ios 怎么讲一个动画加到多个layer 上

答案:1 悬赏:40

解决时间 2021-01-10 17:20

提问者网友：活着好累
2021-01-10 07:13

最佳答案

二级知识专家网友：执傲
2021-01-10 08:49

frame没有关键帧，可以用动画组实现
CGRect frame = itemLayer.frame;
CABasicAnimation *aniBounds = [CABasicAnimation animationWithKeyPath:@"bounds"];
aniBounds.fromValue = [NSValue valueWithCGRect:CGRectMake(0, 0, CGRectGetWidth(frame), 0)];
aniBounds.toValue = [NSValue valueWithCGRect:CGRectMake(0, 0, CGRectGetWidth(frame), CGRectGetHeight(frame))];

CABasicAnimation *aniAnchorPoint = [CABasicAnimation animationWithKeyPath:@"anchorPoint"];
aniAnchorPoint.fromValue = [NSValue valueWithCGPoint:CGPointMake(0, 1)];
aniAnchorPoint.toValue = [NSValue valueWithCGPoint:CGPointMake(0, 1)];

CABasicAnimation *aniPosition = [CABasicAnimation animationWithKeyPath:@"position"];
aniPosition.fromValue = [NSValue valueWithCGPoint:CGPointMake(CGRectGetMinX(frame), _chartHeight+3)];
aniPosition.toValue = [NSValue valueWithCGPoint:CGPointMake(CGRectGetMinX(frame), positionYto)];

CAAnimationGroup *anis = [CAAnimationGroup animation];
anis.animations = @[aniAnchorPoint,aniBounds,aniPosition];
anis.duration = 0.4;
anis.removedOnCompletion = NO;
anis.fillMode=kCAFillModeForwards;
[itemLayer addAnimation:anis forKey:nil];

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