ios:mapKit viewForAnnotation从PIN中消失弹出标题？

我正在尝试使用MapKit创建带有标题弹出窗口的Dragable自定义pin。但是，当我实现viewForAnnotation以使PIN显示为自定义图像时，其弹出标题将消失，就像我在地图上点击PIN一样，它不会显示titla弹出窗口

虽然如果我评论viewForAnnotation效果很好，但我需要自定义图像和点击pin时弹出的标题

下面是代码

- (void)viewDidLoad
{
     MKCoordinateRegion newRegion = MKCoordinateRegionMakeWithDistance(LocCoordinate, 20000, 20000); 
     DDAnnotation *point = [[DDAnnotation alloc] init];
     [point setCoordinate:mapCenter];
     [point setTitle:@"Where am I"];
     [point setSubtitle:@"I am here"];

     [self.mvTripMap addAnnotation:point];        
     [self.mvTripMap setRegion:newRegion animated:YES];

     [super viewDidLoad];
}

-(MKAnnotationView *)mapView:(MKMapView *)MapView viewForAnnotation:(id<MKAnnotation>)annotation{
    static NSString *cabAnnotationIdentifier=@"cabAnnotationIdentifier";
    MKAnnotationView *annotationView=[MapView dequeueReusableAnnotationViewWithIdentifier:cabAnnotationIdentifier];
    if(!annotationView){            
        annotationView=[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:cabAnnotationIdentifier];
        annotationView.image=[UIImage imageNamed:@"start.png"];             
        annotationView.draggable = YES; 
    }
    return annotationView;
}

---

只需放置

annotationView.canShowCallout=YES和它将工作

更新代码

-(MKAnnotationView *)mapView:(MKMapView *)MapView viewForAnnotation:(id<MKAnnotation>)annotation{
    static NSString *cabAnnotationIdentifier=@"cabAnnotationIdentifier";
    MKAnnotationView *annotationView=[MapView dequeueReusableAnnotationViewWithIdentifier:cabAnnotationIdentifier];
    if(!annotationView){            
        annotationView=[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:cabAnnotationIdentifier];
        annotationView.image=[UIImage imageNamed:@"start.png"];             
        annotationView.draggable = YES; 
        annotationView.canShowCallout= YES;
    }
    return annotationView;
}

-（MKAnnotationView*）地图视图：（MKMapView*）地图视图注释：（id）注释{
静态NSString*cabAnnotationIdentifier=@“cabAnnotationIdentifier”；
MKAnnotationView*annotationView=[MapView dequeueReusableAnnotationViewWithIdentifier:cabAnnotationIdentifier]；
如果（！annotationView）{
annotationView=[[MKAnnotationView alloc]initWithAnnotation:annotation重用标识符：cabAnnotationIdentifier]；
annotationView.image=[UIImage ImageName:@“start.png”]；
annotationView.draggable=是；
annotationView.canShowCallout=是；
}
返回注释视图；
}

#import "DDAnnotation.h"

@implementation DDAnnotation

@synthesize coordinate = coordinate_;
@synthesize title = title_;
@synthesize subtitle = subtitle_;

- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate addressDictionary:(NSDictionary *)addressDictionary {

    if ((self = [super initWithCoordinate:coordinate addressDictionary:addressDictionary])) {
        self.coordinate = coordinate;
    }
    return self;
}

@end

-(MKAnnotationView *)mapView:(MKMapView *)MapView viewForAnnotation:(id<MKAnnotation>)annotation{
    static NSString *cabAnnotationIdentifier=@"cabAnnotationIdentifier";
    MKAnnotationView *annotationView=[MapView dequeueReusableAnnotationViewWithIdentifier:cabAnnotationIdentifier];
    if(!annotationView){            
        annotationView=[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:cabAnnotationIdentifier];
        annotationView.image=[UIImage imageNamed:@"start.png"];             
        annotationView.draggable = YES; 
        annotationView.canShowCallout= YES;
    }
    return annotationView;
}