how to use Map or mapkit in Ios

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@interface ViewController : UIViewController<MKMapViewDelegate,CLLocationManagerDelegate>{
    MKPointAnnotation *point;
}
@property (nonatomic,strong)CLLocationManager *locationManager;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@end

-----------------------------------
- (void)viewDidLoad {
    [super viewDidLoad];
    _locationManager = [[CLLocationManager alloc]init];
    [_locationManager requestWhenInUseAuthorization];
    _locationManager.delegate=self;
    [_locationManager startUpdatingLocation];
    _mapView.showsUserLocation = YES;
   
   
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressHandler:)];
    longPress.minimumPressDuration = 1.5;
    [self.mapView addGestureRecognizer:longPress];
   
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}




-(void)showCurrentLocation{

}




-(void)moveMapToUserLocation{
   
    //***********Move Map to the Center using SerCenter Method
//    [_mapView setCenterCoordinate:_mapView.userLocation.location.coordinate animated:YES];
   
   
    //**********Alternate Way Using Region
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(_mapView.userLocation.location.coordinate, 100, 100);
    [_mapView setRegion:region];
   

}

-(void)addAnnotaionCoordinate:(CLLocationCoordinate2D)locationCoordinate{
    if(point){
        [point setCoordinate:locationCoordinate];
        return;
    }
    point = [[MKPointAnnotation alloc] init];
    point.coordinate = locationCoordinate;
    point.title = @"Where am I?";
    point.subtitle = @"I'm here!!!";

    [_mapView addAnnotation:point];

}



- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    [self moveMapToUserLocation];

}


-(void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views{
   
}
-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
    NSLog(@"Annotation did Selected : %@ At location : %f,%f",view.reuseIdentifier,view.annotation.coordinate.latitude,view.annotation.coordinate.longitude);
}


-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView *pinView = nil;
    if(annotation != _mapView.userLocation) {


        static NSString *defaultPinID = @"myLocation";
        pinView = (MKAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinView == nil )
            pinView = [[MKAnnotationView alloc]
                       initWithAnnotation:annotation reuseIdentifier:defaultPinID];
       
        pinView.canShowCallout = YES;
        pinView.image = [UIImage imageNamed:@"pin.png"];
    }
    return pinView;
}

//Called when Loading of Map is completed
-(void)mapViewDidFinishLoadingMap:(MKMapView *)mapView{
    [self addAnnotaionCoordinate:_mapView.userLocation.location.coordinate];
}

-(void)longPressHandler:(UILongPressGestureRecognizer*)sender{
    CGPoint pntLongPress = [sender locationInView:_mapView];
   
    //Conversion of CGPoint to CLLocationCoordinate2D
    CLLocationCoordinate2D locationOfLongPress = [_mapView convertPoint:pntLongPress toCoordinateFromView:_mapView];
   
    [self addAnnotaionCoordinate:locationOfLongPress];
}
@end