iPhone - UIViewController 中的工具栏在显示后立即消失
我使用此代码在 UIViewController 中显示一项工具栏（由 UINavigationController 推送）。工具栏出现然后立即消失：
UIBarButtonItem * logoutButton = [[UIBarButtonItem alloc] initWithTitle:@"Log out" style:UIBarButtonItemStylePlain target:self action:nil];
NSMutableArray * arr = [NSMutableArray arrayWithObjects:logoutButton, nil];
[self setToolbarItems:arr animated:NO];
[self.navigationController setToolbarHidden:NO animated:NO];
你知道问题出在哪里吗？
I use this code to display a one item Toolbar in UIViewController (which is pushed by UINavigationController). The toolbar shows up and immediately disappear:
UIBarButtonItem * logoutButton = [[UIBarButtonItem alloc] initWithTitle:@"Log out" style:UIBarButtonItemStylePlain target:self action:nil];
NSMutableArray * arr = [NSMutableArray arrayWithObjects:logoutButton, nil];
[self setToolbarItems:arr animated:NO];
[self.navigationController setToolbarHidden:NO animated:NO];
Do you know what the problem is?
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这段代码在哪里？这里似乎没有什么不寻常的地方，所以要么与你调用它的位置有关，要么与之后发生的其他事情有关（例如稍后将toolbarHidden设置为YES或其他东西）
where is this code? Doesn't seem to be anything out of the ordinary here so either has to do with where you are calling it, or something else that happens afterwards (like setting toolbarHidden to YES later or something)