SwiftUI-如何知道用户位置是否在MKPolygon中

Question

如何检测用户位置是否在MKPolygon中？我试着搜索类似的东西：

检查当前位置是否在MkPolygons 中

但答案是旧的，所以不适合当前的代码。这是协调员文件

import MapKit
final class Coordinator: NSObject, MKMapViewDelegate {
var parent: MapView
init(_ parent: MapView) {
self.parent = parent
}
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
if overlay is ModelMapOverlay {
return ModelMapOverlayView(overlay: overlay, overlayImage: UIImage(imageLiteralResourceName: "overlay_model"))
} else if overlay is MKPolyline {
let lineView = MKPolylineRenderer(overlay: overlay)
lineView.strokeColor = .green
return lineView
} else if overlay is MKPolygon {
let polygonView = MKPolygonRenderer(overlay: overlay)

if theme == "Ciano" {
polygonView.strokeColor = .init(red: 0/255, green: 255/255, blue: 255/255, alpha: 0.66)
polygonView.fillColor = .init(red: 0/255, green: 255/255, blue: 255/255, alpha: 0.1)
} else if theme == "Rosso" {
polygonView.strokeColor = .init(red: 255/255, green: 0/255, blue: 0/255, alpha: 0.66)
polygonView.fillColor = .init(red: 255/255, green: 0/255, blue: 0/255, alpha: 0.1)
} else if theme == "Verde" {
polygonView.strokeColor = .init(red: 0/255, green: 255/255, blue: 0/255, alpha: 0.66)
polygonView.fillColor = .init(red: 0/255, green: 255/255, blue: 0/255, alpha: 0.1)
} else if theme == "Magenta" {
polygonView.strokeColor = .init(red: 255/255, green: 0/255, blue: 255/255, alpha: 0.66)
polygonView.fillColor = .init(red: 255/255, green: 0/255, blue: 255/255, alpha: 0.1)
} else if theme == "Giallo" {
polygonView.strokeColor = .init(red: 255/255, green: 255/255, blue: 0/255, alpha: 0.66)
polygonView.fillColor = .init(red: 255/255, green: 255/255, blue: 0/255, alpha: 0.1)
} else if theme == "Arancione" {
polygonView.strokeColor = .init(red: 255/255, green: 153/255, blue: 51/255, alpha: 0.66)
polygonView.fillColor = .init(red: 255/255, green: 153/255, blue: 51/255, alpha: 0.1)
} else if theme == "Verde Turchese" {
polygonView.strokeColor = .init(red: 50/255, green: 198/255, blue: 166/255, alpha: 0.66)
polygonView.fillColor = .init(red: 50/255, green: 198/255, blue: 166/255, alpha: 0.1)
} else if theme == "Blu" {
polygonView.strokeColor = .init(red: 0/255, green: 66/255, blue: 255/255, alpha: 0.66)
polygonView.fillColor = .init(red: 0/255, green: 66/255, blue: 255/255, alpha: 0.1)
}/* else {
polygonView.strokeColor = .init(red: 0/255, green: 0/255, blue: 0/255, alpha: 1.0)
polygonView.fillColor = .init(red: 0/255, green: 0/255, blue: 0/255, alpha: 1.0)
}*/
polygonView.alpha = 1.0
polygonView.lineWidth = 5.0

return polygonView
} else if let character = overlay as? Character {
let circleView = MKCircleRenderer(overlay: character)
circleView.strokeColor = character.color
return circleView
}
return MKOverlayRenderer()
}
extension MKPolygon {
func isCoordinateInsidePolyon(coordinate: CLLocationCoordinate2D) -> Bool {
let polygonRenderer = MKPolygonRenderer(polygon: self)
let currentMapPoint: MKMapPoint = MKMapPoint(coordinate)
let polygonViewPoint: CGPoint = polygonRenderer.point(for: currentMapPoint)
if polygonRenderer.path == nil {
return false
} else {
return polygonRenderer.path.contains(polygonViewPoint)
}
}
}

---

地图视图文件：

import SwiftUI
import MapKit
let model = Model(filename: "ZONE_LIST")
var mapView = MKMapView() // (frame: UIScreen.main.bounds)
var theme = ""
struct MapView: UIViewRepresentable {

//var coordinates: CLLocationCoordinate2D

func makeUIView(context: Context) -> MKMapView {
let latDelta = model.overlayTopLeftCoordinate.latitude - model.overlayBottomRightCoordinate.latitude
let rootSpan = MKCoordinateSpan(latitudeDelta: fabs(latDelta), longitudeDelta: 0.99)
let rootRegion = MKCoordinateRegion(center: model.midCoordinate, span: rootSpan)

mapView.showsUserLocation = true

mapView.region = rootRegion
mapView.delegate = context.coordinator

mapView.userLocation.title = "WILLIAMONE" // 39,9873 | 18,2420

return mapView
}

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

func updateUIView(_ uiView: MKMapView, context: UIViewRepresentableContext<MapView>) {
/*let span = MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01)
let region = MKCoordinateRegion(center: coordinates, span: span)
mapView.setRegion(region, animated: true)*/
}
}

---

LocationManager文件：

import MapKit
class LocationManager: NSObject, CLLocationManagerDelegate {

private let locationManager = CLLocationManager()
var location: CLLocation? = nil

override init() {
super.init()
if CLLocationManager.locationServicesEnabled() {
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.distanceFilter = kCLDistanceFilterNone
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
}
}
}

---

在内容视图中：

import SwiftUI
import MapKit
struct ContentView: View {

private var locationManager = LocationManager()
@State var isInArea: Bool = false

然后在正文中，我使用了这个函数来调用区域和你与我共享的代码片段，我亲爱的好朋友：(

mapView.addOverlay(MKPolygon(coordinates: model.zona40, count: model.zona40.count)) // LECCE TANGENZIALE EST
self.isInArea = MKPolygon(coordinates: model.zona40, count: model.zona40.count).isCoordinateInsidePolyon(coordinate: locationManager)

错误是该参数需要CLLocationCoordinate2D，而不是我的LocationManager，它是用户位置

我希望现在的编辑是更详细的

Answer 1

我没有看到任何实际处理位置更新的代码？

假设您已经在LocationManager中按照以下方式实现了这一点：

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let loc = locations.first {
self.location = loc
}
}

您的问题行将从以下更改为：

self.isInArea = MKPolygon(coordinates: model.zona40, count: model.zona40.count).isCoordinateInsidePolyon(coordinate: locationManager)

至：

guard let c2D = self.locationManager.location?.coordinate else {
return
}
self.isInArea = MKPolygon(coordinates: model.zona40, count: model.zona40.count).isCoordinateInsidePolyon(coordinate: c2D)

如果尚未已经实现didUpdateLocations委托函数，请阅读一两篇核心位置教程。