如何使用標準MKAnnotation符號與自定義MKAnnotationView

Question

我自定義我的callOutView，創建自己的AnnotationViewtheGreatAnnotationView，但我想保留在地圖上的標準註釋針。在此代碼中，我使用了自定義註釋圖像view?.image = annotation.image，但何時刪除該行，我的地圖上沒有註釋。你能幫我解決這個問題嗎？

func mapView(_ surroundingMapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? { 

    var annoView: MKAnnotationView? 
    if annotation.isKind(of: MKUserLocation.self) { 

     return nil 
    } 



    var view = surroundingMapView.dequeueReusableAnnotationView(withIdentifier: "imageAnnotation") 
    if view == nil { 
     view = theGreatAnnotationView(annotation: annotation, reuseIdentifier: "imageAnnotation") 
     reuseIdentifier: "imageAnnotation") 
     view!.canShowCallout = false 

    } 

    let annotation = annotation as! Artwork 


    view?.image = annotation.image 
    view?.annotation = annotation 


    return view 
} 

Answer 1

您應該使用MKPinAnnotationView代替MKAnnotationView。

func mapView(_ surroundingMapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? { 

    var annoView: MKAnnotationView? 
    if annotation.isKind(of: MKUserLocation.self) { 

     return nil 
    } 

    if /* if annotation is image */ { 
     var view = surroundingMapView.dequeueReusableAnnotationView(withIdentifier: "imageAnnotation") 
     if view == nil { 
      view = theGreatAnnotationView(annotation: annotation, reuseIdentifier: "imageAnnotation") 
      view!.canShowCallout = false 

     } 

     let annotation = annotation as! Artwork 


     view?.image = annotation.image 
     view?.annotation = annotation 
    } else { 
     /* if annotation is pin */ 
     var view = surroundingMapView.dequeueReusableAnnotationView(withIdentifier: "pinAnnotation") 
     if view == nil { 
      view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "pinAnnotation") 
      view!.canShowCallout = false 
     } 

     let annotation = annotation as! Artwork 


     view?.annotation = annotation 
    } 

    return view 
}