"downcast from CLplacemark? to Clplacemark only unwraps optional"(swift2)

Question

how to fix this error :

"downcast from CLplacemark? to Clplacemark only unwraps optional"

so i use this code :

if let p = CLPlacemark(placemark: placemarks.first as? CLPlacemark){}

and change placemarks[0] array but not work

and my code is :

CLGeocoder().reverseGeocodeLocation(userLocation) { (placemarks, error) -> Void in

    if error == nil {

       if let p = CLPlacemark(placemark: placemarks[0] as? CLPlacemark){

            print(p)
            self.adsresslabel.text = "\(p.administrativeArea)\(p.postalCode)\(p.country)"
        }


    }else {
        print (error)
    }


    }

at this code :

if let p = CLPlacemark(placemark: placemarks[0] as? CLPlacemark)

i have error about

 "downcast from CLplacemark? to Clplacemark only unwraps optional"

how to fix this error ?!

score 0 · Answer 1 · answered Jan 17 '16 at 01:30

If you don't actually need to make a copy of the first placemark, you only need to do :

if let p = placemarks.first
{
        print(p)
        self.adsresslabel.text = "\(p.administrativeArea)\(p.postalCode)\(p.country)"
}

On the other hand, if you do need it to be a copy:

if let p0 = placemarks.first
{ 
        let p = CLPlacemark(placemark:p0)
        print(p)
        self.adsresslabel.text = "\(p.administrativeArea)\(p.postalCode)\(p.country)"
}

score 0 · Answer 2 · answered Jan 18 '16 at 08:30

The completion handler of reverseGeocodeLocation:completionHandler is declared as

typealias CLGeocodeCompletionHandler = ([CLPlacemark]?, NSError?) -> Void

The placemarks are an optional array of CLPlacemark items therefore a down cast is not needed. You have only to check if the array is not nil and not empty as described in the answer of Alain T.

"downcast from CLplacemark? to Clplacemark only unwraps optional"(swift2)

2 Answers2