Question

Iv为CALayer制作动画以沿曲线移动。动画完成后，我会在animationDidStop委托中隐藏图层。假设我将图层的frame.origin设置为x点。我将图层设置为动画，以便从点x移动到点y。动画停止后，我将图层设置为隐藏。但是，在隐藏之前，图层会再次出现在x点。为什么会这样？如何停止此操作并在动画停止到达y点后立即隐藏图层？

-(void)doAnimation  
{  
UIImage *movingImage = [UIImage imageNamed:@"XYZ.png"];  
movingLayer = [CALayer layer];   
 movingLayer.contents = (id)movingImage.CGImage;  
 movingLayer.anchorPoint = CGPointZero;  
 movingLayer.frame = CGRectMake(700.0f, 50.0f, movingImage.size.width, movingImage.size.height);  
 [self.view.layer addSublayer:movingLayer];

UIBezierPath *customPath = [UIBezierPath bezierPath];  
[customPath moveToPoint:CGPointMake(700,50)];  
[customPath addQuadCurveToPoint:CGPointMake(550, 50) controlPoint:CGPointMake(630, 10)];  
[customPath addQuadCurveToPoint:CGPointMake(270, 33) controlPoint:CGPointMake(355, -10)];  
[customPath addQuadCurveToPoint:CGPointMake(120, 0) controlPoint:CGPointMake(190, 0)];   
[customPath addLineToPoint:CGPointMake(-20, 20)];  

CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];  
 pathAnimation.duration = 6.5f;  
 pathAnimation.path = customPath.CGPath;  
 pathAnimation.calculationMode = kCAAnimationLinear;  
 pathAnimation.delegate=self;  
 [movingLayer addAnimation:pathAnimation forKey:@"movingAnimation"];

}


-(void)animationDidStop:(CAAnimation *)animID finished:(BOOL)didFinish  
{  
movingLayer.hidden=YES;  
}

Answer 1

启动动画时，应将图层的位置设置为目的地。

CALayer的奇怪行为

1 个答案: