iOS 后台定位CoreLocation CLLocationManager

需求：要求APP定时向服务器上传自己的位置

1.配置

1.1 将Capablities中的BackgroundMode勾选未ON 并且勾选其中的Location updates选项

1.2 权限设置

Privacy - Location When In Use Usage Description

Privacy - Location Always Usage Description

2. 初始化

导入   #import

 _lcManager = [[CLLocationManager alloc] init];
    
 _lcManager.delegate = self;
 _lcManager.desiredAccuracy = kCLLocationAccuracyBest;
 _lcManager.pausesLocationUpdatesAutomatically = NO;

这里后台保持持续定位有两种方式

第一种 

    if ([_lcManager respondsToSelector:@selector(setAllowsBackgroundLocationUpdates:)]) {
        [_lcManager setAllowsBackgroundLocationUpdates:YES];
    }

直接设置这个就可以实现后台定位  但是有个缺点   app进入后台后会有一个蓝色状态条

第二种

判断权限

    if ([_lcManager respondsToSelector:@selector(requestAlwaysAuthorization)])
    {
        [_lcManager requestAlwaysAuthorization];
        [_lcManager requestWhenInUseAuthorization];
    }

- (void)requestAlwaysAuthorization     // 总是给予授权
- (void)requestWhenInUseAuthorization; // 在前台才定位

这个在iOS11之后要求添加Privacy - Location Always and When In Use Usage Description权限

否则进入后台后就不定位了  

3. 代理方法

默认每秒定位一次  

也就是每秒调用一次

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

 定位成功
 
 @param manager <#manager description#>
 @param locations <#locations description#>
 */

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
    
    CLLocation *location = [locations lastObject];
    double lat = location.coordinate.latitude;
    double lng = location.coordinate.longitude;
    
    
  

    NSLog(@"------lat:%f, ------lng:%f", lat, lng);
    
    if (!self.deferringUpdates) {
        
        [_lcManager allowDeferredLocationUpdatesUntilTraveled:500 timeout:10];
        
        self.deferringUpdates = YES;
    } 
}


/**
 定位失败
 
 @param manager <#manager description#>
 @param error <#error description#>
 */
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    self.deferringUpdates = NO;
}