在iOS 14小部件中获取当前位置 [英] Fetching current location in iOS 14 Widget

问题描述

是否有人试图在iOS 14小部件中更新用户的位置?在阅读了Apple Developer论坛之后，我想出了围绕 CLLocationManager 的书写包装，并以此方式使用它:

Has anyone tried to update user's location in iOS 14 Widget? After reading Apple Developer forums I've come up with the writing wrapper around CLLocationManager and using it this way:

class WidgetLocationManager: NSObject, CLLocationManagerDelegate {
    var locationManager: CLLocationManager? {
        didSet {
            self.locationManager!.delegate = self
        }
    }
    private var handler: ((CLLocation) -> Void)?
    
    func fetchLocation(handler: @escaping (CLLocation) -> Void) {
        self.handler = handler
        self.locationManager!.requestLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        self.handler!(locations.last!)
    }
    
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print(error)
    }
}

并以这种方式使用它:

var widgetLocationManager = WidgetLocationManager()
    func getTimeline(for configuration: SelectPlaceIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
        if widgetLocationManager.locationManager == nil {
            widgetLocationManager.locationManager = CLLocationManager()
            widgetLocationManager.locationManager!.requestWhenInUseAuthorization()
        }
        widgetLocationManager.fetchLocation(handler: { location in
            print(location)
            .......
        })
    }

在Widget的 info.plist 中我也有这两个条目:

I also have these 2 entries in Widget's info.plist:

<key>NSLocationUsageDescription</key>
<string>1</string>

<key>NSWidgetWantsLocation</key>
<true/>

当调用locationManager.requestLocation()时，授权状态为authorisedWhenInUse，但从未调用委托的方法.我想念什么?

When locationManager.requestLocation() is being called, authorisation status is authorisedWhenInUse, but delegate's method is never being called. What am I missing?

推荐答案

首先，我看到的明显问题是

First of all, the obvious problem that I see:

<key>NSLocationUsageDescription</key>
<string>1</string>

NSLocationUsageDescription 已弃用: Apple文档，因此您应该改用 NSLocationWhenInUseUsageDescription 或 NSLocationAlwaysAndWhenInUseUsageDescription .确保在主应用程序 Info.plist 中也包含您选择的权限

NSLocationUsageDescription is deprecated: Apple Documentation , so you should be using NSLocationWhenInUseUsageDescription or NSLocationAlwaysAndWhenInUseUsageDescription instead. Be sure to include the permission that you choose in main apps Info.plist as well

此外，在

func getTimeline(for configuration: SelectPlaceIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
    ...
}

可能会出现问题，因为它可以从后台线程中调用，所以我将像这样重构您的 WidgetLocationManager :

might be problematic, since it can get called from background thread, so I would refactor your WidgetLocationManager like this:

class WidgetLocationManager: NSObject, CLLocationManagerDelegate {
    var locationManager: CLLocationManager? 
    private var handler: ((CLLocation) -> Void)?

    override init() {
        super.init()
        DispatchQueue.main.async {
            self.locationManager = CLLocationManager()
            self.locationManager!.delegate = self
            if self.locationManager!.authorizationStatus == .notDetermined {
                self.locationManager!.requestWhenInUseAuthorization()
            }
        }
    }
    
    func fetchLocation(handler: @escaping (CLLocation) -> Void) {
        self.handler = handler
        self.locationManager!.requestLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        self.handler!(locations.last!)
    }
    
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print(error)
    }
}

，然后像这样使用它:

var widgetLocationManager = WidgetLocationManager()

func getTimeline(for configuration: SelectPlaceIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> Void) {
    widgetLocationManager.fetchLocation(handler: { location in
        print(location)
        .......
    })
}

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