创建一个 swift 助手 class 来处理 CoreLocation 函数

Question

我是 Swift 的新手，我已经成功创建了一个入门应用程序来获取当前的 GPS 位置。现在我正在尝试创建一个助手 class (Location.swift)，它将执行所有基于 GPS 位置的功能，并且可以从我的主程序 ViewController 中调用（例如 Location.getGPSLocation( ) 其中 getGPSLocation 是我的 Location.swift 助手 class) 中的静态函数。

请查看我的 Location.swift 助手代码 class:

    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()
        }
    }
}

我现在收到上述代码的错误消息 "Cannot assign value of type 'Location.Type' to type 'CLLocationManagerDelegate?"。

我该如何解决这个问题？

干杯！

Answer 1

首先你的Location对象需要继承NSObject和CLLocationManagerDelegate。其次，您需要提供一个 shared 实例属性并将您的管理器声明从静态更改为一个实例属性。第三次覆盖您的 Location 初始化程序，调用 super 然后启用您的位置服务并在那里设置您的经理委托：

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()
        }
    }
}

创建一个 swift 助手 class 来处理 CoreLocation 函数

Creating a swift helper class to handle CoreLocation functions

cllocationmanager

swift