block in Swift : return error “ is not convertible to ”

Question

I made a mistake but I cannot see how to solve it. I would like to load all the assets from GameScene and send a Bool in a completion method. I use typealias : should it be renamed twice for the two files (gameScene and gameController)?

Then I have got an error on this line GameScene.loadSceneAssetsWithCompletionHandler{ :

((Bool) -> Void) is not convertible to 'GameScene'

Here is the code :

    //gameController:
    typealias OnComplete = (Bool) -> ()
    override func viewDidLoad() {
        super.viewDidLoad()

        GameScene.loadSceneAssetsWithCompletionHandler{ (success:Bool)->Void in
            println("2/ yes")
            return
        }



    //gameScene : rewrite typealias? 
    typealias OnComplete = (Bool) -> ()

    func loadSceneAssetsWithCompletionHandler( completion:OnComplete ) {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { () -> Void in
            self.loadSceneAssets()

            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                println("1/ yes")
                completion(true)
            })//main
        })//global
    }

I read some threads that said to add a "return", but it does not solve the error here.

Thanks

Answer 1

It's almost working, but you've got a couple things going wrong here. First of all, you can't redeclare a typealias . Second of all you're calling loadSceneAssetsWithCompletionHandler as a class function when it's set up as an instance function. Note changes:

typealias OnComplete = (Bool) -> ()
class GameController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        GameScene.loadSceneAssetsWithCompletionHandler { success in
            println("2/ yes")
            return
        }
    }

}


class GameScene:  UIViewController {

    func loadSceneAssets() {

    }

    class func loadSceneAssetsWithCompletionHandler( completion:OnComplete ) {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {
           let gameScene = GameScene()
           gameScene.loadSceneAssets()

            dispatch_async(dispatch_get_main_queue()) {
                println("1/ yes")
                completion(true)
            }
        }
    }
}