为什么我的按钮没有从我的应用程序推送到 Apple 地图？

Question

我正在开发一个导航应用程序，它的工作方式类似于普通地图应用程序，允许您通过搜索表等搜索位置。在应用程序中，用户可以通过单击我的可搜索结果中他们想要的结果来创建注释.

问题：当用户点击注释时，它上方应该会出现一个弹出按钮，因为我已经以编程方式创建了它。单击后，它应该将用户推送到 Apple Maps 应用程序，其中预先加载了他们单击的注释的路径。它不再将我推到那里，这很奇怪，因为它曾经可以工作。这是以编程方式创建的按钮：

extension ViewController : MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?{
        if annotation is MKUserLocation {
            //return nil so map view draws "blue dot" for standard user location
            return nil
        }
        let reuseId = "pin"
        var pinView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId) as? MKPinAnnotationView
        pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pinView?.pinTintColor = UIColor.red
        pinView?.canShowCallout = true
        let smallSquare = CGSize(width: 30, height: 30)
        let button = UIButton(frame: CGRect(origin: (CGPoint()), size: smallSquare))
        button.setBackgroundImage(UIImage(named: "car"), for: [])
        button.addTarget(self, action: #selector(getDirections), for: UIControlEvents.touchUpInside)
        
        pinView?.leftCalloutAccessoryView = button
        return pinView
    }
}

这应该执行（在课堂上）

@objc func getDirections(){
    if let selectedPin = selectedPin {
        let mapItem = MKMapItem(placemark: selectedPin)
        let launchOptions = [MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeDriving]
        mapItem.openInMaps(launchOptions: launchOptions)
    }
}

Objective-C 函数会不会有些奇怪？这是我最近添加的可能导致问题的代码，虽然我真的不知道：

func resolveAddress(for averageCoordinate: CLLocationCoordinate2D, completion: @escaping (MKPlacemark?) -> () ) {

    let geocoder = CLGeocoder()
    let averageLocation = CLLocation(latitude: averageCoordinate.latitude, longitude: averageCoordinate.longitude)
    geocoder.reverseGeocodeLocation(averageLocation) { (placemarks, error) in
        guard error == nil,
            let placemark = placemarks?.first
        else {
            completion(nil)
            return
        }
        completion(MKPlacemark(placemark: placemark ))
    }
}

@IBAction func middleFinderButton(_ sender: Any) {
    
    let totalLatitude = mapView.annotations.reduce(0) { $0 + $1.coordinate.latitude }
    
    let totalLongitude = mapView.annotations.reduce(0) { $0 + $1.coordinate.longitude }
    
    let averageLatitude = totalLatitude/Double(mapView.annotations.count)
    
    let averageLongitude = totalLongitude/Double(mapView.annotations.count)
    
    let centerPoint = MKPointAnnotation()
    
    centerPoint.coordinate.latitude = averageLatitude
    centerPoint.coordinate.longitude = averageLongitude
    
    
    mapView.addAnnotation(centerPoint)
    
    resolveAddress(for: centerPoint.coordinate) { placemark in
        if let placemark = placemark {
            self.mapView.addAnnotation(placemark)
        } else {
            self.mapView.addAnnotation(centerPoint)
        }
    }

    print(totalLatitude)
    print(totalLongitude)
    print(averageLatitude)
    print(averageLongitude)
    print(centerPoint.coordinate)
}

github链接：github.com/derekvandermark/VHNavigationAppOfficial-v-0.93

有人知道为什么此按钮不起作用并将应用程序推送到具有预设路线的地图吗？会不会是模拟器出问题了？ （它曾经有效，所以我怀疑它......）

Answer 1

要将用户推送到地图应用，您可以尝试以下操作：

func openMap(lat: String, lng: String){

    let lat1 : NSString = lat as NSString
    let lng1 : NSString = lng as NSString

    let latitude:CLLocationDegrees =  lat1.doubleValue
    let longitude:CLLocationDegrees =  lng1.doubleValue

    let regionDistance:CLLocationDistance = 10000
    let coordinates = CLLocationCoordinate2DMake(latitude, longitude)
    let regionSpan = MKCoordinateRegion(center: coordinates, latitudinalMeters: regionDistance, longitudinalMeters: regionDistance)
    let options = [
        MKLaunchOptionsMapCenterKey: NSValue(mkCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(mkCoordinateSpan: regionSpan.span)
    ]
    let placemark = MKPlacemark(coordinate: coordinates, addressDictionary: nil)
    let mapItem = MKMapItem(placemark: placemark)
    mapItem.openInMaps(launchOptions: options)
}