如何让GPS应用程序在没有停顿的情况下在后台运行 [英] How to keep GPS app running in background without pauses

问题描述

我在保持GPS在后台运行时遇到问题。

当应用程序处于后台时，我成功保持GPS运行，但有时会停止。我注意到，当我进入建筑物时停下来，我在那里呆了2-3个小时。 停止意味着即使位置服务图标仍然打开，我仍未收到任何GPS点。然后当我离开时，我没有收到任何积分，直到我将应用程序带到前台。

我将pausesLocationUpdatesAutomatically属性设置为NO。

所以，一切工作正常，直到我进入一个弱gps信号的位置。当我离开那个区域时，我不再收到积分，即使我应该因为gps信号现在好。

这里是我的代码，当应用程序进入后台：

   - （void）applicationWillResignActive：（UIApplication *）application 
 {
 NSLog @[AppDelegate]：应用程序进入后台！）; 
 if（doesUserWantGPSTracking）
 {
 [self stopGPS]; 
 
 UIApplication * app = [UIApplication sharedApplication]; 
 
 bgTask = [app beginBackgroundTaskWithExpirationHandler：
 ^ {
 
 dispatch_async（dispatch_get_main_queue（），
 ^ {
 
 if bgTask！= UIBackgroundTaskInvalid）
 {
 [app endBackgroundTask：bgTask]; 
 bgTask = UIBackgroundTaskInvalid; 
} 
 
}）; 
 
}]; 
 $ b dispatch_async（dispatch_get_global_queue（DISPATCH_QUEUE_PRIORITY_DEFAULT，0），
 ^ {
 
 [self startGPS]; 
 
 dispatch_async（dispatch_get_main_queue（）， ^ b 
 
 bgTask = UIBackgroundTaskInvalid 
 
 
 $ 
}）; 
 
}）; 
} 
} 
  

解决方案

您的信息plist，添加所需的背景模式

并将一个项目设置为应用程序寄存器位置更新

更新：

随着ios返回到 - （void）locationManager：（CLLocationManager *）manager didUpdateToLocation：（CLLocation *）newLocation fromLocation：（CLLocation *）oldLocation 当距离发生显着变化时。我想你需要改变：

  //设置移动阈值​​。 
 locationManager.distanceFilter = 500; //米
  

I have a problem keeping the GPS running in background.

I succeded to keep the GPS running when the app is in background, but it stops sometimes. I noticed that it stops when i enter in a building and i stay there for 2-3 hours. "Stops" means that i don't receive any GPS point even though the location service icon is still on. Then when i get out i don't receive any points until I bring my application to foreground.

I set the pausesLocationUpdatesAutomatically property to NO.

So, everything works fine until i get into a location with weak gps signal. When i get out of that area i don't receive points anymore, even though I should because the gps signal is now good.

And here is my code when the applications enters in background:

- (void)applicationWillResignActive:(UIApplication *)application
{
    NSLog(@"[AppDelegate]: Application entering in background!");
    if(doesUserWantGPSTracking)
    {
    [self stopGPS];

    UIApplication *app = [UIApplication sharedApplication];

    bgTask = [app beginBackgroundTaskWithExpirationHandler:
              ^{

                    dispatch_async(dispatch_get_main_queue(),
                    ^{

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

                    });

              }];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
        ^{

            [self startGPS];

            dispatch_async(dispatch_get_main_queue(), ^{

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

            });

        });
    }
    }

解决方案

In your info plist, add Required background modes

and set one item to App registers for location updates

Updated:

As ios return to - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation when there is a significant distance change. I guess you need to change:

// Set the movement threshold.
locationManager.distanceFilter = 500; // meters

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