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iOS animation 核心动画 顺序执行

Sophia的玲珑阁 2023-05-22 阅读 51


Core Animation

position and then opacity).. normal approach is to directly change properties:

layer.position = new_point;
layer.opacity = 0.0f;

but this will do them at the same time. I want to make one wait for the other..

You can also use animation grouping and use the beginTime field of the animation. Try something like this:

CABasicAnimation *posAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
[posAnimation setFromValue:[NSNumber numberWithFloat:0.0]];
[posAnimation setToValue:[NSNumber numberWithFloat:1.0]];
// Here's the important part
[posAnimation setDuration:10.0];
[posAnimation setBeginTime:0.0];

CABasicAnimation *borderWidthAnimation = [CABasicAnimation animationWithKeyPath:@"borderWidth"];
[borderWidthAnimation setFromValue:[NSNumber numberWithFloat:0.0]];
[borderWidthAnimation setToValue:[NSNumber numberWithFloat:1.0]];
// Here's the important part
[borderWidthAnimation setDuration:10.0];
[borderWidthAnimation setBeginTime:5.0];

CAAnimationGroup *group = [CAAnimationGroup animation];
[group setDuration:10.0];
[group setAnimations:[NSArray arrayWithObjects:posAnimation, borderWidthAnimation, nil]];

[layer addAnimation:group forKey:nil];

Notice that the duration of the entire animation is 10 seconds. The first one starts at second 0 and the second one starts at 5 seconds.



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