Optional Binding (String: AnyObject) to [String]

Question

I have a JSON object/dictionary I retrieved from AFNetworking and I want to conditionally unwrap the key into an array of strings.

var person: [String : AnyObject] = ...

if let interests = person["interests"] as [String]{
   // Do something
}

I get the following error message: (String : AnyObject) is not convertible to [String]. I don't think I can typecast person to [String : Any] because it comes out as [String : AnyObject] from the AFNetworking framework. Any ideas would be appreciated.

You are not telling the truth. No one can reproduce based on what you've shown. Show your _real_ code. Do not type by hand: copy and paste so that we see _exactly_ what you are saying. — matt, Dec 15 '14 at 18:15
@matt. You can easily reproduce the code. I've written basically exactly what i posted in `Playground` and took a screenshot. http://i.imgur.com/2aSAjRe.png — blee908, Dec 15 '14 at 18:18
Because you didn't import UIKit. See my screenshot which trumps your screenshot! — matt, Dec 15 '14 at 18:21
@matt I want to solve this issue just as much as anyone else, I'm still getting a compile error: http://i.imgur.com/gu9wtHe.png — blee908, Dec 15 '14 at 18:26

score 3 · Accepted Answer · answered Dec 15 '14 at 18:53

Update your Xcode. You are using an old version. Prior to Xcode 6.1, String was not considered an object type: you had to use NSString instead:

if let interests = person["interests"] as? [NSString] {

Apple fixed that issue, so this now works with Xcode 6.1:

if let interests = person["interests"] as? [String] {

Since Swift is rapidly evolving, you are advised to keep up to date with the latest released verison of Xcode, which as of this writing is Xcode 6.1.1.

Optional Binding (String: AnyObject) to [String]

1 Answers1