使用CLLocationCoordinate2D获取当前位置

Question

I am trying to get current location of user using CLLocationCoordinate2D. I want the values in the format like

CLLocationCoordinate2D start = {-28.078694,153.382844 };

So that I can use them like following:

 NSString *urlAddress = [NSString 
       stringWithFormat:@"http://maps.google.com/?saddr=%1.6f,%1.6f&daddr=%1.6f,%1.6f",  
       start.latitude, start.longitude, 
       destination.latitude, destination.longitude];  

I used

CLLocation *location = [[CLLocation alloc]init ];
CLLocationDegrees currentLatitude = location.coordinate.latitude;
CLLocationDegrees currentLongitude = location.coordinate.longitude;

to get current lat & long.

But I am getting 0.000 for both when I try to test. I am testing on iPhone 4s.

If there is any sample code, it will be great.

Answer 1

Add CoreLocation framework first and then use the following code...and your viewController must implement CLLocationManagerDelegate

-(void)findCurrentLocation
{

    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    if ([locationManager locationServicesEnabled])
    {
        locationManager.delegate = self; 
        locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
        locationManager.distanceFilter = kCLDistanceFilterNone; 
        [locationManager startUpdatingLocation];
    }


    CLLocation *location = [locationManager location];
    CLLocationCoordinate2D coordinate = [location coordinate];

    NSString *str=[[NSString alloc] initWithFormat:@" latitude:%f longitude:%f",coordinate.latitude,coordinate.longitude];
    NSLog(@"%@",str);


}

Answer 2

in AppDelegate.h declare following variable. and implement

CLLocationManagerDelegate delegate.

CLLocationManager *locationManager;
CLLocation *currentLocation;

in AppDelegate.hm file write following code.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {       

    self.locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    self.currentLocation = newLocation;
    self.currentLat =  newLocation.coordinate.latitude; 
    self.currentLong =  newLocation.coordinate.longitude; 
}

Answer 3

CLLocationCoordinate2D location = [[[mapview userLocation] location] coordinate];  
NSLog(@"Location found from Map: %f %f",location.latitude,location.longitude);

and also refer the link(without mapview0

https://developer.apple.com/library/ios/#samplecode/LocateMe/Introduction/Intro.html

Answer 4

You need to use CLLocationManager to get a user's location. CLLocation is only a class of objects used to represent locations, it can't get user location by it self.

For more details and example, please follow to Apple docs on Location Awareness Programming .

Answer 5

使用位置管理器来获取经度和纬度，请按照本教程中的示例代码http://www.edumobile.org/iphone/miscellaneous/how-to-get-current-latitude-and-longitude-in-iphone/

Answer 6

-(void)findCurrentLocation
{
    if ([CLLocationManager locationServicesEnabled])
    {
        CLLocationManager *locationManager = [[CLLocationManager alloc] init];
        locationManager.delegate = self;
        locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        locationManager.distanceFilter = kCLDistanceFilterNone;
        [locationManager startUpdatingLocation];
    }
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    [self setLocation:[[manager location] coordinate]];
}