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)
- }
- }
