【OC】CLLocationManager原生定位

当遇到定位需求，且项目无需引入高德、百度等地图SDK时，采用系统自带定位方法和反地理解析，可以很容易获取用户位置。

typedef void(^GetLocationSuccessBlock)(NSString *cityName);

@property (nonatomic ,strong) GetLocationSuccessBlock getLocationSuccess;
@property (nonatomic ,strong) CLLocationManager *locationManager;

/// 开始定位
- (void)getCurrentLocationSuccess:(GetLocationSuccessBlock)successBlock{
    
    self.getLocationSuccess = successBlock;
    
    [self initializeLocationService];
}

- (void)initializeLocationService {
    // 初始化定位管理器
    _locationManager = [[CLLocationManager alloc] init];
    // 设置代理
    _locationManager.delegate = self;
    // 设置定位精确度到米
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    // 设置过滤器为无
    _locationManager.distanceFilter = kCLDistanceFilterNone;
    // 开始定位
    // 取得定位权限，有两个方法，取决于你的定位使用情况
    // 一个是requestAlwaysAuthorization，一个是requestWhenInUseAuthorization
    [_locationManager requestWhenInUseAuthorization];//这句话ios8以上版本使用。
    [_locationManager startUpdatingLocation];
}

- (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];
            //将获得的所有信息显示到label上
            
            //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);
            
            if (self.getLocationSuccess) {
                self.getLocationSuccess(city);
            }
        }
        else if (error == nil && [array count] == 0)
        {
            NSLog(@"No results were returned.");
            if (self.getLocationSuccess) {
                self.getLocationSuccess(@"定位失败");
            }
        }
        else if (error != nil)
        {
            NSLog(@"An error occurred = %@", error);
            if (self.getLocationSuccess) {
                self.getLocationSuccess(@"定位失败");
            }
        }
    }];
    //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];
}