Sprite Kit Button touch location error | Swift -

i'm trying make button that's sklabelnode. when gets pressed, it's supposed change scenes, there wrong line location declared.

override func touchesbegan(touches: set<nsobject>, withevent event: uievent) {     super.touchesbegan(touches, withevent: event)      let location = touches.locationinnode(self)     let touchednode = self.nodeatpoint(location)      if touchednode.name == "startgamebutton" {         let transition = sktransition.revealwithdirection(sktransitiondirection.down, duration: 1.0)          let scene = gamescene(size: self.scene.size)         scene.scalemode = skscenescalemode.aspectfill          self.scene.view.presentscene(scene, transition: transition)     } } 

the error here on line.

let location = touches.locationinnode(self) 

it reads

'set< nsobject>' not have member named 'locationinnode'

i'm not sure how fix it. i've looked @ lot of working button templates, mine has error.

the problem error states - set<nsobject> doesn't have method named locationinnode. need retrieve object out of set; check it's uitouch object; if is, can use touch location. try:

override func touchesbegan(touches: set<nsobject>, withevent event: uievent) {     if let location = (touches.first as? uitouch)?.locationinnode(self) {         // ...     } } 

or

if let touch = touches.first as? uitouch {     let location = touch.locationinnode(self)     // ... }