ios - Receive user input from UISwipeGestureRecognizer and UIScrollView -

i trying create uiscrollview performs action on scrollviewwillbegindragging , recognizes left , right swipes using uiswipegesturerecognizer. when use scrollviewwillbegindragging function, desired result on left swipe function cannot tell whether performing right or left swipe. if set detailscrollview.userinteractionenabled = false, gesturerecognizer performs correctly view no longer scrolls. here code:

override func viewdidload() {     super.viewdidload()      var leftswipe = uiswipegesturerecognizer(target: self, action: selector("handleswipes:"))     var rightswipe = uiswipegesturerecognizer(target: self, action: selector("handleswipes:"))      leftswipe.direction = .left     rightswipe.direction = .right      view.addgesturerecognizer(leftswipe)     view.addgesturerecognizer(rightswipe) }   func gesturerecognizer(uigesturerecognizer,     shouldrecognizesimultaneouslywithgesturerecognizer:uigesturerecognizer) -> bool {         return true }  func scrollviewwillbegindragging(scrollview: uiscrollview) {     if (counter < buttons.count) {         serialselected(buttons[counter])         counter += 1     } }  func handleswipes(sender:uiswipegesturerecognizer) {     if (sender.direction == .left) {         println("swipe left")         var labelposition = cgpointmake(self.contentview.frame.origin.x - 50.0, self.contentview.frame.origin.y);         contentview.frame = cgrectmake( labelposition.x , labelposition.y , self.contentview.frame.size.width, self.contentview.frame.size.height)     }      if (sender.direction == .right) {         println("swipe right")         var labelposition = cgpointmake(self.contentview.frame.origin.x + 50.0, self.contentview.frame.origin.y);         contentview.frame = cgrectmake( labelposition.x , labelposition.y , self.contentview.frame.size.width, self.contentview.frame.size.height)     } } 

according source code, shouldrecognizesimultaneouslywithgesturerecognizer:uigesturerecognizer never invoked.

// make delegate class yourclass: parentclass, uigesturerecognizerdelegate  // reference delegate leftswipe.delegate = self rightswipe.delegate = self