ios - SWIFT:核心位置返回 nil - 如何调用 didUpdateLocations？

Question

我对核心位置有疑问，我已按照以下设置进行操作 https://stackoverflow.com/a/24696878/6140339这个答案，并将我的所有代码放在 AppDelegate 中，但我不知道如何调用它，所以我创建了另一个与 didUpdateLocations 执行相同操作的函数，并在我的 findMyLocation 按钮内调用它，它只返回 nil 。

我尝试在模拟器中设置自定义位置，仍然为零，我尝试使用调试器并设置位置，我什至尝试在我的 iPhone 上测试它，看看是否可以获得位置，但仍然一无所获。

有没有办法从我的按钮调用 didUpdateLocations ？或者我只是做错了一些我错过的事情。

这是我在 viewController 中的代码:

import UIKit
import Social
import CoreLocation

class FirstViewController: UIViewController{

//let social = socialFunctions()
let locationManager = CLLocationManager()
let location = locationFunctions()
var locationFixAchieved = false
var currentLocation = CLLocation()

@IBOutlet weak var locationLabel: UILabel!

@IBAction func findMyLocation(sender: AnyObject) {
    updateLocation()
    print("Location: \(locationManager.location)")
}

@IBAction func postToFacebookButton(sender: UIButton) {
    postToFacebook()
}

@IBAction func postTweetButton(sender: UIButton) {
    postToTwitter()
}

override func preferredStatusBarStyle() -> UIStatusBarStyle {
    return .LightContent
}
override func viewDidLoad() {
    super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

//MARK: - SOCIAL FUNCTIONS
func postToFacebook(){
    if(SLComposeViewController.isAvailableForServiceType(SLServiceTypeFacebook)){
        let socialController = SLComposeViewController(forServiceType: SLServiceTypeFacebook)
        //creates post with pre-desired text
        socialController.setInitialText("")
        presentViewController(socialController, animated: true, completion: nil)
    }
}

func postToTwitter(){
    if(SLComposeViewController.isAvailableForServiceType(SLServiceTypeTwitter)){
        let socialController = SLComposeViewController(forServiceType: SLServiceTypeTwitter)
        //creates post with pre-desired text
        socialController.setInitialText("")
        presentViewController(socialController, animated: true, completion: nil)
    }
}

//MARK: - LOCATION FUNCTIONS
func updateLocation() {
    let locations = [CLLocation]()
    if (locationFixAchieved == false) {
        locationFixAchieved = true
        let locationArray = locations as NSArray
        let locationObj = locationArray.lastObject as? CLLocation
        let coord = locationObj?.coordinate
        if coord?.latitude != nil {
            locationLabel.text = ("Location \r\n Latitude: \(coord?.latitude) \r\n Longitude: \(coord?.longitude)")
            print("Latitude: \(coord?.latitude)")
            print("Longitude: \(coord?.longitude)")
        } else {
            locationLabel.text = ("Could not find location")
            print("LAT & LONG are nil")
        }
    }
}

}

这是我添加到我的 appDelegate 的代码

import UIKit
import CoreLocation
let fvc = FirstViewController()

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate {

var window: UIWindow?
var locationManager: CLLocationManager!
var seenError : Bool = false
var locationFixAchieved: Bool = false
var locationStatus : NSString = "Not Started"

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {
    initLocationManager();
    return true
}

func initLocationManager() {
    seenError = false
    locationFixAchieved = false
    locationManager = CLLocationManager()
    locationManager.delegate = self
    CLLocationManager.locationServicesEnabled()
    locationManager.desiredAccuracy = kCLLocationAccuracyBest

    locationManager.requestAlwaysAuthorization()
}

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

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let locations = [CLLocation]()
        if (locationFixAchieved == false) {
            locationFixAchieved = true
            let locationArray = locations as NSArray
            let locationObj = locationArray.lastObject as? CLLocation
            let coord = locationObj?.coordinate

            print("Latitude: \(coord?.latitude)")
            print("Longitude: \(coord?.longitude)")
            //fvc.locationLabel.text = ("Location \r\n Latitude: \(coord?.latitude) \r\n Longitude: \(coord?.longitude)")
    }
}

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 location Access"
        shouldIAllow = true
    }
    NSNotificationCenter.defaultCenter().postNotificationName("LabelHasBeenUpdated", object: nil)
    if (shouldIAllow == true) {
        NSLog("Location Allowed")
        //Start location services
        locationManager.startUpdatingLocation()
    } else {
        NSLog("Denied access: \(locationStatus)")
    }
}

Answer 1

按照丹的评论(谢谢)，我所要做的就是删除第一行，它显示坐标，我还没有弄清楚如何调用我的函数来更改标签文本，但我会在什么时候发布我明白了。编辑:下面发布了解决方案

我变了

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let locations = [CLLocation]()
    if (locationFixAchieved == false) {
        locationFixAchieved = true
        let locationArray = locations as NSArray
        let locationObj = locationArray.lastObject as? CLLocation
        let coord = locationObj?.coordinate

        print("Latitude: \(coord?.latitude)")
        print("Longitude: \(coord?.longitude)")
        //fvc.locationLabel.text = ("Location \r\n Latitude: \(coord?.latitude) \r\n Longitude: \(coord?.longitude)")
}

}

删除letlocations = [CLLocation]()

这就是我按下按钮时的调用方式。

func updateLocation() {
    let manager = CLLocationManager()
    let locValue : CLLocationCoordinate2D = (manager.location?.coordinate)!;
    let long = locValue.longitude
    let lat = locValue.latitude
    print(long)
    print(lat)
    locationLabel.text = ("Location \r\nLatitude: \(lat) \r\nLongitude: \(long)")
    }