#5 利用CLLocationManager取得位置

4 min readDec 31, 2022

使用swiftUI加入要求定位的功能

這邊使用CLLocationManager來完成，步驟如下：

新增class，import CoreLoacation框架

import CoreLocation

class LocationVieModel: NSObject, ObservableObject, CLLocationManagerDelegate {
    @Published var authorizationStatus: CLAuthorizationStatus //權限狀態
    private let locationManager: CLLocationManager
    
    override init() {
        locationManager = CLLocationManager()
        authorizationStatus = locationManager.authorizationStatus
        
        super.init()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()
    }
}

2. 在欲做取得定位的View加入以下code

    @StateObject var locationViewModel = LocationVieModel()

    var body: some View{
        VStack{
              locationViewModel.requestPermission()
        }
    }

3. 回到LocationViewModel，加入以下function

    func requestPermission() {
        locationManager.requestWhenInUseAuthorization()
    }
    
    func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
        authorizationStatus = manager.authorizationStatus
    }

4.即可使用模擬器看到位置請求🥹

⚠️模擬器可以自行設定座標，操作如下：

打開模擬器->點選Features->選擇Location->點選Custom Location

5. 如果想讀取位置的座標，在LocationViewModel中加入以下

@Published var lastSeenLocation: CLLocation?
@Published var currentPlaceark: CLPlacemark?
// ...
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
            lastSeenLocation = locations.first
    }
    
    func fetchCountryAndCity(for location: CLLocation?) {
        guard let location = location else { return }
        let geocoder = CLGeocoder()
        geocoder.reverseGeocodeLocation(location) { (placemarks, error) in
            self.currentPlaceark = placemarks?.first
        }
    }

6. 在要讀取的View中加入

var coordinate: CLLocationCoordinate2D? {
        locationViewModel.lastSeenLocation?.coordinate
    }
var body: some View{
        VStack{
            Text(String(coordinate?.longitude ?? 0))
            Text(String(coordinate?.latitude ?? 0))
        }
    }

參考網站

https://www.andyibanez.com/posts/using-corelocation-with-swiftui/

#5 利用CLLocationManager取得位置

Written by Yitingwu