MKAnnotation viewForAnnotation never called - iphone

Question

I have already add UIViewController<MKMapViewDelegate> in .h and already add
-(void) viewDidLoad {
self.mapView.delegate = self;
}
but the method viewForAnnotation never called
MapViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface Tela1ViewController : UIViewController<MKMapViewDelegate> {
IBOutlet MKMapView *mapView;
}
#property (nonatomic, retain) MKMapView *mapView;
#end
MapViewController.m
-(void) viewDidLoad {
self.mapView.delegate = self;
}
- (void)viewDidAppear:(BOOL)animated
{
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication shared
mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
mapView.mapType = MKMapTypeSatellite;
CLLocationCoordinate2D coord = {latitude: appDelegate.latitude, longitude: appDelegate.longitude};
MKCoordinateSpan span = {latitudeDelta:0.2, longitudeDelta: 0.2};
MKCoordinateRegion region = {coord, span};
[mapView setRegion:region];
PlaceMark *addAnnotation = [[PlaceMark alloc] initWithCoordinate:coord];
[mapView addAnnotation:addAnnotation];
[self.view addSubview:mapView];
}
- (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation
{
NSLog(#"test");
}

Answer 1

Okay, couple of things to fix in your code ...
Delegate of MKMapView
Is nil. Why? Because you set delegate of MKMapView in viewDidLoad method. But when you look at viewDidAppear:, you're allocating new MKMapView and you're not setting delegate there. And because viewDidLoad is called before viewDidAppear:, delegate is simply nil = not set.
Calling super
When you override some methods, read documentation. Because you can find this in viewDidAppear: documentation for example:
You can override this method to perform additional tasks associated with presenting the view. If you override this method, you must call super at some point in your implementation.
MKMapView & IBOutlet
And also don't understand why do you have MKMapView as IBOutlet and then you're allocating new MKMapView and adding it as subview. Also if your IBOutlet is really connected to a MKMapView in your XIB, you'll end up with two MKMapViews, because the old one (from XIB) is not removed from superview.
You're clearly messing things up. Go and read more about UIKit, ...

Answer 2

Try replacing the last several lines of you viewDidAppear method with the following:
CLLocationCoordinate2D coord = {.latitude = location.latitude, .longitude = location.longitude};
MKCoordinateSpan span = {.latitudeDelta = 0.2, .longitudeDelta = 0.2};
MKCoordinateRegion region = {coord, span};
[mapView setRegion:region];
MapAnnotation *addAnnotation = [[MapAnnotation alloc] initWithCoordinate:coord];
[mapView addAnnotation:addAnnotation];
[self.view addSubview:mapView];