带来SubviewToFront问题？ [英] bringSubviewToFront problem?

问题描述

HI，
我有Parentview - >多个子视图。
当我在parentview中使用[self bringSubviewToFront：childview]时，它运行正常。但是在将childchildview添加到childview之后，当我在parentview中使用
[self bringSubviewToFront：grandchildview]时，它没有用？任何帮助请？

I have Parentview-->Multiple childviews. when i use [self bringSubviewToFront:childview] in parentview, it works fine.but after adding grandchildview to childview,when i use [self bringSubviewToFront: grandchildview] in parentview, it did not work?any help please?

推荐答案

- [UIView bringSubviewToFront：] 方法仅适用直接的孩子，而不是孙子。请记住，视图层次结构是一棵树，通常视图只知道其父（或超级视图）及其直接子（或子视图）。您需要执行以下操作：

The -[UIView bringSubviewToFront:] method only works for direct children, not grandchildren. Remember that the view hierarchy is a tree, and normally a view only knows about its "parent" (or superview) and its direct "children" (or subviews). You would need to do something like this:

// First, get the view embedding the grandchildview to front.
[self bringSubviewToFront:[grandchildview superview]];
// Now, inside that container view, get the "grandchildview" to front. 
[[grandchildview superview] bringSubviewToFront:grandchildview];

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