如何在后台保持iphone ios websocket连接活着？

Question

我使用SocketRocket创建了一个聊天应用程序,当我退出应用程序(进入后台模式)时,我想收到聊天消息!所以我可以通过称之为VoIP应用程序来做到这一点,但有些人说苹果将拒绝它从App Store,除非它也真的做VoIP.那么我怎么能这样做呢？如果这样做的唯一方法是将它称为VoIP应用程序whatsapp如何处理这种情况？

以下是我在后台保持应用程序活动的方法:

- (void)applicationDidEnterBackground:(UIApplication *)application
{


 NSLog(@"Application entered background state.");
    NSAssert(self.backgroundTask == UIBackgroundTaskInvalid, nil);
    self.didShowDisconnectionWarning = NO;

self.backgroundTask = [application beginBackgroundTaskWithExpirationHandler: ^{
    dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"Background task expired");
        if (self.backgroundTimer)
        {
            [self.backgroundTimer invalidate];
            self.backgroundTimer = nil;
        }
        [application endBackgroundTask:self.backgroundTask];
        self.backgroundTask = UIBackgroundTaskInvalid;
    });
}];

dispatch_async(dispatch_get_main_queue(), ^{
    self.backgroundTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(timerUpdate:) userInfo:nil repeats:YES];
});

}


- (void) timerUpdate:(NSTimer*)timer {
    UIApplication *application = [UIApplication sharedApplication];

    NSLog(@"Timer update, background time left: %f", application.backgroundTimeRemaining);

    if ([application backgroundTimeRemaining] < 60 && !self.didShowDisconnectionWarning)
    {
        UILocalNotification *localNotif = [[UILocalNotification alloc] init];
        if (localNotif) {
            localNotif.alertBody = @"Background session will expire in one minute.";
            localNotif.alertAction = @"OK";
            localNotif.soundName = UILocalNotificationDefaultSoundName;
            [application presentLocalNotificationNow:localNotif];
        }
        self.didShowDisconnectionWarning = YES;
    }
    if ([application backgroundTimeRemaining] < 10)
    {
        // Clean up here
        [self.backgroundTimer invalidate];
        self.backgroundTimer = nil;

        [application endBackgroundTask:self.backgroundTask];
        self.backgroundTask = UIBackgroundTaskInvalid;
    }

}

Answer 1

我相信你唯一的选择是使用远程通知.您需要您的应用程序注册它们,并且您的服务器要检测您的应用程序何时未运行(即通过套接字连接),然后发送通知.