MKAnnotationView不顯示標題

Question

我設置標題兩個MKAnnotationView：

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

if(([annotation isKindOfClass:[Test_flag class]])) 
{ 

    MKAnnotationView *pinView = nil; 

    if(annotation != mapView.userLocation) 
    { 
     static NSString *defaultPinID = @"PinId1"; 
     pinView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID]; 
     if (pinView == nil) pinView = [[[MKAnnotationView alloc] 
              initWithAnnotation:annotation reuseIdentifier:@"pin1"] autorelease]; 
     pinView.canShowCallout = YES; 
     pinView.animatesDrop = YES; 
     [pinView setImage:[UIImage imageNamed:@"flg.png"]]; 
     [pinView setSelected:YES animated:YES]; 

    } 
    else 
    { 
     [mapView.userLocation setTitle:@"I am here"]; 
    } 
    return pinView; 
} 
else if(([annotation isKindOfClass:[Distance1 class]])) 
{ 
    MKAnnotationView *pinView = nil; 

    if(annotation != mapView.userLocation) 
    { 
     static NSString *defaultPinID = @"PinId4"; 
     pinView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID]; 
     if (pinView == nil) pinView = [[[MKAnnotationView alloc] 
              initWithAnnotation:annotation reuseIdentifier:@"pin4"] autorelease]; 

     pinView.canShowCallout = YES; 
     [pinView setImage:[UIImage imageNamed:@"Circle_Grey.png"]]; 
     [pinView setSelected:YES animated:YES]; 

    } 
    else 
    { 
     [mapView.userLocation setTitle:@"I am here"]; 
    } 
    return pinView; 
} 

當我觸摸地圖，無論是MKAnnotationView被指出，但他們不顯示標題。是什麼原因？請幫我找。

Answer 1

你錯過了寫title方法Test_flag類。