单个 UIView 上的多个同时 UIViewAnimations
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【中文标题】单个 UIView 上的多个同时 UIViewAnimations【英文标题】:Multiple Simultaneous UIViewAnimations on a Single UIView 【发布时间】:2014-01-10 04:50:51 【问题描述】:目标:在单个 UIView 上同时播放多个动画。 问题:据我所知,这是不可能的。每个动画必须按顺序出现,不能重叠。
本质上,我想要一个 UIView 垂直动画,同时水平动画。由于我使用的是 UIViewAnimationOptionRepeat,因此我无法在 onCompletion 中嵌套任何其他动画:这是我想要工作但没有做到的:
[UIView animateWithDuration:duration
delay:kANIMATION_DELAY
options:UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse animations:^
object.frame = CGRectMake(object.frame.origin.x + 40,
object.frame.origin.y,
object.frame.size.width,
object.frame.size.height);
[UIView animateWithDuration:duration
delay:kANIMATION_DELAY
options:UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse animations:^
object.frame = CGRectMake(object.frame.origin.x,
object.frame.origin.y - 40,
object.frame.size.width,
object.frame.size.height);
completion:^(BOOL finished)
];
completion:^(BOOL finished)
];
【问题讨论】:
【参考方案1】:答案不是使用 UIViewAnimation 块,而是使用 CABasicAnimations。使用它们,您可以分别操纵中心坐标 (x,y)。这是我的代码现在的样子:
UIView *view = views[i];
// Add the horizontal animation
CABasicAnimation *horizontal = [CABasicAnimation animationWithKeyPath:@"position.x"];
horizontal.delegate = self;
horizontal.fromValue = [NSNumber numberWithFloat:25.0];
horizontal.toValue = [NSNumber numberWithFloat:50.0];
horizontal.repeatCount = INFINITY;
horizontal.duration = 6;
horizontal.autoreverses = YES;
horizontal.beginTime = 0; // ignore delay time for now
horizontal.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[view.layer addAnimation:horizontal forKey:@"horizontal_animation"];
// Add the vertical animation
CABasicAnimation *vertical = [CABasicAnimation animationWithKeyPath:@"position.y"];
vertical.delegate = self;
vertical.fromValue = [NSNumber numberWithFloat:100.0];
vertical.toValue = [NSNumber numberWithFloat:400.0];
vertical.repeatCount = INFINITY;
vertical.duration = 2;
vertical.autoreverses = YES;
vertical.beginTime = 0; // ignore delay time for now
vertical.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
[view.layer addAnimation:vertical forKey:@"vertical_animation"];
这允许我在两个单独的动画中处理重复、持续时间等。然后,当我的动画结束时,我可以调用 follow 方法来删除动画。要么,
[view.layer removeAllAnimations];
或者,如果我想删除更具体的动画,
[view.layer removeAnimationForKey:@"vertical_animation"];
然后,如果您想对动画开始/停止的时间进行更多自定义控制,您只需要像这样添加委托方法:
-(void)animationDidStart:(CAAnimation *)anim
// custom code here
-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
// custom code here
它非常甜蜜和容易。希望这可以帮助任何有类似需求的人。干杯!
【讨论】:
您在 for 键中遗漏了 addAnimation [view.layer addAnimation:horizontal forKey:@"horizontal_animation"];以上是关于单个 UIView 上的多个同时 UIViewAnimations的主要内容,如果未能解决你的问题,请参考以下文章