Ios 未调用CLLocationManager didUpdateLocations

我正在学习使用Swift开发iOS 8应用程序。我已经跟随了一个关于如何在Swift和iOS 8中构建天气应用程序的教程

作为对应用程序的改进，作者/导师建议使用

CLLocationManager

获取设备的位置，以输入天气API，而不是硬编码的纬度和经度值

所以，在网上阅读了各种教程之后，我已经开始尝试实施这一改进建议

我已将负责获取位置坐标的代码放在

AppDelegate.swift

文件中

AppDelegate.swift代码

import UIKit
import CoreLocation

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate {

    var window: UIWindow?
    var locationManager: CLLocationManager!
    var errorOccured: Bool = false
    var foundLocation: Bool = false
    var locationStatus: NSString = "Not Started"
    var location: CLLocationCoordinate2D?
    var locationName: String?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        application.setStatusBarHidden(true, withAnimation: .None)
        initializeLocationManager()
        return true
    }

    func initializeLocationManager() {
        self.locationManager = CLLocationManager()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
        self.locationManager.requestAlwaysAuthorization()
        self.locationManager.startUpdatingLocation()
    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        println("didUpdateLocations running")
        if (foundLocation == false) {
            self.locationManager.stopUpdatingLocation()
            foundLocation = true
            var locationArray = locations as NSArray
            var locationObj = locationArray.lastObject as CLLocation
            var geoCoder = CLGeocoder()
            geoCoder.reverseGeocodeLocation(locationObj, completionHandler: { (placemarks, error) -> Void in
                var p = placemarks as NSArray
                var placemark: CLPlacemark? = p.lastObject as? CLPlacemark
                self.locationName = placemark?.name
            })
            self.location = locationObj.coordinate
        }
    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        locationManager.stopUpdatingLocation()
        if ((error) != nil) {
            if (errorOccured == false) {
                errorOccured = true
                print(error)
            }
        }
    }

    // authorization status
    func locationManager(manager: CLLocationManager!,
        didChangeAuthorizationStatus status: CLAuthorizationStatus) {
            var shouldIAllow = false

            switch status {
            case CLAuthorizationStatus.Restricted:
                locationStatus = "Restricted Access to location"
            case CLAuthorizationStatus.Denied:
                locationStatus = "User denied access to location"
            case CLAuthorizationStatus.NotDetermined:
                locationStatus = "Status not determined"
            default:
                locationStatus = "Allowed to location Access"
                shouldIAllow = true
            }
            NSNotificationCenter.defaultCenter().postNotificationName("LabelHasbeenUpdated", object: nil)
            if (shouldIAllow == true) {
                NSLog("Location to Allowed")
                // Start location services
                locationManager.startUpdatingLocation()
            } else {
                NSLog("Denied access: \(locationStatus)")
            }
    }

}

func getCurrentWeatherData() -> Void {
    let baseURL = NSURL(string: "https://api.forecast.io/forecast/\(apiKey)/")
    var forecastURL: NSURL
    var locName = "London"

    let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
    appDelegate.foundLocation = false

    if let loc = appDelegate.location {
        println("Got Location!") // for debug purposes
        var currentLat = loc.latitude
        var currentLng = loc.longitude
        forecastURL = NSURL(string: "\(currentLat),\(currentLng)", relativeToURL: baseURL)
        locName = appDelegate.locationName!
    } else {
        println("No Location :(") // for debug purposes
        var currentLat = "51.513445"
        var currentLng = "-0.157828"
        forecastURL = NSURL(string: "\(currentLat),\(currentLng)", relativeToURL: baseURL)
    }

    let sharedSession = NSURLSession.sharedSession()

