退货方式Nill

Question

func getAddressFromLatLon() { 



    var locManager = CLLocationManager() 
    locManager.requestWhenInUseAuthorization() 
    var currentLocation = CLLocation() 

    if(CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse || 
     CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorized){ 

     currentLocation = locManager.location! 

    } 




    var center : CLLocationCoordinate2D = CLLocationCoordinate2D() 
    let lat: Double = Double(currentLocation.coordinate.latitude) 
    //21.228124 
    let lon: Double = Double(currentLocation.coordinate.longitude) 
    //72.833770 
    let ceo: CLGeocoder = CLGeocoder() 
    center.latitude = lat 
    center.longitude = lon 

    let geoCoder = CLGeocoder() 
    var placemark: AnyObject 
    var error: NSError 
    geoCoder.reverseGeocodeLocation(locManager.location!, completionHandler: { (placemark, error) -> Void in 
     if error != nil { 
      print("Error: \(error?.localizedDescription)") 
      return 
     } 
     if (placemark?.count)! > 0 { 
      let pm = (placemark?[0])! as CLPlacemark 
      //self.addressString = pm.locality! + pm.country! 
      let adress = pm.locality! + " " + pm.country! 

      print(adress) 
     } else { 
      print("Error with data") 
     } 
    }) 



} 

对不起，对于这个非常基本的问题。我对swift很陌生，我试图将地理代码反转为经纬度。我试图从反向地理编码返回地址，但它似乎返回零。有问题的函数是getAddressFromLatLon（），我尝试添加一个返回类型，但它返回零。当我在函数本身中打印时，会打印正确的值，但由于某种原因，我无法使地址返回，因此我可以将其传递给其他类/函数。

Answer 1

您需要保留从地理编码器获得的值，并且只需要使用它。

geoCoder.reverseGeocodeLocation(locManager.location!, completionHandler: { (placemark, error) -> Void in 
      if error != nil { 
       print("Error: \(error?.localizedDescription)") 
       return 
      } 
      if (placemark?.count)! > 0 { 
       let pm = (placemark?[0])! as CLPlacemark 
       //self.addressString = pm.locality! + pm.country! 
       let adress = pm.locality! + " " + pm.country! 

       // Store value into global object and you can use it... 
       // Another option, you can call one function and do necessary steps in it 
       mainLocality = pm.locality 
       mainCountry - pm.country  
       updateGeoLocation() // Call funcation 

       print(adress) 
} else { 
      print("Error with data") 
     } 
    }) 


func updateGeoLocation(){ 
    // You can use both object at here 
    // mainLocality 
    // mainCountry 
    // Do your stuff 

} 

Answer 2

您需要initilise CLLocation对象viewDidLoad中，并在其中获得位置coordinatites委托方法

Declate变量的当前位置

var currentLocation : CLLocation 

在viewDidLoad中

var locManager = CLLocationManager() 

    locationManager.delegate = self; 
      locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters 
      // ask permission - NOT NECESSARY IF YOU ALREADY ADDED NSLocationAlwaysUsageDescription IT UP INFO.PLIST 
      locationManager.requestAlwaysAuthorization() 
      // when in use foreground 
      locationManager.requestWhenInUseAuthorization() 
      locationManager.startUpdatingLocation() 

CLLocation的代表

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 

     // Get first location item returned from locations array 
     currentLocation = locations[0] 
     self.getAddressFromLatLon() // you can call here or whenever you want 
    } 

你如下

func getAddressFromLatLon() { 

    var center : CLLocationCoordinate2D = CLLocationCoordinate2D() 
    let lat: Double = Double(currentLocation.coordinate.latitude) 
    //21.228124 
    let lon: Double = Double(currentLocation.coordinate.longitude) 
    //72.833770 
    let ceo: CLGeocoder = CLGeocoder() 
    center.latitude = lat 
    center.longitude = lon 

    let geoCoder = CLGeocoder() 
    var placemark: AnyObject 
    var error: NSError 
    geoCoder.reverseGeocodeLocation(locManager.location!, completionHandler: { (placemark, error) -> Void in 
     if error != nil { 
      print("Error: \(error?.localizedDescription)") 
      return 
     } 
     if (placemark?.count)! > 0 { 
      let pm = (placemark?[0])! as CLPlacemark 
      //self.addressString = pm.locality! + pm.country! 
      let adress = pm.locality! + " " + pm.country! 

      print(adress) 
     } else { 
      print("Error with data") 
     } 
    }) 



}