CODEWITHSUNDEEP
iosswiftsprite-kitswift2skspritenode
Frankeex
Frankeex

Reputation: 449

Dragging an SKSpriteNode only when touched

I have an SKSpriteNode that I want to drag around the screen via touchesMoved. However, I do not want the sprite to move if the touch didn't originate on the location of the sprite in the first place (no skipping around the scene).

I have a intermittent solution but believe something is both more elegant and more functional as this solution doesn't work correctly - it appears as if the sprite location doesn't keep up with the touch location if the user drags the sprite very fast.

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

        var touchPoint : CGPoint = location
        var muncherRect = muncherMan.frame
        if (CGRectContainsPoint(muncherRect, touchPoint)) {
            muncherMan.position = location
        } else {

        }
    }
}

Upvotes: 0

Views: 143

Answers (1)

WangYudong
WangYudong

Reputation: 4413

You can implement these three methods to achieve what you want: touchesBegan, touchesMoved and touchesEnded. When you touched muncherMan, set muncherManTouched true which indicated muncherMan would probably be moved in the next frame. When finishing the move or touch, set muncherManTouched false and wait for the next touch.

Here's the example code. I add a name for muncherMan so we can determine which node is being touched in touchesBegan.

var muncherManTouched = false
override func didMoveToView(view: SKView) {
    /* Setup your scene here */
    ...
    muncherMan.name = "muncherMan"
    self.addChild(muncherMan)
}

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    /* Called when a touch begins */ 
    for touch in touches {
        let location = touch.locationInNode(self)
        let nodeTouched = self.nodeAtPoint(location)
        if (nodeTouched.name == "muncherMan") {
            muncherManTouched = true
        }
    }
}

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
    for touch in touches {
        let location = touch.locationInNode(self)
        if (muncherManTouched == true) {
            muncherMan.position = location
        }
    }
}

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
    muncherManTouched = false
}

Upvotes: 2

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