CODEWITHSUNDEEP
swiftsprite-kit
Jennifer
Jennifer

Reputation: 1852

Unable to detect if the spritenode is moved to the left or right in spritekit (SWIFT)

Currently I'm making a game with swift spritekit and want the character look left when the finger moves the character to the left in touchesMoved. Since, I started development with swift and spritekit just a few days ago I find it hard to implement this action. How can I detect left or right in the code below ?

   override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
        for touch in (touches as! Set<UITouch>) {
            let location = touch.locationInNode(self)

            playerSprite.position.x = touch.locationInNode(self).x

        }

Upvotes: 0

Views: 413

Answers (2)

Christian
Christian

Reputation: 22343

You can check if the current x-position of your touch is bigger or smaller than the position before.

To achieve that, you should create a variable to store the location of your last touch. For example:

var lastXTouch:CGFloat = -1

Then in the touchesMoved-method you check the location and check if the previous location was more on the left or more on the right side:

override func touchesMoved(touches: Set<NSObject>, withEvent event: UIEvent) {
    for touch in (touches as! Set<UITouch>) {
        let location = touch.locationInNode(self)
        if lastXTouch > location.x{
            //Finger was moved to the left. Turn sprite to the left.
        }else{
            //Finger was moved to the right. Turn sprite to the right.
        }
        lastXTouch = location.x
        playerSprite.position.x = touch.locationInNode(self).x

    }

Upvotes: 2

MaxKargin
MaxKargin

Reputation: 1545

Put in a gesture recognizer when you want to be able to detect the swipe:

var leftSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipe:"))
leftSwipe.direction = .Left

var rightSwipe = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipe:"))
rightSwipe.direction = .Right

self.view.addGestureRecognizer(leftSwipe)
self.view.addGestureRecognizer(rightSwipe)

Then, you need to implement the handler method that is called - handleSwipe:

func handleSwipe(sender:UISwipeGestureRecognizer){
   if (sender.direction == .Left){
       //swiped left
       //change your texture here on the sprite node to make it look left
   }
   if (sender.direction == .Right){
       //swipe right
       //change texture here on sprite to make it look right
   }
}

Upvotes: 1

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