iOS scrollView setContentOffset 同步问题

Question

我用 subview 初始化 UIScrollView。按钮操作后，我想:

添加新的 subview

滚动到带有动画的新 subview

动画完成后删除旧的 subview 。

为此，我执行以下操作:

[mCubeView setContentOffset:tOffset animated:YES];    
[tActualSide removeFromSuperview];

问题是，在动画开始后，“tActualSide”会立即被删除，它也会从动画中删除。

我想同步它， tActualSide 只会在动画结束时被删除。

我怎样才能做到这一点？

Answer 1

监听委托(delegate)回调:

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

当您收到该消息时

[tActualSide removeFromSuperview];

引用 Apple 文档(注意“setContentOffset:animated:”引用):

scrollViewDidEndScrollingAnimation:
Tells the delegate when a scrolling animation in the scroll view concludes.

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
Parameters
scrollView
The scroll-view object that is performing the scrolling animation.
Discussion
The scroll view calls this method at the end of its implementations of the UIScrollView and setContentOffset:animated: and scrollRectToVisible:animated: methods, but only if animations are requested.

Availability
Available in iOS 2.0 and later.
Declared In
UIScrollView.h