標簽欄項目上的徽章未顯示

Question

在我的應用程序中，我的tabBar項目的badge值在AppDelegate.m設置，如下所示：

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    ...
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    UITabBarController *tabBarController = [storyboard instantiateViewControllerWithIdentifier:@"tabBarController"]; 
    [[tabBarController.tabBar.items objectAtIndex:4] setBadgeValue:@"1"];
    ...
}

- (void)applicationWillEnterForeground:(UIApplication *)application
{
    ...
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    UITabBarController *tabBarController = [storyboard instantiateViewControllerWithIdentifier:@"tabBarController"]; 
    [[tabBarController.tabBar.items objectAtIndex:4] setBadgeValue:@"2"];
    ...
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    ...
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    UITabBarController *tabBarController = [storyboard instantiateViewControllerWithIdentifier:@"tabBarController"]; 
    [[tabBarController.tabBar.items objectAtIndex:4] setBadgeValue:@"3"];
    ...
}

問題是：徽章值始終為“ 1”。 為什么在applicationWillEnterForeground:和applicationDidBecomeActive:設置的徽章值永遠不會顯示？ 如果我沒有在application: didFinishLaunchingWithOptions:設置徽章值application: didFinishLaunchingWithOptions:那么那里沒有徽章顯示。

Answer 1

您需要閱讀UIApplicationDelegate協議以及各種狀態轉換。 僅當電話中發生一組狀態更改時，applicationDidBecomeActive過渡不會在啟動時發生。

Answer 2

@Meno謝謝哥們。 它為我工作。

只需復制粘貼

[[tabBarController.tabBar.items objectAtIndex:4] setBadgeValue:@"2"]; 

在viewDidLoad 。