ios layer怎么实现frame动画？

答案:1 悬赏:40 手机版

解决时间 2021-03-17 05:06

提问者网友：書生途
2021-03-16 18:51

最佳答案

五星知识达人网友：神鬼未生
2021-03-16 19:40

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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