隐藏UIToolBar上的UIBarButtonItem
If you're trying to hide a UIBarButtonItem, you'll actually have to modify the contents of the parent bar. If it's a UIToolBar, you'll need to set the bar's items array to an array that doesn't include your item.
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NSMutableArray ? ? *items = [[myToolbar.items mutableCopy] autorelease];?[items removeObject: myButton];?myToolbar.items = items;?