中初始化的动画：
var pause = false
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
UIView.animateWithDuration(10.5,animations:{
self.image.transform = CGAffineTransformMakeTranslation(0.0,200)
},completion: nil)
}
@IBAction func changeState() {
let layer = image.layer
pause = !pause
if pause {
pauseLayer(layer)
} else {
resumeLayer(layer)
}
}
