创建一个快速的帮助程序类来处理CoreLocation函数

Question

我是Swift的新手，我设法创建了一个启动器应用，该应用可以获取当前的GPS位置。现在，我正在尝试创建一个助手类（Location.swift），该类将执行所有基于GPS位置的功能，并可以从我的主ViewController中调用它（例如Location.getGPSLocation（），其中getGPSLocation是Location.swift中的静态函数助手类）。

请查看我的Location.swift帮助程序类代码：

    import Foundation
    import CoreLocation

    public class Location
    {
    private static let locationManager = CLLocationManager()

    public static func getGPSLocation()
    {
        let authorizationStatus = CLLocationManager.authorizationStatus()

        if (authorizationStatus == .notDetermined)
        {
            locationManager.requestWhenInUseAuthorization()
            return
        } else if (authorizationStatus == .denied || authorizationStatus == .restricted)
        {
            print("ERROR: Please enable location services")
            return
        } else
        {
            startLocationManager()
        }

    }

    private static func startLocationManager()
    {
        if CLLocationManager.locationServicesEnabled()
        {
            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.startUpdatingLocation()
        }
    }
}

我现在收到上面代码“无法将类型'Location.Type'的值分配给类型'CLLocationManagerDelegate？”的错误消息。

我该如何解决？

干杯！

Answer 1

首先，您的Location对象需要继承NSObject和CLLocationManagerDelegate。其次，您需要提供shared实例属性，并将管理器声明从静态更改为实例属性。第三，重写Location初始化程序，调用super，然后启用您的位置信息服务并在此处设置您的经理委托：

import CoreLocation
class Location: NSObject, CLLocationManagerDelegate {

    private let manager = CLLocationManager()

    static let shared = Location()

    var location: CLLocation?

    private override init() {
        super.init()
        if CLLocationManager.locationServicesEnabled() {
            manager.delegate = self
            manager.desiredAccuracy = kCLLocationAccuracyBest
            manager.requestWhenInUseAuthorization()
            manager.distanceFilter = 10
        }
    }

    static func requestGPS() {
        Location.shared.manager.requestLocation()
    }
}

现在您可以实现扩展Location的委托方法：

extension Location {
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        self.location = locations.last
        print("location", location ?? "")
    }
    func locationManager(_ manager: CLLocationManager,
                                  didChangeAuthorization status: CLAuthorizationStatus) {
        print(#function, "status", status)
        // check the authorization status changes here
    }
    func locationManager(_ manager: CLLocationManager,
                                  didFailWithError error: Error) {
        print(#function)
        if (error as? CLError)?.code == .denied {
            manager.stopUpdatingLocation()
            manager.stopMonitoringSignificantLocationChanges()
        }
    }
}