iOS后台定位，实时向服务器发送最新位置

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"后台定位";

    self.locationManager = [[CLLocationManager alloc] init];

    self.locationManager.delegate = self;

    [self.locationManager setDesiredAccuracy:kCLLocationAccuracyBest];

    if ([[UIDevice currentDevice].systemVersion floatValue] > 8)
    {
         /** 请求用户权限：分为：只在前台开启定位  /在后台也可定位， */

         /** 只在前台开启定位 */
//        [self.locationManager requestWhenInUseAuthorization];

         /** 后台也可以定位 */
        [self.locationManager requestAlwaysAuthorization];
    }

    if ([[UIDevice currentDevice].systemVersion floatValue] > 9)
    {
         /** iOS9新特性：将允许出现这种场景：同一app中多个location manager：一些只能在前台定位，另一些可在后台定位（并可随时禁止其后台定位）。 */
        [self.locationManager setAllowsBackgroundLocationUpdates:YES];
    }

     /** 开始定位 */
    [self.locationManager startUpdatingLocation];
}

#pragma mark -  定位代理方法
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
    CLLocation *loc = [locations objectAtIndex:0];

    NSLog(@"经纬度  %f  %f ",loc.coordinate.latitude,loc.coordinate.longitude);

    NSURLSession *session = [NSURLSession sharedSession];

    NSURLSessionDataTask *task = [session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://ac.ybjk.com/ua.php"]] completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
//        NSLog(@"response  %@",response);

        NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

        NSLog(@"result %@",result);
    }];

    [task resume];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end