地图定位

 CLLocationManager *locationManager = [[CLLocationManager alloc]init];

locationManager.delegate = self;

设置精确度

    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    locationManager.distanceFilter = 10;

    [locationManager requestAlwaysAuthorization];

[locationManager startUpdatingLocation];

遵循的代理：CLLocationManagerDelegate

实现的方法：

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

    CLLocation *location = [locations objectAtIndex:0];

    通过位置对象，获取带有用户经纬度的结构体

    CLLocationCoordinate2D lc2d =location.coordinate;

    获取经纬度

    CLLocationDegrees lat = lc2d.latitude;纬度

    CLLocationDegrees longt = lc2d.longitude; 经度

    NSLog(@"纬度:%f 经度:%f",lat,longt);

    CLGeocoder * geoCoder = [[CLGeocoder alloc] init];

    [geoCoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {

        for (CLPlacemark * placemark in placemarks) {

           

            NSDictionary *test = [placemark addressDictionary];

              Country(国家)  State(城市)  SubLocality(区)

            NSLog(@"%@", [test objectForKey:@"State"]);

            self.stateString = [[test objectForKey:@"State"] substringWithRange:NSMakeRange(0, [[test objectForKey:@"State"] length] - 1)];

            NSLog(@"%@",self.stateString);

            UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:self.stateString style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];

            self.navigationItem.rightBarButtonItem = rightButton;

            NSLog(@"error:%@",error.localizedDescription);

        }

    }];

}

当用户拒绝程序访问gps功能，或者定位失败时，调用此方法

-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error

{

    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"城市" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];

    self.navigationItem.rightBarButtonItem = rightButton;

    NSLog(@"error:%@",error.localizedDescription);

   

}