Automatically obtain the current location (GPS positioning) in iOS development)

Automatically obtain the current location (GPS positioning) in iOS development)

 

 

 

Development Environment xcode5.0

 

First, we need to introduce this framework CoreLocation. framework

Import this library # import

And his proxy method CLLocationManagerDelegate

 

 

GPSViewController. h

Note that the CLLocationManager * locationmanager must be set to a global variable. Otherwise, you will not be able to get the desired result! Why? I still don't know.

 

#import 
 
  #import 
  
   @interface GPSViewController : UIViewController
   
    @property(nonatomic,retain) CLLocationManager* locationmanager;@end
   
  
 

GPSViewController. m

 

 

# Import GPSViewController. h @ interface GPSViewController () @ end @ implementation GPSViewController @ synthesize locationmanager;-(id) initWithNibName :( NSString *) bundle :( NSBundle *) Detail {self = [super initWithNibName: nibNameOrNil bundle: nibBundleOrNil]; if (self) {// Custom initialization} return self;}-(void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view. locationmanager = [[CLLocationManager alloc] init]; // set the precision/* kCLLocationAccuracyBest precise locating accuracy * // set the positioning precision [locationmanager setDesiredAccuracy: kCLLocationAccuracyBest]; // implement the locationmanager protocol. delegate = self; NSLog (@ start locating); // start locating [locationmanager startUpdatingLocation];}

# Pragma mark locationManager delegate-(void) locationManager :( CLLocationManager *) manager didUpdateToLocation :( CLLocation *) newLocation fromLocation :( CLLocation *) oldLocation {NSLog (@ hello ); // print the accuracy and latitude CLLocationCoordinate2D coordinate = newLocation. coordinate; NSLog (@ output current precision and latitude); NSLog (@ precision: % f latitude: % f, coordinate. latitude, coordinate. longpolling); // stop locating [locationmanager stopUpdatingLocation]; // calculate the float distance = [newLocation distanceFromLocation: oldLocation]; NSLog (@ distance % f, distance );} @ end