Ios 在通知回调中设置时，标签栏项目上不显示徽章

当我的应用程序收到通知时，我正在尝试将我的选项卡栏中的徽章设置为第四个选项卡上的“1”。奇怪的是，我的控制台说该方法正在启动（请参阅NSLog“Fire！”），但是一旦收到通知，该标记就不会出现在我的选项卡栏项目上？我错过什么了吗

AppDelegate.m

-(void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo 

    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateActive) {

        [[NSNotificationCenter defaultCenter] postNotificationName:@"pushNotification" object:nil userInfo:userInfo];

        NSLog(@"App notification received!");
        // do stuff when app is active

    }else{
        // do stuff when app is in background

        static int i=1;
        [UIApplication sharedApplication].applicationIconBadgeNumber = i++;

        NSLog(@"App notification received background!");
    }
}

- (void) myNotificationReceived:(NSNotification *) notification {


    [[self.tabBarController.tabBar.items objectAtIndex:3] setBadgeValue:@"1"];


    NSLog(@"Fire!");
}


- (void)viewDidLoad {
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myNotificationReceived:) name:@"pushNotification" object:nil];

}

ViewController.m

-(void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo 

    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateActive) {

        [[NSNotificationCenter defaultCenter] postNotificationName:@"pushNotification" object:nil userInfo:userInfo];

        NSLog(@"App notification received!");
        // do stuff when app is active

    }else{
        // do stuff when app is in background

        static int i=1;
        [UIApplication sharedApplication].applicationIconBadgeNumber = i++;

        NSLog(@"App notification received background!");
    }
}

- (void) myNotificationReceived:(NSNotification *) notification {


    [[self.tabBarController.tabBar.items objectAtIndex:3] setBadgeValue:@"1"];


    NSLog(@"Fire!");
}


- (void)viewDidLoad {
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myNotificationReceived:) name:@"pushNotification" object:nil];

}

---

[[self.tabBarController.tabBar.items objectAtIndex:0]setBadgeValue:nil]；将计数或数字设置为零，以显示在选项卡栏上

---

试试这个，它可能会帮助您

[[self.tabBarController.tabBar.items objectAtIndex:0]setBadgeValue:nil]；将计数或数字设置为零，以显示在选项卡栏上

---

尝试此方法可能会帮助您

无需NSNotification方法-以下内容修复了AppDelegate.m中的问题：

-(void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo {

    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateActive) {

        [[NSNotificationCenter defaultCenter] postNotificationName:@"pushNotification" object:nil userInfo:userInfo];

        UITabBarController *tabController = (UITabBarController *)self.window.rootViewController;
        [[tabController.viewControllers objectAtIndex:4] tabBarItem].badgeValue = @"1";


        NSLog(@"App notification received!");
        // do stuff when app is active

    }else{


        static int i=1;
        [UIApplication sharedApplication].applicationIconBadgeNumber = i++;

        //  NSLog(@"App notification received!");

        NSLog(@"App notification received background!");
    }
}

---

不需要NSNotification方法-以下方法修复了AppDelegate.m中的问题：

-(void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo {

    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateActive) {

        [[NSNotificationCenter defaultCenter] postNotificationName:@"pushNotification" object:nil userInfo:userInfo];

        UITabBarController *tabController = (UITabBarController *)self.window.rootViewController;
        [[tabController.viewControllers objectAtIndex:4] tabBarItem].badgeValue = @"1";


        NSLog(@"App notification received!");
        // do stuff when app is active

    }else{


        static int i=1;
        [UIApplication sharedApplication].applicationIconBadgeNumber = i++;

        //  NSLog(@"App notification received!");

        NSLog(@"App notification received background!");
    }
}

---

几点建议：从

viewDidLoad

调用

[[self.tabBarController.tabBar.items objectAtIndex:4]setBadgeValue:@“1”]

时会发生什么？这行是从主线程调用的吗？你有更多的。。。tab可能？“包含>=5项”

objectAtIdex:

会引发越界索引异常。请尝试此[[self.tabBarController.tabBar.items objectAtIdex:2]setBadgeValue:@“1”]；1是否出现在硬编码索引中？请注意，您正在尝试设置第5个选项卡，而不是第4个。@BashirSidani尝试过这个，但仍然没有出现“1”。尽管如此，我的NSLog“Fire！”仍然显示在控制台中，这让我相信该方法已经执行。一些建议：调用

[[self.tabBarController.tabBar.items objectAtIndex:4]setBadgeValue:@“1”]

from

viewDidLoad

时会发生什么？这行是从主线程调用的吗？你有更多的。。。tab可能？“包含>=5项”

objectAtIdex:

会引发越界索引异常。请尝试此[[self.tabBarController.tabBar.items objectAtIdex:2]setBadgeValue:@“1”]；1是否出现在硬编码索引中？请注意，您正在尝试设置第5个选项卡，而不是第4个。@BashirSidani尝试过这个，但仍然没有出现“1”。尽管如此，我的NSLog“Fire！”仍然显示在控制台中，这让我相信该方法已经执行。