展开动画
self.layer.anchorPoint = CGPoint.init(x: 0.5, y: 0)
let baseAnimation = CABasicAnimation.init(keyPath: "transform")
baseAnimation.fromValue = NSValue.init(caTransform3D: CATransform3DMakeScale(1.0, 0.01, 0.01))
baseAnimation.toValue = NSValue.init(caTransform3D: CATransform3DMakeScale(1.0, 1.0, 1.0))
baseAnimation.beginTime = CACurrentMediaTime()
baseAnimation.duration = 0.5
baseAnimation.autoreverses = false // 动画执行逆动画
baseAnimation.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseInEaseOut)
baseAnimation.isRemovedOnCompletion = true // 完成后移除动画 想要在动画完成后的delegate
做操作的话就改成false 配合动画执行完不返回原状态效果更好
baseAnimation.fillMode = kCAFillModeForwards // 动画执行完后不返回原状态
baseAnimation.delegate = self as? CAAnimationDelegate
baseAnimation.setValue("addAnimation", forKey: "animType")
self.layer.add(baseAnimation, forKey: "transform")
收起
func createRemoveAnimationFromeTop() -> Void {
self.layer.anchorPoint = CGPoint.init(x: 0.5, y: 0)
let transform = CABasicAnimation.init(keyPath: "transform")
transform.fromValue = NSValue.init(caTransform3D: CATransform3DMakeScale(1.0, 1.0, 1.0))
transform.toValue = NSValue.init(caTransform3D: CATransform3DMakeScale(1.0, 0.01, 0.01))
transform.duration = 0.5
transform.beginTime = CACurrentMediaTime()
transform.timingFunction = CAMediaTimingFunction.init(name: kCAMediaTimingFunctionEaseInEaseOut)
transform.delegate = self as? CAAnimationDelegate
transform.isRemovedOnCompletion = false
transform.fillMode = kCAFillModeForwards
transform.setValue("removeAnimation", forKey: "animType")
self.layer.add(transform, forKey: "removeAnimation")
}
// UIView执行动画 所有拥有这个key的动画的View都会执行
override func removeFromSuperview() {
self.layer.removeAllAnimations()
self.createRemoveAnimationFromeTop()
UIView.beginAnimations("removeAnimation", context: nil)
}
func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
if flag {
let value = anim.value(forKey: "animType") as! NSString
if value.isEqual(to: "removeAnimation") {
// 动画执行完毕，关掉beginAnimation 防止一些不
// 想要的情况出现
UIView.commitAnimations()
super.removeFromSuperview()
}
}
}
动画暂停
func pauseLayer(layer:CALayer) -> Void {
let pauseTimed = layer.convertTime(CACurrentMediaTime(), from: nil)
layer.speed = 0
layer.timeOffset = pauseTimed
}
动画继续
func resumeLayer(layer:CALayer) -> Void {
let pausedTime = layer.timeOffset
layer.speed = 1.0
layer.timeOffset = 0.0
layer.beginTime = 0.0
let timeSincePause = layer.convertTime(CACurrentMediaTime(), from: nil) - pausedTime
layer.beginTime = timeSincePause
}
