当应用程序在后台时向服务器发送纬度和经度 [英] Sending Latitude and Longitude to Server when app is in background

问题描述

我浏览了这么多链接，即使在那之后我还没有找到获取纬度和经度的合适解决方案.

I have gone through so many links, even after that I haven't found a proper solution for getting latitude and longitude.

定期 iOS 后台位置更新

带有位置"的iOS长时间运行后台计时器后台模式

我尝试了一些链接和论坛，但它只工作了 3 分钟，然后应用程序根本没有更新用户位置.

I tried from some links and forums but it is working for only 3 mins, then app is not at all updating the user location.

- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.


//create new uiBackgroundTask
__block UIBackgroundTaskIdentifier bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
    [app endBackgroundTask:bgTask];
    bgTask = UIBackgroundTaskInvalid;
}];

//and create new timer with async call:
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{

    [locationManager startUpdatingLocation];

    NSTimer* t = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(startTrackingBg) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:t forMode:NSDefaultRunLoopMode];
    [[NSRunLoop currentRunLoop] run];
});

}
 -(void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
//  store data
CLLocation *newLocation = [locations lastObject];


//tell the centralManager that you want to deferred this updatedLocation
if (_isBackgroundMode && !_deferringUpdates)
{
    _deferringUpdates = YES;
    [locationManager allowDeferredLocationUpdatesUntilTraveled:CLLocationDistanceMax timeout:10];
}
}

推荐答案

好的.

在挣扎了 3 天之后，即使在 3 分钟后，当应用程序处于后台时，它也可以发送纬度和经度.

After struggling for 3days, it is working for me for sending latitude and longitude when app is in background even after 3 mins.

我检查了我的应用程序，在后台连续发送 lat long 一个多小时.

I checked my app, continuously sending lat long for more than a hour in background.

它至少可以帮助一些人.

It can help some one at least.

首先请在您的 pList 中添加以下两个键.

First Please add below two keys in your pList.

 1.NSLocationAlwaysUsageDescription
 2.NSLocationWhenInUseUsageDescription

两者都是字符串，你可以给任何值.

Bothe are strings and you can give any value.

然后请在项目部分的功能下打开后台获取并检查位置更新.

Then please turn on background fetch and check location updates under capabilities in project section.

然后导入 Corelocation 框架并添加以下代码.

Then import Corelocation framework and add this below code.

locationManager 是一个全局变量.

locationManager is a global variable.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
 //create CLLocationManager variable
locationManager = [[CLLocationManager alloc] init];
//set delegate
locationManager.delegate = self;

app = [UIApplication sharedApplication];
// This is the most important property to set for the manager. It ultimately determines how the manager will
// attempt to acquire location and thus, the amount of power that will be consumed.

if ([locationManager respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) {
    [locationManager setAllowsBackgroundLocationUpdates:YES];
}
locationManager.desiredAccuracy = 45;
locationManager.distanceFilter = 100;
// Once configured, the location manager must be "started".
[locationManager startUpdatingLocation];
}

 - (void)applicationWillResignActive:(UIApplication *)application {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

[locationManager stopUpdatingLocation];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
[locationManager setDistanceFilter:kCLDistanceFilterNone];
locationManager.pausesLocationUpdatesAutomatically = NO;
locationManager.activityType = CLActivityTypeAutomotiveNavigation;
[locationManager startUpdatingLocation];
 }

 - (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.


[locationManager stopUpdatingLocation];

__block UIBackgroundTaskIdentifier bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
    bgTask = UIBackgroundTaskInvalid;
}];

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10.0
                                              target:self
                                            selector:@selector(startTrackingBg)
                                            userInfo:nil
                                             repeats:YES];


 }

-(void)startTrackingBg {

[locationManager startUpdatingLocation];
 NSLog(@"App is running in background");
}
 //starts automatically with locationManager
  -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
latitude=newLocation.coordinate.latitude;
longitude=newLocation.coordinate.longitude;
NSLog(@"Location: %f, %f",newLocation.coordinate.longitude, newLocation.coordinate.latitude);
 }

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