ios - How to add action to a subviews Attributes Swift? -


this question has answer here:

i relatively new swift , add series of action custom uiview button

here's code when ever press button error.

please tell me best practice modelling this.

class cameraview: uiview {      var camerabutton : uibutton?      convenience init() {         self.init(frame: cgrectzero)         self.backgroundcolor = uicolor.clearcolor()          camerabutton = uibutton()      required init?(coder adecoder: nscoder) {         fatalerror("init(coder:) has not been implemented")     }      override init(frame: cgrect) {         super.init(frame: frame)     }       func setbutton(button : uibutton){         self.camerabutton = button     }       func setupmyview(){         self.camerabutton = uibutton()         self.camerabutton?.layer.cornerradius = 30         self.camerabutton?.layer.borderwidth = 5         self.camerabutton?.backgroundcolor = uicolor.clearcolor()         self.camerabutton?.layer.bordercolor = uicolor.whitecolor().cgcolor          self.addsubview(camerabutton!)     }  }   viewcontroller.swift   import uikit  class viewcontroller: uiviewcontroller {      var cameraview : cameraview?      override func viewdidload() {         super.viewdidload()          cameraview = cameraview()          cameraview?.camerabutton?.addtarget(self, action: "pressed", forcontrolevents: .touchupinside)          self.view = cameraview      }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }       func pressed(sender : anyobject!){         print("button pressed")         let alert = uialertcontroller(title: "alert", message: "another alert", preferredstyle: .alert)         let action = uialertaction(title: "ok", style: .default, handler: nil)         alert.addaction(action)          self.presentviewcontroller(alert, animated: true , completion: nil)     }  }

error 

 2016-01-16 14:00:42.023 tpproject[4194:1442964] -[tpproject.viewcontroller pressed]: unrecognized selector sent instance 0x125655a30 2016-01-16 14:00:42.028 tpproject[4194:1442964] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[tpproject.viewcontroller pressed]: unrecognized selector sent instance 0x125655a30' *** first throw call stack: (0x183d39900 0x1833a7f80 0x183d4061c 0x183d3d5b8 0x183c4168c 0x188a63e50 0x188a63dcc 0x188a4ba88 0x188a636e4 0x188a63314 0x188a5be30 0x188a2c4cc 0x188a2a794 0x183cf0efc 0x183cf0990 0x183cee690 0x183c1d680 0x18512c088 0x188a94d90 0x1000adf64 0x1837be8b8) libc++abi.dylib: terminating uncaught exception of type nsexception

i figured out solution. had add : action

from line 

cameraview?.camerabutton?.addtarget(self, action: "pressed", forcontrolevents: .touchupinside)

to 

cameraview?.camerabutton?.addtarget(self, action: "pressed:", forcontrolevents: .touchupinside)

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