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[英]"Cancel" button (UIBarButtonItem) not working in iOS view controller
[英]iOS: Removed cancel button reappears after using search controller
我在我的应用程序中使用ABPeoplePickerNavigationController,并使用UINavigationControllerDelegate将导航栏按钮改写为我自己的按钮。
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
navigationController.topViewController.searchDisplayController.searchBar.barStyle = UIBarStyleBlack;
navigationController.topViewController.navigationItem.leftBarButtonItem = nil;
navigationController.topViewController.navigationItem.rightBarButtonItem = nil;
UIBarButtonItem *cancelButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
target:self
action:@selector(cancel:)];
navigationController.topViewController.navigationItem.leftBarButtonItem = cancelButtonItem;
UIBarButtonItem *addButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target:self
action:@selector(addItem:)];
navigationController.topViewController.navigationItem.rightBarButtonItem = addButtonItem;
}
这很好。 但是,当我使用搜索控制器退出其中时,右上角的按钮突然变为“取消”按钮(请参见下图)。 我怎样才能解决这个问题? 提前致谢。
好的,只是想出了解决方法。 我刚刚添加了一条通知,以查看何时隐藏键盘,并将按钮添加回导航栏。
1)声明并综合属性mainNavigationController:
@property UINavigationController *mainNavigationController;
2)在(void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController动画化:(BOOL)动画中,添加:
mainNavigationController = navigationController;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onNotification:) name:UIKeyboardWillHideNotification object:nil];
3)添加onNotification方法:
-(void)onNotification:(NSNotification*)notification
{
UIBarButtonItem *addButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target:self
action:@selector(addItem:)];
mainNavigationController.topViewController.navigationItem.rightBarButtonItem = addButtonItem;
}
要解决此问题,您必须实现<UISearchDisplayDelegate>
并在navigationController:willShowViewController:animated:
方法中,将searchDisplayController的委托设置为self viewController.searchDisplayController.delegate = self;
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