故事板 - 如何定製UITabbarItem與裏面的UITabBarController UINavigationController的

Question

我有一個關於自定義UITabBarItem

首先的問題，您可以download my code demo

現在，我定製的UITabBarController在MyAppDelegate是：

-(void)configureiPhoneTabBar 
{ 
    tabViewController = (UITabBarController *)self.window.rootViewController; 
    UIViewController *controller1 = [[tabViewController viewControllers] objectAtIndex:0]; 
    [self configureTabBarItemWithImageName:@"home_ON.png" : @"home.png" andText:@"Home" forViewController:controller1]; 

    UIViewController *controller2 = [[tabViewController viewControllers] objectAtIndex:1]; 
    [self configureTabBarItemWithImageName:@"tvChannel_ON.png" : @"tvChannel.png" andText:@"TV" forViewController:controller2]; 
} 

-(void)configureTabBarItemWithImageName:(NSString*)imageName1 : (NSString*)imageName2 andText:(NSString *)itemText forViewController:(UIViewController *)viewController 
{ 
    UIImage* icon1 = [UIImage imageNamed:imageName1]; 
    UIImage* icon2 = [UIImage imageNamed:imageName2]; 

    UITabBarItem *item1 = [[UITabBarItem alloc] initWithTitle:itemText image:icon1 tag:0]; 
    [item1 setTitleTextAttributes:@{ UITextAttributeTextColor : [UIColor whiteColor] } 
         forState:UIControlStateNormal]; 
    [item1 setFinishedSelectedImage:icon1 withFinishedUnselectedImage:icon2]; 
    [viewController setTabBarItem:item1]; 
} 

我在UINavigationController裏面使用了一個UITabbarcontroller，並且我無法從appdelegate自定義uitabaritem，如果你運行代碼並在UITabBarController中檢查「initial」，界面顯示爲true，但是當在「in itial「很難做到這一點

Answer 1

移動代碼以將標籤欄自定義到LoginViewController（這是一個延伸到標籤欄控制器的標籤欄）。我將此代碼添加到該文件的末尾：

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    if ([segue.identifier isEqualToString:@"idenLogin"]) { 
     UITabBarController *tabViewController = segue.destinationViewController; 
     UIViewController *controller1 = [[tabViewController viewControllers] objectAtIndex:0]; 
     [self configureTabBarItemWithImageName:@"home_ON.png" : @"home.png" andText:@"Home" forViewController:controller1]; 
     UIViewController *controller2 = [[tabViewController viewControllers] objectAtIndex:1]; 
     [self configureTabBarItemWithImageName:@"tvChannel_ON.png" : @"tvChannel.png" andText:@"TV" forViewController:controller2]; 
    } 
} 


-(void)configureTabBarItemWithImageName:(NSString*)imageName1 : (NSString*)imageName2 andText:(NSString *)itemText forViewController:(UIViewController *)viewController { 
    UIImage* icon1 = [UIImage imageNamed:imageName1]; 
    UIImage* icon2 = [UIImage imageNamed:imageName2]; 

    UITabBarItem *item1 = [[UITabBarItem alloc] initWithTitle:itemText image:icon1 tag:0]; 
    [item1 setTitleTextAttributes:@{ UITextAttributeTextColor : [UIColor whiteColor] } 
         forState:UIControlStateNormal]; 
    [item1 setFinishedSelectedImage:icon1 withFinishedUnselectedImage:icon2]; 
    [viewController setTabBarItem:item1]; 
} 

Answer 2

如果您從登錄視圖控制器啓動您的應用程序，您可以從該初始viewController配置tabBarController。爲此，您可以在prepareForSegue，因爲你將不得不在segue.destinationViewController的指針tabBarController ...

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
    { 
     [self configureiPhoneTabBar:segue.destinationViewController]; 
    } 

移動你的tabBarViewController-配置代碼到這個的viewController ...

-(void)configureiPhoneTabBar:(UITabBarController*)tabViewController 
{ 
     // tabViewController = (UITabBarController *)self.window.rootViewController; 
    UIViewController *controller1 = [[tabViewController viewControllers] objectAtIndex:0]; 
     //...etc... 

或將configureiPhoneTabBar:發送給您的應用程序委託來完成配置（但確實最好將代碼保留在應用程序委託之外）。

更妙的是，你可以繼承UITabBarViewController，把你的配置代碼在那裏，viewDidLoad中觸發：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    [self configureiPhoneTabBar]; 
} 


-(void)configureiPhoneTabBar 
    { 
    UIViewController *controller1 = [[self viewControllers] objectAtIndex:0]; 

     ...etc... 

作爲另一種選擇，你可以在被加載到標籤欄的相應viewControllers找到配置代碼。