iOS后台位置不发送http请求

Question

我的应用需要在后台跟踪用户位置,但无法发送"获取"请求.当应用程序到达前台时,会立即发送http请求.我正在使用RestKit来处理所有网络请求,我按照本教程设置了我的后台位置服务.在我的applicationDidEnterBackground中

-(void)applicationDidEnterBackground:(UIApplication *)application
{
    self.bgLocationManager = [[CLLocationManager alloc] init];
    self.bgLocationManager.delegate = self;
    [self.bgLocationManager startMonitoringSignificantLocationChanges];
    NSLog(@"Entered Background");
}

我在applicationDidBecomeActive委托中停止监视有意义的位置变化

这是我的locationManager委托,我接受新的更新位置并发送到我的服务器

-(void) locationManager:(CLLocationManager *)manager 
    didUpdateToLocation:(CLLocation *)newLocation 
           fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"I am in the background");
    bgTask = [[UIApplication sharedApplication]
                beginBackgroundTaskWithExpirationHandler:
                ^{
                      [[UIApplication sharedApplication] endBackgroundTask:bgTask];
                 }];
                 // ANY CODE WE PUT HERE IS OUR BACKGROUND TASK

    NSString *currentLatitude = [[NSString alloc]
                                  initWithFormat:@"%g",
                                  newLocation.coordinate.latitude];
    NSString *currentLongitude = [[NSString alloc]
                                   initWithFormat:@"%g",
                                   newLocation.coordinate.longitude];
    NSString *webToken = [[NSUserDefaults standardUserDefaults] stringForKey:@"userWebToken"];
    NSLog(@"I am in the bgTask, my lat %@", currentLatitude);

    NSDictionary *queryParams;
    queryParams = [NSDictionary dictionaryWithObjectsAndKeys:webToken, @"auth_token",  currentLongitude, @"lng", currentLatitude, @"lat", nil];
    RKRequest* request = [[RKClient sharedClient] post:@"/api/locations/background_update" params:queryParams delegate:self];
    //default is RKRequestBackgroundPolicyNone
    request.backgroundPolicy = RKRequestBackgroundPolicyContinue;

    // AFTER ALL THE UPDATES, close the task

    if (bgTask != UIBackgroundTaskInvalid)
    {
        [[UIApplication sharedApplication] endBackgroundTask:bgTask];
        bgTask = UIBackgroundTaskInvalid;
    }
}

网络请求按计划运行,但不会在后台调用.我还需要其他步骤吗？在我的info.plist中,我有必需的背景模式键和位置服务作为值.

编辑

我也提到过去的答案.我通过在didUpdateToLocation调用中放置日志来运行一些测试并且它们都被调用但是没有发送'get'请求.相反,当我最终将应用程序启动到前台时,它会发送所有构建的网络请求(超过10个).

编辑(2)我在我的请求中添加了RKRequestBackgroundPolicyContinue,但它没有改变我的结果.(正如你可以看到这里在后台上传/下载restkit).我看到Restkit初始化主机但是在应用程序变为活动状态之前无法发送请求.

回答

RestKit必须做一些在后台禁止的事情.使用NSURLRequest非常有效.

NSMutableURLRequest * urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.example.com/api/locations/background_update"]];
[urlRequest setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[urlRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setHTTPBody:jsonData];

NSHTTPURLResponse  *response = nil;
[NSURLConnection sendSynchronousRequest:urlRequest
                      returningResponse:&response
                                  error:&error];

可以使用同步请求,因为没有UI可以破坏后台任务

Answer 1

重新创建原始建议作为答案

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您是否尝试过用库存同步 NSURLConnection 替换restKit 调用？\xe2\x80\x93 dklt 九月 20 日

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