将动画组合在单一属性上

Question

如何使用两个单独的CABasicAnimations同时为同一属性设置动画？

例如,两个CABasicAnimations,都是animate position.y.

第一个动画将是反弹(从100到300,持续时间= 1,autoreverse = yes,repeatcount = 10)

第二个动画将是一个慢速滚动(100,持续时间= 10)

我看到的行为是,如果第一个动画正在进行中,我使用:

[pickle.layer addAnimation:[self makescrollanimation] forKey:@"scrollit"];

添加第二个...第二个被忽略.

我知道第二个动画是有效的,因为如果我从第二个动画开始,那么第一个动画将被忽略.

谢谢 - 马特

Answer 1

如果我理解正确,你希望视图在整个弹跳动作缓慢向下移动时上下弹跳.您可以通过使用其添加属性制作动画添加剂来实现此目的.例如:

CABasicAnimation *bounceAnimation = [CABasicAnimation animationWithKeyPath:@"position.y"];
bounceAnimation.duration = 1;
bounceAnimation.fromValue = [NSNumber numberWithInt:100];
bounceAnimation.toValue = [NSNumber numberWithInt:300];
bounceAnimation.repeatCount = 10;
bounceAnimation.autoreverses = YES;
bounceAnimation.fillMode = kCAFillModeForwards;
bounceAnimation.removedOnCompletion = NO;
bounceAnimation.additive = YES;
[view.layer addAnimation:bounceAnimation forKey:@"bounceAnimation"];

CABasicAnimation *scrollAnimation = [CABasicAnimation animationWithKeyPath:@"position.y"];
scrollAnimation.duration = 10;
scrollAnimation.fromValue = [NSNumber numberWithInt:0];
scrollAnimation.toValue = [NSNumber numberWithInt:100];
scrollAnimation.fillMode = kCAFillModeForwards;
scrollAnimation.removedOnCompletion = NO;
scrollAnimation.additive = YES;
[view.layer addAnimation:scrollAnimation forKey:@"scrollAnimation"];

如果我正确地阅读你的问题,应该完成你想要的动画.应该能够在反弹动画期间的任何时刻触发滚动动画.