ios - Swift: Buttons not working inside UIScrollView -

i have scrollview. can scroll buttons don't allow press them(when press them don't anything). can fix this? here current code:

ps: i'm checking regularly if have question i'll answer.

class viewcontroller: uiviewcontroller {          @iboutlet weak var categoryscrollview: uiscrollview!         var categoryarr = ["button1","button2","button3","button4","button5", "button 6", "button 7", "button 8", "button 9", "button 10", "button 11", "button 12"]     var buttoncolors = [uicolor.greencolor(), uicolor.bluecolor(), uicolor.blackcolor(), uicolor.cyancolor(), uicolor.magentacolor(), uicolor.greencolor(), uicolor.bluecolor(), uicolor.blackcolor(), uicolor.cyancolor(), uicolor.magentacolor(), uicolor.blackcolor(), uicolor.browncolor()]     var buttonimages = [uiimage(named: "one"), uiimage(named: "two"), uiimage(named: "three"), uiimage(named: "playbuttonimage"), uiimage(named: "triangle"), uiimage(named: "playbuttonimage"), uiimage(named: "triangle"), uiimage(named: "playbuttonimage"), uiimage(named: "triangle"), uiimage(named: "playbuttonimage"), uiimage(named: "triangle"), uiimage(named: "playbuttonimage")]       let kpadding:cgfloat = 20       override func viewdidload() {         super.viewdidload()            let buttonsize = cgsizemake(categoryscrollview.bounds.size.width/2, categoryscrollview.bounds.size.height/2)//hal          let scrollingview = imagebuttonsview(buttonsize, buttoncount: 12)         categoryscrollview.contentsize = scrollingview.frame.size         categoryscrollview.addsubview(scrollingview)         categoryscrollview.showsverticalscrollindicator = false         categoryscrollview.delegate = self         categoryscrollview.pagingenabled = true         categoryscrollview.indicatorstyle = .default         categoryscrollview.contentoffset = cgpointmake(0, 0)         categoryscrollview.delayscontenttouches = false         categoryscrollview.userinteractionenabled = true;         categoryscrollview.exclusivetouch = true;         categoryscrollview.cancancelcontenttouches = true;         //categoryscrollview.clipstobounds = true      }       func imagebuttonsview(buttonsize:cgsize, buttoncount:int) -> uiview {             let buttonview = uiview()         buttonview.frame.origin = cgpointmake(50,142)         let padding = cgsizemake(kpadding, kpadding)         buttonview.frame.size.width = (buttonsize.width + padding.width) * cgfloat(buttoncount)         var buttonposition = cgpointmake(0, padding.height)         let buttonincrement = buttonsize.width + padding.width         in 0...(buttoncount - 1)  {               let button = uibutton(type: .custom)              buttonview.userinteractionenabled = true              button.frame.size = buttonsize             button.frame.origin = buttonposition             buttonposition.x = buttonposition.x + buttonincrement             button.settitle(categoryarr[i], forstate: uicontrolstate.normal)             let buttonimagesone = buttonimages[i]             button.setimage(buttonimagesone, forstate: .normal)             button.layer.cornerradius = 30             button.addtarget(self, action: "pressed:", forcontrolevents: uicontrolevents.touchupinside)             buttonview.addsubview(button)                  }         //buttonview.backgroundcolor = uicolor.redcolor()         categoryscrollview.bringsubviewtofront(buttonview)           return buttonview      }   }     extension viewcontroller:uiscrollviewdelegate{     func scrollviewdidenddecelerating(scrollview: uiscrollview) {              let index = round(scrollview.contentoffset.x / scrollview.frame.size.width)         print(index)     }        func pressed(/*sender: uibutton!*/) {          let vc = uiviewcontroller(nibname: "gridviewcontroller", bundle: nil)         self.presentviewcontroller(vc, animated: true, completion:nil)          //viewcontroller.hidden = true           } 

}

originally here, thought line

button.addtarget(self, action: "pressed:", forcontrolevents: uicontrolevents.touchupinside) 

should have said "pressed" without ":". turned out misunderstanding on part, sorry. should "pressed:".

instead, may related protocol extension , addtarget crashing nsinvalidargumentexception confusing.