SKAction Completion Handlers; usage in Swift

Question

I\'m new to Swift and SpriteKit. A lot of the samples of SpriteKit Actions are in Objective C, which I can\'t map to, nor get working, in Swift.

If running an SKAct

Answer 1

In Swift you can use this extension:

extension SKNode
{
    func runAction( action: SKAction!, withKey: String!, optionalCompletion: dispatch_block_t? )
    {
        if let completion = optionalCompletion
        {
            let completionAction = SKAction.runBlock( completion )
            let compositeAction = SKAction.sequence([ action, completionAction ])
            runAction( compositeAction, withKey: withKey )
        }
        else
        {
            runAction( action, withKey: withKey )
        }
    }
}

Use for example as:

myShip.runAction(move,withKey:"swipeMove",optionalCompletion: {
  //Here action is ended..do whatever you want
}

Swift 3:

extension SKNode
{
    func run(action: SKAction!, withKey: String!, optionalCompletion:((Void) -> Void)?) {
        if let completion = optionalCompletion
        {
            let completionAction = SKAction.run(completion)
            let compositeAction = SKAction.sequence([ action, completionAction ])
            run(compositeAction, withKey: withKey )
        }
        else
        {
            run( action, withKey: withKey )
        }
    }

    func actionForKeyIsRunning(key: String) -> Bool {
            return self.action(forKey: key) != nil ? true : false
    }
}

Usage:

myShip.runAction(action: move, withKey:"swipeMove", optionalCompletion: {
       //Here action is ended..do whatever you want
}