CODEWITHSUNDEEP
iosswiftsprite-kit
ML.
ML.

Reputation: 599

Recognizing an action only when I tap the SKSpriteNode?

I have the following segment of code in which I want a tap to cause the ball to move in my screen.

   override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        moveBallUp()
        moveBallLeft()
        moveBallRight()
    }

    func moveBallUp() -> Void {
        ball.physicsBody?.applyImpulse(CGVectorMake(0, impulseFactor))
    }

    func moveBallLeft() -> Void {
        var random = -1 * CGFloat(Float(arc4random()))
        ball.physicsBody?.applyImpulse(CGVectorMake(random % impulseFactor, 0))
    }

    func moveBallRight() -> Void {
        var random = CGFloat(Float(arc4random()))
        ball.physicsBody?.applyImpulse(CGVectorMake(random % impulseFactor, 0))
    }

How do I make it such that only taps on the SKSpriteNode variable "ball" will cause the ball to move?

Upvotes: 1

Views: 37

Answers (1)

Whirlwind
Whirlwind

Reputation: 13675

You can set ball's name (ballNode.name = "ball") and access it like this:

touchesBegan:

 let location = (touch as UITouch).locationInNode(self)

 if let ball = self.nodeAtPoint(location) 
     if ball.name == "ball" {
        //move the ball
     }
 }

Another way would be using subclassing SKSpriteNode (and implementing touchesBegan method) like this:

class Ball : SKSpriteNode
{
    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
       //do your stuff here
    }
}

If you are subclassing SKSpriteNode you have to set userInteractionEnabled = true. you can do this in ball's init method or after you create Ball object.

Upvotes: 1

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