{
  self.locationManager = [[CLLocationManager alloc] init];
  _locationManager.delegate = self;
  if([CLLocationManager locationServicesEnabled] == NO) {
   //  NSLog(@"沒有GPS服務(wù)");
  }
  //地理位置精確度
  _locationManager.desiredAccuracy=kCLLocationAccuracyNearestTenMeters;
  //設(shè)置距離篩選器,double類型,只要距離變化多少,就調(diào)用委托代理
  self.locationManager.distanceFilter = kCLDistanceFilterNone; // meters
  [_locationManager requestWhenInUseAuthorization];// 前臺定位
  [_locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager
   didUpdateLocations:(NSArray *)locations
{
  NSLog(@"longitude = %f", ((CLLocation *)[locations
                       lastObject]).coordinate.longitude);
  NSLog(@"latitude = %f", ((CLLocation *)[locations lastObject]).coordinate.latitude);
    CGFloat longTI=((CLLocation *)[locations
                    lastObject]).coordinate.longitude;
    CGFloat latTI=((CLLocation *)[locations lastObject]).coordinate.latitude;
    //將經(jīng)度顯示到label上
    _longitudeLabel.text = [NSString stringWithFormat:@"%f",longTI];
    //將緯度現(xiàn)實(shí)到label上
    _latitudeLabel.text = [NSString stringWithFormat:@"%f",latTI];
  // 獲取當(dāng)前所在的城市名
  CLGeocoder *geocoder = [[CLGeocoder alloc] init];
  //根據(jù)經(jīng)緯度反向地理編譯出地址信息
  [geocoder reverseGeocodeLocation:locations.lastObject completionHandler:^(NSArray *array, NSError *error)
   {
     if (array.count > 0)
     {
       CLPlacemark *placemark = [array objectAtIndex:0];
//       //將獲得的所有信息顯示到label上
//       self.location.text = placemark.name;
       //獲取城市
       NSString *city = placemark.locality;
       if (!city) {
         //四大直轄市的城市信息無法通過locality獲得，只能通過獲取省份的方法來獲得（如果city為空，則可知為直轄市）
         city = placemark.administrativeArea;
       }
      // NSLog(@"city = %@", city);
       _cityName=city;
     }
     else if (error == nil && [array count] == 0)
     {
      // NSLog(@"No results were returned.");
     }
     else if (error != nil)
     {
      // NSLog(@"An error occurred = %@", error);
     }
   }];
  //系統(tǒng)會一直更新數(shù)據(jù)，直到選擇停止更新，因?yàn)槲覀冎恍枰@得一次經(jīng)緯度即可，所以獲取之后就停止更新
  [manager stopUpdatingLocation];
}