SwiftMapKit無法使用Pin顯示位置

我是 swift 的新手。我正在嘗試使用 Pin 顯示用戶位置。我在Info Plist中添加了允許用戶訪問的權限。我正在使用情節提要，并且我嘗試編輯模式也添加了默認位置，但它沒有解決問題。我正在將 CLLocationManagerDelegate 與 MapKit 一起使用。

這是我的視圖控制器代碼..

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    @IBOutlet var mapView: MKMapView!

    let manager  = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()

    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.delegate = self
        manager.requestWhenInUseAuthorization()
        manager.stopUpdatingLocation()
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.first {
            manager.stopUpdatingLocation()

            render(location)
        }
    }
    func  render(_ location: CLLocation) {

        let coordinate = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)

        let span  = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)

        let region  = MKCoordinateRegion(center: coordinate, span: span)

        mapView.setRegion(region, animated: true)

        let pin = MKPointAnnotation()
        pin.coordinate = coordinate
        mapView.addAnnotation(pin)

    }

}

這是Info Plist的截圖

這是我運行應用程式時的螢屏截圖。

這是代碼警告..

uj5u.com熱心網友回復：

嘗試這種方式：使您的 ViewController 類符合 CLLocationManagerDelegate 和 MKMapViewDelegate，宣告您的物件：

let mapView = MKMapView()
let manager = CLLocationManager()

在 viewDidLoad 中呈現 mapView 并添加約束：

override func viewDidLoad() {
    super.viewDidLoad()
    
    mapView.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(mapView)
    mapView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    mapView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    mapView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    mapView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

}

在 viewDidAppear 呼叫 requestAlwaysAuthorization 和 requestWhenInUseAuthorization 以及地圖配置

manager.requestAlwaysAuthorization()
manager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.startUpdatingLocation()
    }
    mapView.delegate = self
    mapView.mapType = .standard
    mapView.isZoomEnabled = true
    mapView.isScrollEnabled = true
    mapView.showsUserLocation = false // if you want to show default pin set to true

    if let coor = mapView.userLocation.location?.coordinate{
        mapView.setCenter(coor, animated: true)
    }

之后設定 didUpdateLocations

func locationManager(_ manager: CLLocationManager, didUpdateLocations
    locations: [CLLocation]) {
    
    guard let mylocation = manager.location else { return }
    
    let myCoordinates: CLLocationCoordinate2D = mylocation.coordinate

    mapView.mapType = MKMapType.standard

    let span = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
    let region = MKCoordinateRegion(center: myCoordinates, span: span)
    mapView.setRegion(region, animated: true)
    // comment pin object if showsUserLocation = true
    let pin = MKPointAnnotation()
    pin.coordinate = myCoordinates
    pin.title = "You are here"
    mapView.addAnnotation(pin)
}

我的 info.plist 隱私授權

結果，我在我的模擬器選項方案中設定了東京

在下面的評論中將代碼與您的 DispatchQueue 請求進行互動：

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {

let mapView = MKMapView()
let manager = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()
    
    mapView.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(mapView)
    mapView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
    mapView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
    mapView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    mapView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true

}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    
    manager.requestAlwaysAuthorization()
    manager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {
        DispatchQueue.main.async {
            self.manager.delegate = self
            self.manager.desiredAccuracy = kCLLocationAccuracyBest
            self.manager.startUpdatingLocation()
            self.mapView.delegate = self
            self.mapView.mapType = .standard
            self.mapView.isZoomEnabled = true
            self.mapView.isScrollEnabled = true
            self.mapView.showsUserLocation = false // if you want to show default pin
        }
    }

    if let coor = mapView.userLocation.location?.coordinate {
        mapView.setCenter(coor, animated: true)
    }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations
    locations: [CLLocation]) {
    
    guard let mylocation = manager.location else { return }
    
    let myCoordinates: CLLocationCoordinate2D = mylocation.coordinate

    mapView.mapType = MKMapType.standard

    let span = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
    let region = MKCoordinateRegion(center: myCoordinates, span: span)
    mapView.setRegion(region, animated: true)
    
    let pin = MKPointAnnotation()
    pin.coordinate = myCoordinates
    pin.title = "You are here"
    mapView.addAnnotation(pin)
 }
}

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