Question

我正在尝试将UIBarButtonItems添加到显示为弹出窗口的导航控制器中。我似乎无法添加按钮，我想知道是否有人可以帮助我。

这是我到目前为止的代码：

UINavigationController* navigationController = [[UINavigationController alloc] initWithRootViewController:aStudentsViewController];

[navigationController setToolbarHidden:NO];
[navigationController setNavigationBarHidden:NO];

UIBarButtonItem *myButton = [[UIBarButtonItem alloc] initWithTitle:@"All Present"
                                                            style:UIBarButtonItemStylePlain
                                                           target:self
                                                           action:@selector(makeAllPresent:)];  



[navigationController.navigationItem setRightBarButtonItem:myButton];

attendancePopoverController = [[UIPopoverController alloc] initWithContentViewController:navigationController];
[attendancePopoverController setDelegate:self];


//activeBarButtonItem = sender;
[attendancePopoverController presentPopoverFromBarButtonItem:attendanceButton
                                permittedArrowDirections:UIPopoverArrowDirectionAny
                                                animated:YES];

Answer 1

UINavigationController期望按钮被附加到视图控制器以用于当前显示的视图（当您使用UINavigationController导航时，该按钮特定于每个视图）。 UIViewController有一个navigationItem属性，你需要附加你的按钮，通常在显示的视图控制器的viewDidLoad方法中。

在你的aStudentsViewController类中定义一个viewDidLoad方法并在那里设置按钮：

- (void)viewDidLoad {
    UIBarButtonItem *myButton = [[UIBarButtonItem alloc] initWithTitle:@"All Present"
                                                         style:UIBarButtonItemStylePlain
                                                         target:self
                                                         action:@selector(makeAllPresent:)];  
    self.navigationItem.rightBarButtonItem = myButton;
}

您也可以通过在类外部设置aStudentsViewController上的rightBarButtonItem来实现，但我认为您无法确定navigationItem对象何时可用。虽然如此：

aStudentsViewController.navigationItem.rightBarButtonItem = myButton;

我认为它不会起作用，直到弹出窗口导致一切都加载，但我不是很确定。最好的方法是将它放在aStudentsViewController对象的viewDidLoad中。

Answer 2

只需在viewDidLoad方法中使用

self.navigationItem.rightBarButtonItem = self.editButtonItem;

或任何按钮

希望有所帮助

Answer 3

     UIBarButtonItem *myButton = [[UIBarButtonItem alloc] initWithTitle:@"All Present"
                                                        style:UIBarButtonItemStylePlain
                                                       target:self
                                                       action:@selector(makeAllPresent:)];  

     UIViewController *vc = [[UIViewController alloc] initWithNibName:nil bundle:nil];
     vc.navigationItem.title = @"Your Title";
     vc.navigationItem.rightBarButtonItem =myButton;

     UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:vc];
    navigationController.navigationBar.hidden = NO;

     attendancePopoverController = [[UIPopoverController alloc] initWithContentViewController:navigationController];

希望它能帮到你..

将BarButtonItem添加到Popover中的导航控制器

3 个答案: