Ios 无法强制转换类型为'__NSCFNumber'；至'；NSString'；斯威夫特2

我正在使用CLLocationmanager从app delegate获取纬度和经度 通过使用以下代码：

  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()
        locationManager.startUpdatingLocation()
    }

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

    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if (locationFixAchieved == false) {
            locationFixAchieved = true
            var locationArray = locations as NSArray
            var locationObj = locationArray.lastObject as! CLLocation
            var coord = locationObj.coordinate
            NSUserDefaults.standardUserDefaults().setObject(coord.latitude, forKey: "latitude")



            NSUserDefaults.standardUserDefaults().setObject(coord.longitude, forKey: "longitude")
            NSUserDefaults.standardUserDefaults().synchronize()
            print(coord.latitude)
            print(coord.longitude)
        }
    }

在地图视图中使用nsuserdefaults中的值时，请使用以下代码

   latitude = (NSUserDefaults.standardUserDefaults().objectForKey("latitude") as? NSString)! as String
        longitude = (NSUserDefaults.standardUserDefaults().objectForKey("longitude") as? NSString)! as String
        let latitude1 = (latitude as NSString).doubleValue
        let longitude1 = (longitude as NSString).doubleValue
        let location = CLLocationCoordinate2D(
            latitude: latitude1,
            longitude: longitude1
        )

---

我在

latitude=（NSUserDefaults.standardUserDefaults（）.objectForKey（“latitude”）处收到错误“无法将类型为“\uu NSCFNumber”（0x1944fb9f8）的值强制转换为“NSString”。（NSUserDefaults.standardUserDefaults（）.objectForKey（“latitude”）为？NSString）！as String

NSUserDefaults.standardUserDefaults（）。objectForKey（“经度”）是一个NSNumber，因此您只需执行以下操作：

let latitude = NSUserDefaults.standardUserDefaults().objectForKey("latitude")
let longitude = NSUserDefaults.standardUserDefaults().objectForKey("longitude")
    let latitude1 = latitude.doubleValue
    let longitude1 = longitude.doubleValue

此外，首先可以像这样设置用户默认值

let latitude: CLLocationDegrees = 1.0
NSUserDefaults.standardUserDefaults().setDouble("latitude", forKey: "latitude") 

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if (locationFixAchieved == false) {
        locationFixAchieved = true
        let locationArray = locations as NSArray
        let locationObj = locationArray.lastObject as! CLLocation
        let coord = locationObj.coordinate
        NSUserDefaults.standardUserDefaults().setDouble(coord.latitude, forKey: "latitude")
        NSUserDefaults.standardUserDefaults().setDouble(coord.longitude, forKey: "longitude")
        NSUserDefaults.standardUserDefaults().synchronize()
        print(coord.latitude)
        print(coord.longitude)
    }
}

---

在AppDelegate中，使用以下代码将纬度和经度保存在NSUserDefaults中，如下所示

let latitude: CLLocationDegrees = 1.0
NSUserDefaults.standardUserDefaults().setDouble("latitude", forKey: "latitude") 

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    if (locationFixAchieved == false) {
        locationFixAchieved = true
        let locationArray = locations as NSArray
        let locationObj = locationArray.lastObject as! CLLocation
        let coord = locationObj.coordinate
        NSUserDefaults.standardUserDefaults().setDouble(coord.latitude, forKey: "latitude")
        NSUserDefaults.standardUserDefaults().setDouble(coord.longitude, forKey: "longitude")
        NSUserDefaults.standardUserDefaults().synchronize()
        print(coord.latitude)
        print(coord.longitude)
    }
}

要获取该值，请在viewcontroller文件中使用此代码

 override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    let latitude2 = NSUserDefaults.standardUserDefaults().objectForKey("latitude")
    let longitude2 = NSUserDefaults.standardUserDefaults().objectForKey("longitude")
    let latitude1  = latitude2!.doubleValue
    let longitude1 = longitude2!.doubleValue
    let location = CLLocationCoordinate2D(
        latitude: latitude1,
        longitude: longitude1
    )


}

---

coord.latitude

是一个

double

，而不是

字符串。因此，当您将其保存到
NSUserDefaults
中时，它将转换为
NSNumber
。所以这应该可以做到：
让latitude1=（latitude为NSNumber）。doubleValue
您正在将该值保存为一个数字，并尝试将其读回字符串。到底是什么问题？谢谢，问题已经解决了。它显示无法将“AnyObject”类型的值赋给“String”类型