Swift：获取当前用户坐标并将其存储到变量中

Question

我目前正在尝试获取用户的当前坐标，并最终将这些值存储到变量中。

我创建了以下 class 来定义用户当前位置并设置提取数据的函数。

import Foundation
import CoreLocation

class MyCurrentCoordinate: NSObject {


     private var currentLocation: CLLocation!

     var myLatitude = 0.0
     var myLongitude = 0.0
     var myAltitude = 0.0

     override init() {
         super.init()
     }

     func getLat() {
         myLatitude = currentLocation.coordinate.latitude
     }

     func getLong() {
         myLongitude = currentLocation.coordinate.longitude
     }

     func getAlt() {
         myAltitude = currentLocation.altitude
     }
}

这没有显示任何错误。但是，当我去调用任何函数（getLat、getLong 或 getAlt）来提取一段用户位置数据时，由于值为 nil，应用程序崩溃了。有没有人知道为什么没有传递实际用户纬度、经度或海拔高度？

我有位置权限，info.plist更新为允许用户授予位置跟踪权限。

Answer 1

你可以使用 CLLocationManager

添加应用能力，您可以打开您的info.plist喜欢的源代码并添加：

<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>App requires allways tracking</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>App requires background tracking</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>App requires tracking when be in use</string>

<key>UIBackgroundModes</key>
<array>
    <string>fetch</string>
    <string>location</string>
    <string>remote-notification</string>
</array>

请求像 locationManager.requestAlwaysAuthorization() 这样的授权并管理是否有正确的访问权限... CLLocationManager.authorizationStatus() == .authorizedAlways

import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {
    var locationManager: CLLocationManager?

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager = CLLocationManager()
        locationManager?.delegate = self
        locationManager?.requestAlwaysAuthorization()
        if CLLocationManager.authorizationStatus() == .authorizedAlways {
            locationManager.allowsBackgroundLocationUpdates = true
            locationManager.pausesLocationUpdatesAutomatically = false
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.startUpdatingLocation()
        }
        if CLLocationManager.authorizationStatus() == .authorizedWhenInUse {
            locationManager.allowsBackgroundLocationUpdates = false
            locationManager.pausesLocationUpdatesAutomatically = true
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.startUpdatingLocation()
        }
    }
}

extension ViewController: CLLocationManagerDelegate {

    public func locationManager(_: CLLocationManager, didUpdateLocations locations: [CLLocation]){
        guard let location = locations.first else { return }
        print(location)

    }

    public func locationManager(_: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        switch status {
        case .notDetermined:
            print("Autorization status did change \(status)")
        case .authorizedWhenInUse:
            print("Autorization status did change \(status)")
        case .authorizedAlways:
            print("Autorization status did change \(status)")
        case .restricted:
            print("Autorization status did change \(status)")
        case .denied:
            print("Autorization status did change \(status)")
        @unknown default:
            fatalError()
        }
    }
}

不要忘记在某个地方停止locationManager.stopUpdatingLocation()

Answer 2

import Foundation
import CoreLocation
import UIKit

public protocol LocalizationHelperDelegate: class {
    func didUpdateLocation(_ sender: CLLocation)
}

public class LocalizationHelper: NSObject {

    public weak var delegate: LocalizationHelperDelegate?
    public static var shared = LocalizationHelper()

    private lazy var locationManager: CLLocationManager = {
        let locationManager = CLLocationManager()
        locationManager.requestAlwaysAuthorization()
        locationManager.allowsBackgroundLocationUpdates = true
        locationManager.pausesLocationUpdatesAutomatically = false
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        return locationManager
    }()

    private var currentLocation: CLLocationCoordinate2D?

    public func startUpdatingLocation() {
        locationManager.delegate = self
        locationManager.startUpdatingLocation()
    }

    public func stopUpdatingLocation() {
        locationManager.stopUpdatingLocation()
    }

    public func getCurrentLocation() -> CLLocationCoordinate2D? {
        return currentLocation
    }

    public func getLat() -> Double{
        return currentLocation?.latitude ?? 0.0
    }

    public func getLon() -> Double{
        return currentLocation?.longitude ?? 0.0
    }


}

extension LocalizationHelper: CLLocationManagerDelegate {

    public func locationManager(_: CLLocationManager, didUpdateLocations locations: [CLLocation]){
        guard let location = locations.first else { return }
        currentLocation = location.coordinate
        print("[Update location at - \(Date())] with - lat: \(currentLocation!.latitude), lng: \(currentLocation!.longitude)")
        delegate?.didUpdateLocation(location)
    }
}

如何使用

LocalizationHelper.shared.Start()
...
let lat = LocalizationHelper.shared.getLat()
let lon = LocalizationHelper.shared.getLon()
...
LocalizationHelper.shared.Stop()

Swift：获取当前用户坐标并将其存储到变量中

Swift: Get Current User Coordinates and Store them into a Variable

swift

swiftui

coordinates

core-location

cllocation