How to detect another MKAnnotaion pin when touch - ios

Question

I have multiple annotation pin in map(place1,place2)
I want user touch pin to go to new Viewcontroller to get description of place
it have function to detect in pin to touch it to go to descriptionViewController?
This is my code
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
MKCoordinateRegion place1 = { {0.0, 0.0} , {0.0, 0.0} };
place1.center.latitude = 34.7037755;
place1.center.longitude = 137.7345882;
place1.span.longitudeDelta = 0.02f;
place1.span.latitudeDelta = 0.02f;
[mapView setRegion:place1 animated:YES];
Newclass *ann1 = [[Newclass alloc] init];
ann1.title = #"Place1";
ann1.subtitle = #"subtitle";
ann1.coordinate = place1.center;
[mapView addAnnotation: ann1];
MKCoordinateRegion place2 = { {0.0, 0.0} , {0.0, 0.0} };
place2.center.latitude = 34.7024461;
place2.center.longitude = 137.7297572;
place2.span.longitudeDelta = 0.02f;
place2.span.latitudeDelta = 0.02f;
[mapView setRegion:place2 animated:YES];
Newclass *ann2 = [[Newclass alloc] init];
ann2.title = #"place2";
ann2.subtitle = #"subtitle";
ann2.coordinate = place2.center;
[mapView addAnnotation:ann2];
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
MKPinAnnotationView *myPin = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:#"current"];
myPin.pinColor = MKPinAnnotationColorGreen;
UIButton *advertButtom = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[advertButtom addTarget:self action:#selector(button:) forControlEvents:UIControlEventTouchUpInside];
myPin.rightCalloutAccessoryView = advertButtom;
myPin.draggable =NO;
myPin.animatesDrop =true;
myPin.canShowCallout=YES;
return myPin;
}
-(void)button:(id)sender{
NSUserDefaults *defults = [NSUserDefaults standardUserDefaults];
UIStoryboard *storyboard = [self storyboard];
descriptionViewController *description = [storyboard instantiateViewControllerWithIdentifier:#"des"];
[self presentModalViewController:description animated:YES];
NSLog(#"touched");
NSLog(#"data %#");
}

Answer 1

You need to use mapView method
func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
NSUserDefaults *defults = [NSUserDefaults standardUserDefaults];
UIStoryboard *storyboard = [self storyboard];
descriptionViewController *description = [storyboard instantiateViewControllerWithIdentifier:#"des"];
[self presentModalViewController:description animated:YES];
NSLog(#"touched");
NSLog(#"data %#");
}