Question

我的应用是带有许多导航控制器的标签栏应用。我希望这些导航控制器使用自定义右键控制按钮来处理登录/注销操作。所以我在AppDelegate中以这种方式设置我的标签栏：

MyFirstViewController *firstViewController = [[MyFirstViewController alloc] init];
UIViewController *firstNavigationController = [[CustomNavigationController alloc]
                                               initWithRootViewController:firstViewController];

MySecondViewController *secondViewController = [[MySecondViewController alloc] init];
UIViewController *secondNavigationController = [[CustomNavigationController alloc]
                                               secondViewController]
                                               initWithRootViewController:secondViewController];

....

[tabBarController setViewControllers:@[firstNavigationController, secondNavigationController]];

然后CustomNavigationController：

@implementation ConnectionNavigationController

- (void) viewDidLoad 
{
    [self displayConnectionButton];
}

- (void) displayConnectionButton
{
    UIImage *portraitImage, *landscapeImage;
    portraitImage = [UIImage imageNamed:@"conn.png"];
    landscapeImage = [UIImage imageNamed:@"connLandscape.png"];

    UIBarButtonItem *connButton = [[UIBarButtonItem alloc]
                                   initWithImage:[portraitImage
                                                  imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                                   landscapeImagePhone:[landscapeImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                                   style:UIBarButtonItemStylePlain target:self action:@selector(showConnectionPopup)];
    self.navigationItem.rightBarButtonItem = connButton;
}

@end

我尝试使用viewDidLoad，viewDidAppear，viewWillAppear但没有任何效果，我无法在导航栏中显示此按钮。我还尝试添加reloadInputViews或setNeedsDisplay。我该怎么办？

感谢您的帮助

编辑：CustomNavigationController的界面

@interface ConnectionNavigationController : UINavigationController

- (void) displayConnectionButton;

@end

Answer 1

根据我的理解，您应该将displayConnectionButton方法添加到相关的UIViewController子类而不是UINavigationController子类，因为它只包含视图控制器的堆栈。

E.g。

@implementation MyFirstViewController

- (void) viewDidLoad 
{
    [self displayConnectionButton];
}

- (void) displayConnectionButton
{
    UIImage *portraitImage, *landscapeImage;
    portraitImage = [UIImage imageNamed:@"conn.png"];
    landscapeImage = [UIImage imageNamed:@"connLandscape.png"];

    UIBarButtonItem *connButton = [[UIBarButtonItem alloc]
                                   initWithImage:[portraitImage
                                                  imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                                   landscapeImagePhone:[landscapeImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
                                   style:UIBarButtonItemStylePlain target:self action:@selector(showConnectionPopup)];
    self.navigationItem.rightBarButtonItem = connButton;
}

@end

请注意，如果您在displayConnectionButton和CustomNavigationController po self.viewControllers上放置断点，我认为您将获得一个空数组（即没有视图控制器）

右键无法在自定义导航控制器中显示

1 个答案: