问题描述

我有一个水平的 UIScrollView.我想做一个pull-to-reset"动画的变体，我一直拉到滚动视图内容大小的右边缘，松开手指，让滚动视图飞回 (0, 0) 内容偏移量.

I have a horizontal UIScrollView. I want to do a variation of the "pull-to-reset" animation, where I pull all the way past the right edge of the scroll view's content size, release my finger, and have the scroll view fly back to (0, 0) content offset.

我的委托方法如下所示:

My delegate method looks like this:

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    //check if it exceeds a certain critical value
    if (scrollView.contentOffset.x - (scrollView.contentSize.width - IMAGE_WIDTH) > 80) {
        [self doAnimatedScrollTo:CGPointMake(0, 0)];
    }
}

其中 doAnimatedScrollTo: 是一个必要的自定义动画方法，因为我想控制动画的持续时间.

where doAnimatedScrollTo: is a custom animation method necessary because I want to control the duration of the animation.

虽然这有效，但动画似乎已排队.UIScrollView反弹"动画首先发生，然后我的动画发生.

While this works, it seems that the animation is queued up. The UIScrollView "bounce" animation happens first, then my animation occurs.

有没有办法取消反弹动画，保持内容偏移从捕捉"回来，然后执行我的动画?

Is there a way to cancel the bounce animation, keep the content offset from "snapping" back, and then perform my animation?

推荐答案

试试这个

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
  //check if it exceeds a certain critical value
  if (scrollView.contentOffset.x - (scrollView.contentSize.width - IMAGE_WIDTH) > 80) {
    [scrollView setContentOffset:CGPointMake(0, 0) animated:YES];
  }
}

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