当我的应用程序在后台时，只有当我触摸顶部通知横幅时才会处理推送通知，而当我点击应用程序图标时不工作

Question

当收到推送通知时，我已经实现了application:didReceiveRemoteNotification:在我的应用程序中存储数据。
然而，当我的应用程序在后台，我收到通知时，只有当我触摸出现在顶部的通知横幅时，数据才会存储:

相反，如果我触摸应用程序图标重新打开它，通知的内容不会被存储:

application:didReceiveRemoteNotification:只在我将通知横幅推到顶部时被调用。

我使用了applicationWillEnterForeground和didFinishLaunchingWithOptions方法，同时单击应用程序图标并调试其进入applicationWillEnterForeground和控制无处可去。以下是didFinishLaunchingWithOptions、applicationWillEnterForeground和didReceiveRemoteNotification的代码。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    self.isForeground = YES;
    // Let the device know we want to receive push notifications
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
    storage= [[NSMutableArray alloc]init];
    if (launchOptions != nil) {
        // launched from notification item click
        NSDictionary *userInfo = [launchOptions objectForKey: UIApplicationLaunchOptionsRemoteNotificationKey];
        if (userInfo != nil) [self HandleNotification:userInfo];
    }
    return YES;
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    isForeground = YES;
    NSArray *subviews = [window subviews];
    for (int i = 0; i < [subviews count]; i++) {
        [[subviews objectAtIndex:i] removeFromSuperview];
    }
    //[self.window addSubview:tabBarController.view];
    [self.window makeKeyAndVisible];
    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    self.window.rootViewController = self.viewController; 
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    [self HandleNotification:userInfo]; 
}
- (void)HandleNotification:(NSDictionary *)userInfo {
    ApiWrapper *wrapper = [[ApiWrapper alloc] init];
    NSString *dteStr = [[NSString alloc] init];
    NSDate *nowdate = [NSDate date];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    //[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:@"Europe/London"]];
    [dateFormat setDateFormat:@"dd/MM/yyyy HH:mm:ss"];
    dteStr = [dateFormat stringFromDate:nowdate];
    [dateFormat release];
    NSString *notifId = [userInfo objectForKey:@"NotificationId"];
    NSData *test = self.strTest;
    NSString *strToken = [NSString stringWithFormat:@"%@", test];
    strToken = [strToken substringWithRange:NSMakeRange(1, [strToken length] - 2)];     
    [wrapper deviceResponse:notifId:dteStr:strToken];
    NSLog(@".....user info%@", userInfo);
    NSDictionary *pushInfo = [userInfo  objectForKey:@"aps"];
    NSString *alertstring = [pushInfo objectForKey:@"alert"];
    NSLog(@"Alertstring: %@", alertstring);
    [UIApplication sharedApplication].applicationIconBadgeNumber = [[[userInfo objectForKey:@"aps"] objectForKey: @"badgecount"] intValue];
    MLNotifMessage *objNotif = [[MLNotifMessage alloc] init];
    objNotif.notifText = alertstring;    
    NSDate *nowdate1 = [NSDate date];
    NSDateFormatter *dateFormat1 = [[NSDateFormatter alloc] init];
    //[dateFormat setTimeZone:[NSTimeZone timeZoneWithName:@"Europe/London"]];
    [dateFormat1 setDateFormat:@"dd/MM/yyyy HH:mm:ss"];
    objNotif.datenow = [dateFormat1 stringFromDate:nowdate1];
    [dateFormat1 release];
    NSLog(@"Date in delegate class is %@", objNotif.datenow);
    [storage addObject:objNotif];    
    if (self.isForeground) {
        NSArray *subviews = [window subviews];
        for (int i = 0; i < [subviews count]; i++) {
            [[subviews objectAtIndex:i] removeFromSuperview];
        }
        [self.window makeKeyAndVisible];
        self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
        self.window.rootViewController = self.viewController;
    }
}

Answer 1

如果点击主屏幕上的应用程序图标，则无法获得推送通知的数据。但是有一种方法，你可以在应用程序进入前台时向服务器发送一个小的有效载荷，然后要求服务器立即发送推送通知。

再看看这个:你的问题可能和它重复了。

Answer 2

一般来说，你的应用程序不应该需要推送通知的内容来正常运行。苹果甚至不能保证推送通知会被发送(如果设备不可用，它会删除除最新通知外的所有通知)。

你的应用程序应该始终与服务器通信，以获得用户数据的权威状态(或你呈现的任何数据)。如果你确实收到了推送通知，你当然可以将其作为更新或显示新信息的提示。但即使用户正常点击你的应用图标(因此没有通知)，你也应该联系服务器来获取或更新你需要的一切。

Answer 3

尽管这是一个较老的问题，但它在这个主题中排名很高，并且在iOS7中有一个解决方案。

有一个方法叫做application:didReceiveRemoteNotification:fetchCompletionHandler:即使你的应用程序在后台也会被调用。

我遇到的问题是它没有被调用。然后我找到了这篇文章，并意识到我必须在我的项目的功能中启用"远程通知"才能使其工作。