如何在iPhone上獲取GPS位置

Question

你能告訴我，我怎樣才能在iPhone中獲得GPS位置。

謝謝。

Answer 1

實施CLLocationManagerDelegate寫此功能，在你的viewController的viewDidLoad方法調用它。

-(void)startLocationManager 
{ 
    CLLocationManager *locationManager = [[CLLocationManager alloc] init]; 
    locationManager.delegate=self; 
    locationManager.desiredAccuracy=kCLLocationAccuracyBestForNavigation; 
    [locationManager startUpdatingLocation]; 
} 

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{  
    CLLocationCoordinate2D coordinate = [newLocation coordinate]; 
    double dblLatitude = coordinate.latitude; 
    double dblLongitude = coordinate.longitude;  
} 

Answer 2

您使用CoreLocation框架。 這裏你可以得到示例代碼http://mobileorchard.com/hello-there-a-corelocation-tutorial/

Answer 3

如果您使用CLLocationmanager，請確保您檢查是否首先啓用位置服務。我想這樣做是爲了獲得當前位置：

if ([CLLocationManager locationServicesEnabled]) 
{ 
    CLLocationManager *locationManager = [[CLLocationManager alloc] init]; 
    [locationManager startUpdatingLocation]; 

    CLLocationCoordinate2D *currentLocation = locationManager.location; 

    [locationManager stopUpdatingLocation]; 
    [locationManager release]; 
} 

如果您正在使用的MapView，您可以用獲取當前位置：

[mapView setShowsUserLocation:YES]; 
CLLocationCoordinate2D *currentLocation = mapView.userLocation.coordinate;