后台定位服务在 iOS 7 中不起作用 [英] Background Location Services not working in iOS 7

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本文介绍了后台定位服务在 iOS 7 中不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我最近升级了我的 iOS 设备以使用 iOS 7.我们正在开发的应用之一使用后台位置服务来跟踪设备位置,我们所有的测试人员都报告说该应用似乎不再在iOS 7 下的背景.

I've recently upgraded my iOS devices to use iOS 7. One of the apps that we're developing uses background location services to track device location and all of our testers have reported that the app no longer appears to track in the background under iOS 7.

我们已经验证在设备的设置中启用了应用程序的后台,并且之前的版本在 iOS 6 下运行完美.即使设备被循环,应用程序也会在位置更新后重新启动.

We have verified that backgrounding for the app is enabled in the settings on the device and the previous build worked flawlessly under iOS 6. Even if the device were cycled, the app would restart after a location update.

是否还需要做其他事情才能在 iOS 7 下完成这项工作?

Is there something else that needs to be done to make this work under iOS 7?

推荐答案

这里是我用来从 iOS 7 设备获取连续位置的解决方案,无论是在前台还是后台.

Here is the solution that I used to get continuous location from iOS 7 devices no matter it is in foreground or background.

您可以从博客和 github 中找到完整的解决方案和解释:-

You may find the full solution and explanation from blog and also github:-

  1. iOS 7 和 8 的后台位置更新编程

Github 项目:iOS 7 和 8 的后台位置更新编程

方法和说明:-

  1. 我在 didUpdateLocations

我允许位置管理器在关闭设备前 10 秒钟从设备获取位置信息(以节省电池).

I allow the location manager to get the locations from the device for 10 seconds before shut it down (to save battery).

部分代码如下:-

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{

for(int i=0;i<locations.count;i++){
    CLLocation * newLocation = [locations objectAtIndex:i];
    CLLocationCoordinate2D theLocation = newLocation.coordinate;
    CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;
    NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];

    if (locationAge > 30.0)
        continue;

    //Select only valid location and also location with good accuracy
    if(newLocation!=nil&&theAccuracy>0
       &&theAccuracy<2000
       &&(!(theLocation.latitude==0.0&&theLocation.longitude==0.0))){
        self.myLastLocation = theLocation;
        self.myLastLocationAccuracy= theAccuracy;
        NSMutableDictionary * dict = [[NSMutableDictionary alloc]init];
        [dict setObject:[NSNumber numberWithFloat:theLocation.latitude] forKey:@"latitude"];
        [dict setObject:[NSNumber numberWithFloat:theLocation.longitude] forKey:@"longitude"];
        [dict setObject:[NSNumber numberWithFloat:theAccuracy] forKey:@"theAccuracy"];
        //Add the vallid location with good accuracy into an array
        //Every 1 minute, I will select the best location based on accuracy and send to server
        [self.shareModel.myLocationArray addObject:dict];
    }
}

//If the timer still valid, return it (Will not run the code below)
if (self.shareModel.timer)
    return;

self.shareModel.bgTask = [BackgroundTaskManager sharedBackgroundTaskManager];
[self.shareModel.bgTask beginNewBackgroundTask];

//Restart the locationMaanger after 1 minute
self.shareModel.timer = [NSTimer scheduledTimerWithTimeInterval:60 target:self
                                                       selector:@selector(restartLocationUpdates)
                                                       userInfo:nil
                                                        repeats:NO];

//Will only stop the locationManager after 10 seconds, so that we can get some accurate locations
//The location manager will only operate for 10 seconds to save battery
NSTimer * delay10Seconds;
delay10Seconds = [NSTimer scheduledTimerWithTimeInterval:10 target:self
                                                selector:@selector(stopLocationDelayBy10Seconds)
                                                userInfo:nil
                                                 repeats:NO];
 }

2014 年 5 月更新:我收到了一些添加示例代码的请求,以便在特定时间间隔内将位置发送到服务器.我添加了示例代码,并结合了 BackgroundTaskManager 的修复程序,以解决后台长时间运行的故障.如果您有任何问题,欢迎您在这里加入我们的讨论:iOS 7 的后台位置更新编程与服务器讨论的位置更新

Update on May 2014: I got a few requests for adding sample codes on sending the location to server for a certain time interval. I have added the sample codes and also combined a fix for BackgroundTaskManager to solve a glitch for background running over an extended period of time. If you have any questions, you are welcomed to join us for a discussion here: Background Location Update Programming for iOS 7 with Location Update to Server Discussion

2015 年 1 月更新:如果您想在应用暂停时获取位置更新,请参阅:即使在暂停时也获取 iOS 应用的位置更新

Update on January 2015: If you want to get the location update even when the app is suspended, please see: Get Location Updates for iOS App Even when Suspended

这篇关于后台定位服务在 iOS 7 中不起作用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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