我有一個基本的iPhone旋轉動畫。有什么方法可以“暫?！眲赢?，以便維持視圖的位置？我想這樣做的一種方法是使動畫“完成”，而不是對其調用“刪除”，我該怎么做？CABasicAnimation* rotationAnimation;rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2];rotationAnimation.duration = 100;rotationAnimation.cumulative = YES;rotationAnimation.repeatCount = HUGE_VALF;rotationAnimation.removedOnCompletion = NO;rotationAnimation.fillMode = kCAFillModeForwards;[myView.layer addAnimation:rotationAn
3 回答
偶然的你
TA貢獻1841條經驗 獲得超3個贊
最近出現的Apple技術說明QA1673描述了如何暫停/恢復圖層的動畫。
暫停和恢復動畫列表如下：
-(void)pauseLayer:(CALayer*)layer
{
CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil];
layer.speed = 0.0;
layer.timeOffset = pausedTime;
}
-(void)resumeLayer:(CALayer*)layer
{
CFTimeInterval pausedTime = [layer timeOffset];
layer.speed = 1.0;
layer.timeOffset = 0.0;
layer.beginTime = 0.0;
CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime;
layer.beginTime = timeSincePause;
}
編輯： iOS 10引入了新的API-UIViewPropertyAnimator，該API可以更交互地處理動畫，例如，它使暫停和恢復動畫或“搜索”到特定進度值變得容易。
HUH函數
TA貢獻1836條經驗 獲得超4個贊
回答Swift 3：
積分@Vladimir
碼：
func pauseAnimation(){
let pausedTime = layer.convertTime(CACurrentMediaTime(), fromLayer: nil)
layer.speed = 0.0
layer.timeOffset = pausedTime
}
func resumeAnimation(){
let pausedTime = layer.timeOffset
layer.speed = 1.0
layer.timeOffset = 0.0
layer.beginTime = 0.0
let timeSincePause = layer.convertTime(CACurrentMediaTime(), fromLayer: nil) - pausedTime
layer.beginTime = timeSincePause
}
心有法竹
TA貢獻1866條經驗 獲得超5個贊
您可以使用計時器或處理動畫委托方法：
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
這是我的代碼：
// ...
[self startAnimation];
// ...
- (void)startAnimation {
CABasicAnimation* rotationAnimation;
rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
rotationAnimation.fromValue = [NSNumber numberWithFloat:0];
rotationAnimation.toValue = [NSNumber numberWithFloat: M_2_PI];
rotationAnimation.duration = 1.0;
rotationAnimation.cumulative = YES;
// rotationAnimation.repeatCount = 0; // <- if repeatCount set to infinite, we'll not receive the animationDidStop notification when the animation is repeating
rotationAnimation.removedOnCompletion = NO;
rotationAnimation.fillMode = kCAFillModeForwards;
rotationAnimation.delegate = self; // <- hanlde the animationDidStop method
[myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
if (shouldContinueAnimation) // <- set a flag to start/stop the animation
[self startAnimation];
}
希望它能對您有所幫助。
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