如何在AppDelegate中触发navigationController:willShowViewController委托方法

发布于 2024-12-06 04:42:45 字数 978 浏览 0 评论 0原文

如何为下面的实现触发 navigationController:willShowViewController 委托方法，以便导航控制器中的所有视图控制器都符合 colorWithHexString #faf6f5？

目前，我的 FirstViewController 将被显示，但它似乎不会调用委托方法来更改其导航栏的颜色（以及随后堆叠到导航控制器上的所有其他视图控制器）。请注意，我已经将“UINavigationControllerDelegate”添加到我的应用程序委托头文件中。

//In App Delegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //Set First View
    FirstViewController *firstView = [[FirstViewController alloc]init];

    // pushes a nav con 
    UINavigationController *tempNavcon = [[UINavigationController alloc]initWithRootViewController:firstView];
    self.navcon = tempNavcon;

    [self.window addSubview:navcon.view];

}

- (void)navigationController:(UINavigationController *)navigationController 
  willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{

    navigationController.navigationBar.tintColor = [UIColor colorWithHexString:@"#faf6f5"];

}

原文

How can I trigger the navigationController:willShowViewController delegate method for my implementation below so that all the view controllers in the navigation controller will conform to the colorWithHexString #faf6f5?

Currently, my FirstViewController will be displayed but it doesn't seem to call the delegate method to change the color of it's navigation bar (as well as for all other view controllers that are stacked onto the navigation controller subsequently). Note that I have already added the "UINavigationControllerDelegate" to my app delegate header file.

//In App Delegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //Set First View
    FirstViewController *firstView = [[FirstViewController alloc]init];

    // pushes a nav con 
    UINavigationController *tempNavcon = [[UINavigationController alloc]initWithRootViewController:firstView];
    self.navcon = tempNavcon;

    [self.window addSubview:navcon.view];

}

- (void)navigationController:(UINavigationController *)navigationController 
  willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{

    navigationController.navigationBar.tintColor = [UIColor colorWithHexString:@"#faf6f5"];

}

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趁微风不噪 2024-12-13 04:42:45

您尝试在事件方法中而不是在创建 UINavigationBar 实例时更改tintColor 是否有原因？

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猫弦 2024-12-13 04:42:45

操作方法如下。（请注意，UIColor 不接受十六进制值；您应该使用 RGB 值，或检查此页。

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //Initialize your view controller.
    FirstViewController * firstView = [[FirstViewController alloc] init];

    // Create an instance of a UINavigationController. Its stack contains only firstView.
    UINavigationController *navController = [[UINavigationController alloc]
                                             initWithRootViewController:firstView];

    //Here is where you set the color of the navigationBar. See my note above for using RGB.
    navController.navigationBar.tintColor = [UIColor greenColor];

    // You can now release the firstView here, navController will retain it
    [firstView release];

    // Place navigation controller's view in the window hierarchy
    [[self window] setRootViewController:navController];

    [navController release];

    [self.window makeKeyAndVisible];
    return YES;
}

Here's how you do it. (Note that UIColor doesn't accept hex values; you should use an RGB value, or check this page.

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //Initialize your view controller.
    FirstViewController * firstView = [[FirstViewController alloc] init];

    // Create an instance of a UINavigationController. Its stack contains only firstView.
    UINavigationController *navController = [[UINavigationController alloc]
                                             initWithRootViewController:firstView];

    //Here is where you set the color of the navigationBar. See my note above for using RGB.
    navController.navigationBar.tintColor = [UIColor greenColor];

    // You can now release the firstView here, navController will retain it
    [firstView release];

    // Place navigation controller's view in the window hierarchy
    [[self window] setRootViewController:navController];

    [navController release];

    [self.window makeKeyAndVisible];
    return YES;
}

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