ios - 如何更新通知角标(Badge)号码？

Question

抱歉，因为我从 android 开发跳到 IOS 开发，我想知道收到通知时是否有任何函数会触发？或者我应该如何处理通知？

这是我应用中的应用委托(delegate)。问题是每当收到消息时，如果应用程序位于后台，它就不会触发 didReceiveNotification 函数，那么当应用程序位于后台时，如何更新角标(Badge)编号？谢谢

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [[NSNotificationCenter defaultCenter] addObserver: self
                                             selector: @selector(switch_tabbar)
                                                 name: @"switch_tabbar"
                                               object: nil];
    //self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
   // self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    [window setRootViewController:tabBarController];
  //  self.window.rootViewController = tabBarController;
    [self.window makeKeyAndVisible];

    NSLog(@"%@",@"launch");

    application.applicationIconBadgeNumber = 0;
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
    if(launchOptions!=nil){
        NSString *msg = [NSString stringWithFormat:@"%@", launchOptions];
        //NSLog(@"launch %@",msg);
        [self createAlert:msg];
    }

    NSArray *permissions = [[NSArray alloc] initWithObjects: @"publish_actions", nil];

    self.session = [[FBSession alloc] initWithPermissions:permissions];
    if (self.session.state == FBSessionStateCreatedTokenLoaded) {
        [self.session openWithCompletionHandler:^(FBSession *session,
                                                  FBSessionState status,
                                                  NSError *error) {

            [FBSession openActiveSessionWithReadPermissions:nil
                                               allowLoginUI:NO
                                          completionHandler:
             ^(FBSession *session,
               FBSessionState state, NSError *error) {
             }];

        }];
    }

    return YES;
}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    NSLog(@"%@",@"receive");
    application.applicationIconBadgeNumber = 0;
    NSString *msg = [NSString stringWithFormat:@"%@", userInfo];
    //NSLog(@"receive %@",msg);
    [self createAlert:msg];
}

- (void)createAlert:(NSString *)msg {
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Message Received" message:[NSString stringWithFormat:@"%@", msg]delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alertView show];
}

Answer 1

在 iOS 中收到推送通知时，角标(Badge)计数会自动增加，我们无需在应用中更新角标(Badge)计数，

ApplePushService

iOS 中的推送通知格式

{
    "aps" : {
        "alert" : "You got your emails.",
        "badge" : 9,
        "sound" : "bingbong.aiff"
    },
    "acme1" : "bar",
    "acme2" : 42
}

注意:“角标(Badge)”值必须为整数