如何删除子视图（或视图的所有子视图）

发布于 2024-11-04 22:14:43 字数 703 浏览 0 评论 0原文

我有一个方法，在其中分配并初始化一个

UIView (`tabsClippedView = [[[UIView alloc] initWithFrame:tabsClippedFrame] autorelease];`).

此视图，其中添加了另一个视图

(`tabsView = [[[UIView alloc] initWithFrame:tabsFrame] autorelease];`).

然后我启动几个按钮

(e.g. `UIButton* btn = [[[UIButton alloc] initWithFrame:frame] autorelease];`)

并将它们添加到视图的子视图中。

现在，我有时需要删除所有按钮并重新分配它们。删除整个视图或仅删除我添加按钮的子视图是最好的方法吗？

我需要如何做到这一点（没有内存泄漏等）？ 一个简单的

self.tabsView = nil;

足以删除视图及其所有子视图（即按钮）吗？

或者最好也删除超级视图，完全从头开始：

self.tabsClippedView = nil;

原文

I have a method in which I alloc and init an

UIView (`tabsClippedView = [[[UIView alloc] initWithFrame:tabsClippedFrame] autorelease];`).

This view has another view added to it

(`tabsView = [[[UIView alloc] initWithFrame:tabsFrame] autorelease];`).

Then I initiate a couple of buttons

(e.g. `UIButton* btn = [[[UIButton alloc] initWithFrame:frame] autorelease];`)

and add them to the subview of the view.

Now from time to time, I need to delete all the buttons and assign them again. Is the best way to delete the entire view or simply the subview to which I added the buttons?

How would I need to do this (without memory leaking etc.)? Would a simple

self.tabsView = nil;

suffice to delete the view and all of its subviews (i.e. the buttons)?

Or would it better to delete the superview as well, to start entirely from scratch:

self.tabsClippedView = nil;

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

林空鹿饮溪 2024-11-11 22:14:43

由于您的 UIView 是自动释放的，因此您只需将其从超级视图中删除即可。为此，有 removeFromSuperview 方法。

因此，您只需调用 [self.tabsView removeFromSuperview] 即可。只要您的属性声明设置为retain，这就是您所需要的。

回复收藏 0 原文

不醒的梦 2024-11-11 22:14:43

另一个解决方案：不要删除 UIButtons 而是重新使用它们。不知道您的确切用例，但您可以将 tags 分配给您的 UIButtons 并使用 [UIView viewWithTag:] 找到它们。

UIButton* btn = [[UIButton alloc] initWithFrame:frame];
btn.tag = 42; // some unique identifier for the button.. dont use 0 (zero)
[tabsView addSubview:btn];
[btn release];

稍后...

UIButton* btn = (UIButton*)[tabsView viewWithTag:42];
if(btn && [btn isKindOfClass:[UIButton class]]) {
    // do some stuff with btn
}

此外：在我看来，只有在没有其他选择时才应该使用 autorelease 。在这里，您可以轻松地将 btn 添加为子视图后释放它。

Another solution: don't remove your UIButtons but re-use them. Don't know the exact use-case for you, but you may assign tags to your UIButtons and find them with [UIView viewWithTag:].

UIButton* btn = [[UIButton alloc] initWithFrame:frame];
btn.tag = 42; // some unique identifier for the button.. dont use 0 (zero)
[tabsView addSubview:btn];
[btn release];

later...

UIButton* btn = (UIButton*)[tabsView viewWithTag:42];
if(btn && [btn isKindOfClass:[UIButton class]]) {
    // do some stuff with btn
}

Besides: In my opinion you only should use autorelease when you've no other options. Here it's easy for you to release btn after adding it as subview.

回复收藏 0 原文

~没有更多了~