iOS-定位当前城市

1.导入框架

 
 
import 
 
 

2.定义对象

 @property(nonatomic,strong)CLLocationManager *locationManager;
 

3.开始定位

 //定位服务
 -(void)LocationService
 {
 
 
if ([CLLocationManager locationServicesEnabled]) {
    // 初始化定位管理器
    self.locationManager=[[CLLocationManager alloc]init];
    self.locationManager.delegate=self;
    // 设置定位精确度到千米
    self.locationManager.desiredAccuracy=kCLLocationAccuracyKilometer;
    // 设置过滤器为无
    self.locationManager.distanceFilter=kCLDistanceFilterNone;
    //这句话ios8以上版本使用
    [ self.locationManager requestAlwaysAuthorization];
    //开始定位
    [ self.locationManager startUpdatingLocation];
} else {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"无法定位" message:@"请检查你的设备是否开启定位功能" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
    [alert show];
}
 
 
}
 

4.代理方法

 
 
pragma mark--定位代理
 
 
 
  
 
(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
 {
 
// 获取当前所在的城市名
 CLGeocoder *geocoder = [[CLGeocoder alloc] init];
 //根据经纬度反向地理编译出地址信息
 [geocoder reverseGeocodeLocation:newLocation completionHandler:^(NSArray*array, NSError *error){
 if (array.count > 0){
 CLPlacemark *placemark = [array objectAtIndex:0];
 
      //获取城市
      NSString \*city = placemark.locality;
      if (!city) {
          //四大直辖市的城市信息无法通过locality获得，只能通过获取省份的方法来获得（如果city为空，则可知为直辖市）
          city = placemark.administrativeArea;
      }
      NSLog(@"city = %@", city);
      self.cityLabel.text=city;
 
 
 
 
 
//
 }
 else if (error == nil && [array count] == 0)
 {
 NSLog(@"No results were returned.");
 }
 else if (error != nil)
 {
 NSLog(@"An error occurred = %@", error);
 }
 }];
 //系统会一直更新数据，直到选择停止更新，因为我们只需要获得一次经纬度即可，所以获取之后就停止更新
 [manager stopUpdatingLocation];
 }