标签栏项目上的徽章未显示

Question

在我的应用程序中，我的tabBar项目的badge值在AppDelegate.m设置，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"];
    ...
}

问题是：徽章值始终为“ 1”。 为什么在applicationWillEnterForeground:和applicationDidBecomeActive:设置的徽章值永远不会显示？ 如果我没有在application: didFinishLaunchingWithOptions:设置徽章值application: didFinishLaunchingWithOptions:那么那里没有徽章显示。

Answer 1

您需要阅读UIApplicationDelegate协议以及各种状态转换。 仅当电话中发生一组状态更改时，applicationDidBecomeActive过渡不会在启动时发生。

Answer 2

@Meno谢谢哥们。 它为我工作。

只需复制粘贴

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

在viewDidLoad 。