Unable to add swipe recognizer to SKScene in Swift playground? - swift

Question

Ok, Im still a little new to how swift playgrounds work but I am trying to add a swipe gesture recognizer in Swift 3 to my swift playground. Following this http://www.spritekitlessons.com/gesture-recognizer-with-sprite-kit-and-swift/ I now have:
func swipedRight(sender:UISwipeGestureRecognizer){
print("swiped right")
}
func swipedLeft(sender:UISwipeGestureRecognizer){
print("swiped left")
}
func swipedUp(sender:UISwipeGestureRecognizer){
print("swiped up")
}
func swipedDown(sender:UISwipeGestureRecognizer){
print("swiped down")
}
let degree = CGFloat(M_PI_2) / 90
class GameScene: SKScene {
var selectedNode: SKNode?
var shakeAction: SKAction?
override func didMove(to view: SKView) {
/* Setup your scene here */
let swipeRight:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedRight:")))
swipeRight.direction = .right
view.addGestureRecognizer(swipeRight)
let swipeLeft:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedLeft:")))
swipeLeft.direction = .left
view.addGestureRecognizer(swipeLeft)
let swipeUp:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedUp:")))
swipeUp.direction = .up
view.addGestureRecognizer(swipeUp)
let swipeDown:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: Selector(("swipedDown:")))
swipeDown.direction = .down
view.addGestureRecognizer(swipeDown)
}
let frame = CGRect(x: 0, y: 0, width: 1000, height: 600) //view size
let view = SKView(frame: frame)
let scene = GameScene(size: frame.size)
view.presentScene(scene)
PlaygroundPage.current.liveView = view
This compiles, however when I swipe I get an unrecognized selector error even though I did include the functions with the selector:
I have tried placing the functions within the class as well. How can I add a swipe recognizer to a Swift playground SKScene?

Answer 1

You have selectors passed as strings, something is definitely wrong with them as said in error log
Try to use new selector syntax - #selector(methodName).
Example:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
/* Swift 3 */
let swipe = UISwipeGestureRecognizer(target: self, action:#selector(handleSwipe))
view.addGestureRecognizer(swipe)
}
func handleSwipe() {
print("Swiped!")
}
}
Using strings for selectors has been deprecated.
Using new selector syntax if the methodName() method doesn't exist, you'll get a compile error – your app won't crash because of "unrecognized selector".