MKPointAnnotation 到 MKMapItem

Posted 2023-03-05

【中文标题】MKPointAnnotation 到 MKMapItem

【英文标题】：MKPointAnnotation to MKMapItem

【发布时间】：2019-01-12 02:49:32

【问题描述】：

我在尝试打开 Apple 地图获取路线时收到错误消息“无法将 'NSKVONotifying_MKPointAnnotation' 类型的值转换为 'MKMapItem'”。我是这方面的新手，我一直在拼凑代码以使其工作。

struct Location 
    let agencyId: String
    let agencyEventId: String
    let agencyEventSubTypeCode: String
    let latitude: Double
    let longitude: Double
    let agencyEventTypeCode: String


func multiPoint() 

    for receivedEvent in receivedEventsList 
        mapEventLatitude = receivedEvent.latitude!
        mapEventLongitude = receivedEvent.longitude!
        latDouble = ("\(mapEventLatitude))" as NSString).doubleValue
        longDouble = ("\(mapEventLongitude))" as NSString).doubleValue
        multiMapAgencyEventSubTypeCode = receivedEvent.agencyEventSubtypeCode!
        multiMapAgencyId = receivedEvent.agencyId!
        multiMapAgencyEventId = receivedEvent.agencyEventId!
        multiMapAgencyEventTypeCode = receivedEvent.agencyEventTypeCode!

        let locations = [
            Location(agencyId: multiMapAgencyId, agencyEventId: multiMapAgencyEventId, agencyEventSubTypeCode: multiMapAgencyEventSubTypeCode, latitude: latDouble, longitude: longDouble, agencyEventTypeCode: multiMapAgencyEventTypeCode)
            ]


        for location in locations 
            let annotation = MKPointAnnotation()
            annotation.coordinate = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)
            annotation.title = location.agencyId
            annotation.subtitle = multiMapAgencyEventSubTypeCode
            multiEventMap?.addAnnotation(annotation)
            eventTypeNumber = ("\(multiMapAgencyEventTypeCode))" as NSString).intValue
        
    


func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? 
    let reuseIdentifier = "annotationView"
    let view = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: reuseIdentifier)
        view.markerTintColor = UIColor.blue
        view.glyphText = "x"
        view.displayPriority = .required
        view.clusteringIdentifier = nil
        view.canShowCallout = true
        view.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
    return view


func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) 
    let location =  view.annotation as! MKMapItem
    let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
    location.openInMaps(launchOptions: launchOptions)

【参考方案1】：

当您将注释添加到地图时，您将它们添加为MKPointAnnotation，因此转换为MKMapItem 显然会失败。

我建议不要创建MKPointAnnotation，而是创建MKPlacemark 或创建您自己的MKPlacemark 子类，其中包含您感兴趣的其他属性。然后您的calloutAccessoryControlTapped 可以

将view.annotation 转换为您的地标类型； 使用该地标创建MKMapItem；然后 mapItem.openInMaps(launchOptions:)

【讨论】：

感谢您的回复。如前所述，我对开发非常陌生，因此我将尝试弄清楚如何将它们组合在一起。