iphone - UIView两个动画共存

Question

如何让一个动画在调用第二个动画后永远继续？例如:

1) 启动一个对象脉动2)在脉动时移动它3)它继续脉动

除了第二个动画无限期停止第一个动画外，一切正常。下面是一些示例代码:

//Pulsate **

        [UIView animateWithDuration:0.25
                              delay:0
                            options: (UIViewAnimationCurveEaseOut | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat)
                         animations:^{
                             CGAffineTransform currentTransform = self.transform;
                             CGAffineTransform newTransform1 = CGAffineTransformScale(currentTransform, .95, .95);
                             [self setTransform:newTransform1];
                             CGAffineTransform newTransform2 = CGAffineTransformScale(currentTransform, 1, 1);
                             [self setTransform:newTransform2];
                         } 
                         completion:nil];    


//Move **
     [UIView animateWithDuration:0.30
                      delay:0
                    options: (UIViewAnimationCurveEaseOut | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState )
                 animations:^{
                     [[(UIPinchGestureRecognizer*)sender view] setCenter:CGPointMake(myAppDelegate.MCViewReference.center.x-300, myAppDelegate.MCViewReference.center.y)];
                 } 
                 completion:^(BOOL finished){
                }];    

Answer 1

您将无法使用此处提供的基于 block 的动画来执行此操作。您需要使用带有 CABasicAnimation 的显式动画来拆分您的动画。为脉动效果创建一个动画并将其设置为无限重复。然后您可以通过设置中心(动画或非动画)来移动它。

CABasicAnimation *pulsation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
pulsation.fromValue = [NSNumber numberWithFloat:0.95f];
pulsation.toValue = [NSNumber numberWithFloat:1.f];
pulsation.duration = 0.25f;
pulsation.autoreverses = YES;
pulsation.repeatCount = INFINITY;

[self.layer addAnimation:pulsation forKey:@"pulse"];

将动画添加到图层后，它就会开始动画。要删除动画，只需调用 [self.layer removeAnimationForKey:@"pulse" 或 removeAllAnimations:。