如何在用户点击Objective C中的myLocation按钮时执行操作？

Question

我是iOS新手，我正在面临关于获取用户当前城市信息的问题，当点击mycurrenLocation按钮时我还需要用户当前的经纬度。

为图像中，当我点击这个当前位置的按钮，我需要当前的经纬度，并当前城市的名称的信息。这是可能的吗？如果是，如何做到这一点？

在此先感谢！

Answer 1

找位置，如果你拍了拍My location button以下的委托方法致电

• （BOOL）didTapMyLocationButtonForMapView：（GMSMapView中*）的MapView

，你会得到输出

，您可以通过

(lldb) po mapView.myLocation 
<+37.33243033,-122.03088128> +/- 386.93m (speed -1.00 mps/course -1.00) @ 5/19/14, 6:22:28 PM Moscow Standard Time 

Answer 2

您可以使用CoreLocation获取经度和纬度。

#import <CoreLocation/CoreLocation.h> 

CLLocationManager *locationManager; 
- (void)viewDidLoad 
{ 
    locationManager = [[CLLocationManager alloc] init]; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; 
    [locationManager startUpdatingLocation]; 
} 

然后

float latitude = locationManager.location.coordinate.latitude; 
float longitude = locationManager.location.coordinate.longitude; 

而且通过lattitude和logitude到谷歌的位置API，你会得到街道名称。

还要检查此链接：

Google current location API

Stackoverflow answer

Answer 3

你可以从didUpdateToLocation位置被调用，然后使用地理编码方法来获取位置

// this delegate is called when location is found 
- (void)locationManager:(CLLocationManager *)manager  didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
    // an MKReverseGeocoder is created to find a placemark coordinates 
    MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate]; 
    geoCoder.delegate = self; 
    [geoCoder start]; 
} 

// this delegate is called to convert into placemakrk 
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark 
{ 
    MKPlacemark * myPlacemark = placemark; 
    // we are now retrieving the city name 
    NSString *city = [myPlacemark.addressDictionary objectForKey: (NSString*) kABPersonAddressCityKey]; 
    } 

Answer 4

检查这个代码

在.h文件中导入CoreLocation框架

#import <CoreLocation/CoreLocation.h> 

.m文件

@interface yourViewController : UIViewController<CLLocationManagerDelegate> 
    { 
     CLLocationManager *locationManager; 
     CLLocation *currentLocation; 
    } 



- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    [self currentlocation]; 
} 


-(void)currentlocation 
{ 

    locationManager = [CLLocationManager new]; 
    locationManager.delegate = self; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    [locationManager startUpdatingLocation]; 

} 

第5步：使用此方法

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations 
{ 
    currentLocation = [locations objectAtIndex:0]; 
    [locationManager stopUpdatingLocation]; 
    CLGeocoder *geocoder = [[CLGeocoder alloc] init] ; 
    [geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) 
    { 
     if (!(error)) 
     { 
      CLPlacemark *placemark = [placemarks objectAtIndex:0]; 
      NSLog(@"\nCurrent Location Detected\n"); 
      NSLog(@"placemark %@",placemark); 
      NSString *locatedAt = [[placemark.addressDictionary valueForKey:@"FormattedAddressLines"] componentsJoinedByString:@", "]; 
      NSString *Address = [[NSString alloc]initWithString:locatedAt]; 
      NSString *Area = [[NSString alloc]initWithString:placemark.locality]; 
      NSString *Country = [[NSString alloc]initWithString:placemark.country]; 
      NSString *CountryArea = [NSString stringWithFormat:@"%@, %@", Area,Country]; 
      NSLog(@"%@",CountryArea); 
     } 
     else 
     { 
      NSLog(@"Geocode failed with error %@", error); 
      NSLog(@"\nCurrent Location Not Detected\n"); 
      //return; 
      CountryArea = NULL; 
     } 
     /*---- For more results 
     placemark.region); 
     placemark.country); 
     placemark.locality); 
     placemark.name); 
     placemark.ocean); 
     placemark.postalCode); 
     placemark.subLocality); 
     placemark.location); 
      ------*/ 
    }]; 
}