ios - 如何在uiview动画中使用数组

Question

我创建了一个 UIView 动画，我的数组包含 10 张图像。我想在按下按钮时将一个地方移动到另一个地方。下面的代码可以正常工作，但问题是所有 10 张图片都在移动。

-(IBAction)moveImageAtIndex:(int)index {
    UIButton *buttonCelebrate = [redAppleArray objectAtIndex:j];
    UIButton *buttonRefer = [reffButtonArray objectAtIndex:j];

    currentView = buttonCelebrate;
    CGRect frame = currentView.frame;
    CGRect frame1 = buttonRefer.frame;

    frame.origin.x = frame1.origin.x;
    frame.origin.y = frame1.origin.y;

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration: 2.0];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    currentView.frame = frame;

    [UIView animateWithDuration:2.0 animations:^
     {
         [currentView setTransform:CGAffineTransformIdentity];

     }completion:^(BOOL finished) {
         if (finished) {
             if(index != [redAppleArray count] - 1) {
                 [self moveImageAtIndex:index+1];
              }
         }
     }];

    [UIView commitAnimations];
 }

预期输出是:我想一个接一个地移动，而不是全部移动。

screenshot

Answer 1

必须等到当前动画播放完毕，才能开始下一个动画。一个简单的解决方案是使用递归:

-(void)moveImageAtIndex:(int)index {
    [UIView animateWithDuration:2.0 animations:^{
         //Do animation
     }completion:^(BOOL finished) {
         if (finished) {
             if(index != [redAppleArray count] - 1) {
                  [self moveImageAtIndex:index + 1];
             }
         }
     }];
}