CODEWITHSUNDEEP
swifttouchskspritenodetouchesbegantouchesmoved
Pete
Pete

Reputation: 613

Moving SKSpriteNode over screen

I want to move an SKSpriteNode over the screen with touch. The issue I have is that if I lock onto one sprite and then my finger drags it over another sprite the first one is let go and my finger starts to drag the second one. But once I touch the first sprite this is the only one I want to move. There must be a simple way to resolve this? 

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    /* Called when a touch begins */
    let touch: UITouch = touches.first as UITouch!
    touchLocation = touch.locationInNode(self)
}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    let touch: UITouch = touches.first as UITouch!
    let newTouchLocation = touch.locationInNode(self)
    let targetNode = self.nodeAtPoint(touchLocation)
    if targetNode.physicsBody!.categoryBitMask != PhysicsCategory.Ball {
    targetNode.runAction(SKAction.moveBy(CGVector(point: newTouchLocation - touchLocation), duration: 0.0))
    touchLocation = newTouchLocation
    }
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    //I don't do anything with this yet
}

Upvotes: 0

Views: 627

Answers (2)

Pete
Pete

Reputation: 613

Thanks to TheCodeComposer, I found the solution:

var targetNode: SKNode!

  override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        /* Called when a touch begins */
        let touch: UITouch = touches.first as UITouch!
        touchLocation = touch.locationInNode(self)
        targetNode = self.nodeAtPoint(touchLocation)
        objectTouched(touch.locationInNode(self))
    }

    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let touch: UITouch = touches.first as UITouch!
        let newTouchLocation = touch.locationInNode(self)
//        let targetNode = self.nodeAtPoint(touchLocation)
        if targetNode.physicsBody!.categoryBitMask != PhysicsCategory.Ball {
        targetNode.runAction(SKAction.moveBy(CGVector(point: newTouchLocation - touchLocation), duration: 0.0))
        touchLocation = newTouchLocation
        }
    }

I only define

targetNode

once and then continue to use it instead of redefining it in touchesMoved:

Upvotes: 1

TheCodeComposer
TheCodeComposer

Reputation: 711

This is happening because your touchesMoved function is running every time your finger moves and if your finger moves over a new node, that node will be assigned to targetNode. You can fix this by changing this line:

let targetNode = self.nodeAtPoint(touchLocation)

To this:

let targetNode = self.nodeAtPoint(touch)

This way the node at the first touch will be the one that follows your finger and not the one at the last touch.

Upvotes: 1

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