Question

当我的应用程序进入后台时，AppDelegate不会收听来自APNS的新推送通知。但奇怪的是，它并不是一直都在发生。有时候它有效，有时则不然。我无法弄清楚原因。

以下是我收听APNS通知的示例代码

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
    {
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:(UIRemoteNotificationTypeBadge
                                                                                             |UIRemoteNotificationTypeSound
                                                                                             |UIRemoteNotificationTypeAlert) categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    }
    else
    {
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeSound | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert)];
    }

    if (launchOptions != nil)
    {
        NSDictionary *dictionary = [launchOptions objectForKey:UIApplicationLaunchOptionsRemoteNotificationKey];
        if (dictionary != nil)
        {
        }
    }
    return YES;
}

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
{
    NSLog(@"Received notification: %@", userInfo);
    [self application:application didReceiveRemoteNotification:userInfo fetchCompletionHandler:nil];
}

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
    NSLog(@"Received notification background: %@", userInfo);
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 5 * NSEC_PER_SEC),
                   dispatch_get_main_queue(), ^{
                       // Check result of your operation and call completion block with the result
                       completionHandler(UIBackgroundFetchResultNewData);
                   });
}

- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {
    [application registerForRemoteNotifications];
}

Answer 1

在后台/关闭模式下，不会执行任何代码，也不会调用任何委托方法。此时推送通知由操作系统本身处理。应用程序徽章由来自服务器端的推送通知有效负载值设置。 如果您没有在后台获取应用程序徽章，则是服务器端的徽章编号问题。检查推送通知有效内容是否包含应用程序徽章字段并设置为大于0的值。

This link有同样的问题并解决了。

Answer 2

尝试改变你的行..

    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge|UIUserNotificationTypeAlert|UIUserNotificationTypeSound categories:nil]];
} else {
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert|UIRemoteNotificationTypeBadge|UIRemoteNotificationTypeSound];
}

在iOS 8中你必须使用＆＃34; UIUserNotificationTypeBadge＆＃34; ...

希望这对你有用..

AppDelegate没有收听APNS推送通知

2 个答案: