在 SwiftUI 中点击 MKMapView

Question

我在 SwiftUI 应用程序中有一张地图。它正在发挥作用；但现在我希望能够点击它并知道点击的纬度和经度。这是当前代码：

import SwiftUI
import MapKit

struct MapView: UIViewRepresentable {
    @Binding var centerCoordinate: CLLocationCoordinate2D
    
    func makeUIView(context: Context) -> MKMapView {
        let mapView = MKMapView()
        mapView.delegate = context.coordinator
        
        let gRecognizer = UITapGestureRecognizer(target: context.coordinator,
                                action: #selector(Coordinator.tapHandler(_:)))
        mapView.addGestureRecognizer(gRecognizer)
        return mapView
    }

    func updateUIView(_ view: MKMapView, context: Context) {
        //print(#function)
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }

    class Coordinator: NSObject, MKMapViewDelegate {
        var parent: MapView

        init(_ parent: MapView) {
            self.parent = parent
        }

        let gRecognizer = UITapGestureRecognizer(target: self,
                                                 action: #selector(tapHandler(_:)))
        
        @objc func tapHandler(_ gesture: UITapGestureRecognizer) {
            print(#function)
            .... get useful information here ...
        }
    }
}

在这种状态下，我可以看到我点击的时间，但我没有得到我需要的信息（即点击的坐标）。在网上搜索后，我尝试了一些代码变体。此时它还没有工作。任何有关前进道路的相关提示都将非常受欢迎。

Answer 1

我也遇到过类似的情况，我就是这样做的。我制作了 Coordinator UIGestureRecognizerDelegate，并确保为其设置了 gRecognizer 委托，并将其添加到地图中。类似于：

struct MapView: UIViewRepresentable {
@Binding var centerCoordinate: CLLocationCoordinate2D

let mapView = MKMapView()

func makeUIView(context: Context) -> MKMapView {
    mapView.delegate = context.coordinator
    return mapView
}

func updateUIView(_ view: MKMapView, context: Context) {
    //print(#function)
}

func makeCoordinator() -> Coordinator {
    return Coordinator(self)
}

class Coordinator: NSObject, MKMapViewDelegate, UIGestureRecognizerDelegate {
    var parent: MapView

    var gRecognizer = UITapGestureRecognizer()

    init(_ parent: MapView) {
        self.parent = parent
        super.init()
        self.gRecognizer = UITapGestureRecognizer(target: self, action: #selector(tapHandler)) 
        self.gRecognizer.delegate = self
        self.parent.mapView.addGestureRecognizer(gRecognizer)
    }

    @objc func tapHandler(_ gesture: UITapGestureRecognizer) {
        // position on the screen, CGPoint
        let location = gRecognizer.location(in: self.parent.mapView)
        // position on the map, CLLocationCoordinate2D
        let coordinate = self.parent.mapView.convert(location, toCoordinateFrom: self.parent.mapView)
        
    }
}
}

在 SwiftUI 中点击 MKMapView

Tapping an MKMapView in SwiftUI

mkmapview

uitapgesturerecognizer

swift

swiftui

uiviewrepresentable