iOS：后台定位并实时向服务器发送位置

• 第一步：开启后台模式，选中定位，选择project --> capabilities-->Backgorund Modes --> Location updates 如图：

• 第二步：在info.list 文件中添加如下配置

允许 http 请求 ，ios 9 之后需要添加，便于向服务器发送请求
<key>NSAppTransportSecurity</key>
 <dict>
  <key>NSAllowsArbitraryLoads</key>
  <true/>
 </dict>

添加定位权限，ios8之后需要添加，否则无法定位
<key>NSLocationWhenInUseUsageDescription</key>
  <string>YES</string>
<key>NSLocationAlwaysUsageDescription</key>
  <string>YES</string>

• 第三步：代码如下

#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] > )     {
          /** 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] > )     {
          /** 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:];
      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

至此，完成后台实时定位功能，并向服务器发送请求成功。

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