iOS 後臺定位CoreLocation CLLocationManager

需求：要求APP定時向服務器上傳自己的位置

1.配置

1.1 將Capablities中的BackgroundMode勾選未ON 並且勾選其中的Location updates選項

1.2 權限設置

Privacy - Location When In Use Usage Description

Privacy - Location Always Usage Description

2. 初始化

導入   #import <CoreLocation/CoreLocation.h>

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

這裏後臺保持持續定位有兩種方式

第一種 

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

直接設置這個就可以實現後臺定位  但是有個缺點   app進入後臺後會有一個藍色狀態條

第二種

判斷權限

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

- (void)requestAlwaysAuthorization     // 總是給予授權
- (void)requestWhenInUseAuthorization; // 在前臺才定位

這個在iOS11之後要求添加Privacy - Location Always and When In Use Usage Description權限

否則進入後臺後就不定位了  

3. 代理方法

默認每秒定位一次  

也就是每秒調用一次

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

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

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)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;
    } 
}


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