swift - Drawing a line on view/imageview in iOS/swift3 -

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i found question similar own here: draw line realtime swift 3.0

after piecing have in own program, not sure make call drawlinefrom(frompoint: cgpoint, topoint: cgpoint) in code can draw. app runs, still can't draw. code below.

override func touchesbegan(_ touches: set<uitouch>, event: uievent?) {     swiped = false     if let touch = touches.first {         lastpoint = touch.location(in: self.view)     } }  func drawlinefrom(frompoint: cgpoint, topoint: cgpoint) {     uigraphicsbeginimagecontextwithoptions(view.bounds.size, false, 0)      tempimageview.image?.draw(in: view.bounds)      let context = uigraphicsgetcurrentcontext()      context?.move(to: frompoint)     context?.addline(to: topoint)      context?.setlinecap(cglinecap.round)     context?.setlinewidth(brushwidth)     context?.setstrokecolor(red: red, green: green, blue: blue, alpha: 1.0)     context?.setblendmode(cgblendmode.normal)     context?.strokepath()      tempimageview.image = uigraphicsgetimagefromcurrentimagecontext()     tempimageview.alpha = opacity     uigraphicsendimagecontext() }  override func touchesmoved(_ touches: set<uitouch>, event: uievent?) {     swiped = true     if let touch = touches.first {         let currentpoint = touch.location(in: view)         drawlinefrom(frompoint: lastpoint, topoint: currentpoint)          lastpoint = currentpoint     } }  override func touchesended(_ touches: set<uitouch>, event: uievent?) {     if !swiped {         // draw single point         self.drawlinefrom(frompoint: lastpoint, topoint: lastpoint)     } }  let tempimageview = uiimageview()  override func viewdidload() {     super.viewdidload()      view.backgroundcolor = uicolor(r: 21, g: 221, b: 125)      //view.addsubview(titlelabel)     //view.addsubview(learnbutton)     //view.addsubview(drawbutton)     //view.addsubview(mainimageview)     view.addsubview(tempimageview)       //setuptitlelabel()     //setuplearnbutton()     //setupdrawbutton()     setupimageviews()      self.navigationcontroller?.isnavigationbarhidden = true }  func setupimageviews() {     tempimageview.widthanchor.constraint(equalto: view.widthanchor)     tempimageview.heightanchor.constraint(equalto: view.heightanchor) }


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