单个UIView上的多个同时UIViewAnimations

Question

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发生,不能重叠.

本质上,我想要一个UIView垂直动画,同时水平动画.因为我正在使用UIViewAnimationOptionRepeat,所以我无法在onCompletion中嵌套任何其他动画:这是我想要的工作,但不是:

[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) {
}];

Answer 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,如果您想要在动画开始/停止时进行更多自定义控制,您只需要添加委托方法,如下所示:

    -(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.希望这有助于任何有类似需求的人.干杯!