iphone - 子类化实现 MKMapViewDelegate 的类，但未调用 MKMapViewDelegate 方法

Question

我正在子类化一个实现 MKMapViewDelegate 的类.我还将代表设置在 super 类中，但我的 -(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation方法未被调用。这是我的代码

我的父类(super class)代码

 //  RecentPhotosMapViewController.h
 @interface RecentPhotosMapViewController : UIViewController <MKMapViewDelegate>

     @property (nonatomic,strong) NSArray *annotations;
     @property(nonatomic,weak) IBOutlet MKMapView *mapView;

@end


 //  RecentPhotosMapViewController.m
- (void)viewDidLoad{

      [super viewDidLoad];
// Do any additional setup after loading the view.

    // load annotation data



       self.mapView.delegate = self;
}

  - (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:    (id<MKAnnotation>)annotation{

MKAnnotationView *aView = [mapView dequeueReusableAnnotationViewWithIdentifier:@"MapVC"];

     // safety code
     if(!aView){
         aView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"MapVC"];
         aView.canShowCallout = YES;
         aView.leftCalloutAccessoryView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];
         aView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

      }
     aView.annotation = annotation;
    [(UIImageView *)aView.leftCalloutAccessoryView setImage:nil];

    return aView;
}

我的子类代码

     //  RecentPhotosMapViewControllerWithAnnotationData.h
     @interface RecentPhotosMapViewControllerWithAnnotationData : RecentPhotosMapViewController
     @end

RecentPhotosMapViewControllerWithAnnotationData.m 文件

      -(void) viewDidLoad{


// extract annotation data.....
// set zoom level


[super viewDidLoad];

}

但是-(void) mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view method is called

感谢任何帮助

Answer 1

尝试将 [super viewDidLoad]; 移动为子类中 viewDidLoad 的第一行。

当您调用设置委托(delegate)的[super viewDidLoad]时，一切都已经发生了。