UINavigationBar .items访问器不返回当前的UINavigationItem

问题描述

在我的 UINavigationBar:didPopItem:函数中，导航栏的 _itemStack 中有n个项目，在调试器中显示，但是 .items 访问器函数返回一个数组，其中包含n-1个项目，但缺少当前的导航项目，这就是我要检查的内容. backItem 返回n-2项，而不是n-1，依此类推. didPopItem 项是'n + 1'项，因此也无济于事./p>

如何访问当前的UINavigationItem?

我正在使用iPhone 3.0 SDK.

解决方案

似乎在返回RunLoop之后将对"items"属性进行调整.因此，尝试这样.

 -(void)XXX:(UINavigationBar *)nBar {UINavigationItem * cItem = [nBar.items objectAtIndex:(nBar.items.count-1)];}-(void)navigationBar:(UINavigationBar *)nBar didPopItem:(UINavigationItem *)item {[self performSelector:@selector(XXX)withObject:nBar afterDelay:0];} 

In my UINavigationBar: didPopItem: function the navigation bar's _itemStack has n items in it, shown in the debugger, but the .items accessor function returns an array with n-1 items in it, missing the current navigation item, which is what I want to check. backItem returns the n-2 item instead of the n-1, etc. The didPopItem item is the 'n+1' item so that doesn't help either.

How do I access the current UINavigationItem?

I'm using the iPhone 3.0 SDK.

解决方案

It seems that the "items" property will be adjusted after returning RunLoop.So try like this.

-(void)XXX:(UINavigationBar*)nBar {
    UINavigationItem *cItem = [nBar.items objectAtIndex:(nBar.items.count - 1)];
}

-(void)navigationBar:(UINavigationBar *)nBar didPopItem:(UINavigationItem *)item {
    [ self performSelector:@selector(XXX) withObject:nBar afterDelay:0 ];
}

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