    let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
        var urlContents = NSString.stringWithContentsOfURL(location, encoding: NSUTF8StringEncoding, error: nil)
        if (error == nil) {
            let dataObject = NSData(contentsOfURL: location)
            let weatherDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject, options: nil, error: nil) as NSDictionary
            let currentWeather = Current(weatherDictionary: weatherDictionary)
            dispatch_async(dispatch_get_main_queue(), {
                () -> Void in
                self.locationNameLabel.text = "\(locName)"
                self.temperatureLabel.text = "\(currentWeather.temperature)"
                self.iconView.image = currentWeather.icon!
                self.currentTimeLabel.text = "At \(currentWeather.currentTime!) it is"
                self.humidityLabel.text = "\(currentWeather.humidity)"
                self.percipitationLabel.text = "\(currentWeather.percipProbability)"
                self.summaryLabel.text = "\(currentWeather.summary)"
                // Stop refresh animation
                self.refreshActivityIndicator.stopAnimating()
                self.refreshActivityIndicator.hidden = true
                self.refreshButton.hidden = false
            })
        } else {
            let networkIssueController = UIAlertController(title: "Error", message: "Unable to load data. Connectivity error!", preferredStyle: .Alert)
            let okButton = UIAlertAction(title: "OK", style: .Default, handler: nil)
            networkIssueController.addAction(okButton)
            let cancelButton = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
            networkIssueController.addAction(cancelButton)
            self.presentViewController(networkIssueController, animated: true, completion: nil)

            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                self.refreshActivityIndicator.stopAnimating()
                self.refreshActivityIndicator.hidden = true
                self.refreshButton.hidden = false
            })
        }
    })

    downloadTask.resume()
}

然后在我的

ViewController.swift

文件中，我想获得位置坐标。代码如下：

ViewController.swift代码

import UIKit
import CoreLocation

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate {

    var window: UIWindow?
    var locationManager: CLLocationManager!
    var errorOccured: Bool = false
    var foundLocation: Bool = false
    var locationStatus: NSString = "Not Started"
    var location: CLLocationCoordinate2D?
    var locationName: String?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        application.setStatusBarHidden(true, withAnimation: .None)
        initializeLocationManager()
        return true
    }

    func initializeLocationManager() {
        self.locationManager = CLLocationManager()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
        self.locationManager.requestAlwaysAuthorization()
        self.locationManager.startUpdatingLocation()
    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        println("didUpdateLocations running")
        if (foundLocation == false) {
            self.locationManager.stopUpdatingLocation()
            foundLocation = true
            var locationArray = locations as NSArray
            var locationObj = locationArray.lastObject as CLLocation
            var geoCoder = CLGeocoder()
            geoCoder.reverseGeocodeLocation(locationObj, completionHandler: { (placemarks, error) -> Void in
                var p = placemarks as NSArray
                var placemark: CLPlacemark? = p.lastObject as? CLPlacemark
                self.locationName = placemark?.name
            })
            self.location = locationObj.coordinate
        }
    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        locationManager.stopUpdatingLocation()
        if ((error) != nil) {
            if (errorOccured == false) {
                errorOccured = true
                print(error)
            }
        }
    }

    // authorization status
    func locationManager(manager: CLLocationManager!,
        didChangeAuthorizationStatus status: CLAuthorizationStatus) {
            var shouldIAllow = false

            switch status {
            case CLAuthorizationStatus.Restricted:
                locationStatus = "Restricted Access to location"
            case CLAuthorizationStatus.Denied:
                locationStatus = "User denied access to location"
            case CLAuthorizationStatus.NotDetermined:
                locationStatus = "Status not determined"
            default:
                locationStatus = "Allowed to location Access"
                shouldIAllow = true
            }
            NSNotificationCenter.defaultCenter().postNotificationName("LabelHasbeenUpdated", object: nil)
            if (shouldIAllow == true) {
                NSLog("Location to Allowed")
                // Start location services
                locationManager.startUpdatingLocation()
            } else {
                NSLog("Denied access: \(locationStatus)")
            }
    }

}

func getCurrentWeatherData() -> Void {
    let baseURL = NSURL(string: "https://api.forecast.io/forecast/\(apiKey)/")
    var forecastURL: NSURL
    var locName = "London"

    let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
    appDelegate.foundLocation = false

    if let loc = appDelegate.location {
        println("Got Location!") // for debug purposes
        var currentLat = loc.latitude
        var currentLng = loc.longitude
        forecastURL = NSURL(string: "\(currentLat),\(currentLng)", relativeToURL: baseURL)
        locName = appDelegate.locationName!
    } else {
        println("No Location :(") // for debug purposes
        var currentLat = "51.513445"
        var currentLng = "-0.157828"
        forecastURL = NSURL(string: "\(currentLat),\(currentLng)", relativeToURL: baseURL)
    }

    let sharedSession = NSURLSession.sharedSession()

    let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in
        var urlContents = NSString.stringWithContentsOfURL(location, encoding: NSUTF8StringEncoding, error: nil)
        if (error == nil) {
            let dataObject = NSData(contentsOfURL: location)
            let weatherDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject, options: nil, error: nil) as NSDictionary
            let currentWeather = Current(weatherDictionary: weatherDictionary)
            dispatch_async(dispatch_get_main_queue(), {
                () -> Void in
                self.locationNameLabel.text = "\(locName)"
                self.temperatureLabel.text = "\(currentWeather.temperature)"
                self.iconView.image = currentWeather.icon!
                self.currentTimeLabel.text = "At \(currentWeather.currentTime!) it is"
                self.humidityLabel.text = "\(currentWeather.humidity)"
                self.percipitationLabel.text = "\(currentWeather.percipProbability)"
                self.summaryLabel.text = "\(currentWeather.summary)"
                // Stop refresh animation
                self.refreshActivityIndicator.stopAnimating()
                self.refreshActivityIndicator.hidden = true
                self.refreshButton.hidden = false
            })
        } else {
            let networkIssueController = UIAlertController(title: "Error", message: "Unable to load data. Connectivity error!", preferredStyle: .Alert)
            let okButton = UIAlertAction(title: "OK", style: .Default, handler: nil)
            networkIssueController.addAction(okButton)
            let cancelButton = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
            networkIssueController.addAction(cancelButton)
            self.presentViewController(networkIssueController, animated: true, completion: nil)

            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                self.refreshActivityIndicator.stopAnimating()
                self.refreshActivityIndicator.hidden = true
                self.refreshButton.hidden = false
            })
        }
    })

    downloadTask.resume()
}

上面的不工作。我的

didUpdateLocations

委托从未被调用。在调试控制台/输出中，我总是得到

无位置：（

打印出来，这表明获取位置失败，更具体地说，这表明我的

AppDelegate

上的Location属性是

nil

我为纠正这一点所做的事情：

在info.plist中，我添加了两个键

nslocationwhenUsageDescription

和

NSLocationAlwaysUsageDescription

确保我通过WiFi而不是以太网连接

---

还有数不清的其他代码调整，但仍然一无所获。

一些观察结果：

正如您所指出的，如果要调用

requestAlwaysAuthorization

，则必须设置

NSLocationAlwaysUsageDescription

。如果调用

requestwhenuseauthorization

，则需要

nslocationwhenuseagedescription

。（您看到确认对话框的事实意味着您已经正确地执行了此操作。我假设您看到的是您在确认警报中提供的任何描述。）

在模拟器上，您可能看不到设备上的位置更新。请在实际设备上进行测试

当我使用你的代码时，我看到了

didUpdateLocations

，当我从设备调用它时，但不是从模拟器调用它

一旦解决了无法看到调用的

didUpdateLocations

的问题，就会出现另一个问题：

您在授权状态更改时发布通知，但在异步接收位置时（即稍后）不会发布通知。坦率地说，从视图控制器的角度来看，后者是更关键的事件，因此我认为（a）您应该在接收位置时发布通知；以及（b）视图控制器应注意此通知。现在，即使您成功地获得要调用的

didUpdateLocations

，视图控制器也不会收到此类通知

此外，您的

didUpdateLocations

正在启动另一个异步过程，即坐标的地理编码。如果您的视图控制器也需要该过程，您应该在地理编码器的完成块内发布通知

坦率地说，您甚至没有向我们展示视图控制器代码，该代码为该

CLLocationManagerDelegate

代码将调用的任何通知添加了一个观察者，但我假设您已经这样做了

---

仅供记录：我首先放置了两个键（

NSLocationAlwaysUsageDescription

和

nslocationwhenusagedescription

）进入

测试plist

而不是

应用程序plist

。我花了一些时间才意识到….

对不起，我不知道Swift。但是LocationManager的一个常见错误是忘记保留它。您的var保留了吗？嗯，以前没有听说过，保留是什么意思？它只是文件顶部的一个

var

如你所见。它是否要求获得读取位置的权限？是的，在iOS模拟器中，它确实要求使用权限。很抱歉问一些琐碎的问题，但是：你在真实的设备上尝试过吗？你在模拟器中设置过位置吗？你尝试过重置模拟器吗？谢谢Rob，我认为第2点可能是这样的。我的想法正确吗我不需要成为一名苹果开发者（付费）才能在我的iPhone上进行测试吗？谢谢，我回家后会确保我没有这样做。