ios - View doesn't display all subviews when viewDidAppear called again -

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goal of task display n-times subview in superview, , when open tab (i have tab bar controller) subviews must redraw.

now, when open application @ first time views draws in each other correctly. if open tab , again open previous subviews must redraw but, redraws first subview or two.. maybe constraints..

method draw subviews invoke in viewdidappear.

here code: 

import uikit import chameleonframework  class drawingvc: uiviewcontroller { let defaults = userdefaults.standard let countofviewskey = "countofviews"   var viewscount : int {     get{         return int(defaults.object(forkey: countofviewskey) as! string) ?? 0     } } var screenheight : int {     get{         return int(uiscreen.main.bounds.height)     } } var tabbarheight : int {     get{         return int((tabbarcontroller?.tabbar.frame.size.height)!)     } } var screenwidth : int {     get{         return int(uiscreen.main.bounds.width)     } }   func drawviews(count : int, view : uiview){     let inscribedview = uiview()     inscribedview.translatesautoresizingmaskintoconstraints = false     let sizeconstant = ((screenwidth / 2 ) / viewscount )     view.addsubview(inscribedview)      view.addconstraint(nslayoutconstraint.init(item: inscribedview, attribute: .top, relatedby: .equal, toitem: view, attribute: .top, multiplier: 1, constant: cgfloat(sizeconstant)))     view.addconstraint(nslayoutconstraint.init(item: inscribedview, attribute: .trailing, relatedby: .equal, toitem: view, attribute: .trailing, multiplier: 1, constant: -cgfloat(sizeconstant)))     view.addconstraint(nslayoutconstraint.init(item: inscribedview, attribute: .bottom, relatedby: .equal, toitem: view, attribute: .bottom, multiplier: 1, constant: -(cgfloat)(count == viewscount ? tabbarheight + sizeconstant : sizeconstant)))     view.addconstraint(nslayoutconstraint.init(item: inscribedview, attribute: .leading, relatedby: .equal, toitem: view, attribute: .leading, multiplier: 1, constant: cgfloat(sizeconstant)))      inscribedview.backgroundcolor = randomflatcolor()      if count == 0 {         return     }     var timer = timer.scheduledtimer(withtimeinterval: 0.3, repeats: false) { tim in          return self.drawviews(count: count - 1, view: view.subviews.first!)     } }   override func viewdidload() {     super.viewdidload()     print(viewscount)     // additional setup after loading view. }  override func viewdidappear(_ animated: bool) {     super.viewdidappear(animated)     drawviews(count: viewscount, view: view)     print(viewscount)  } override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  }





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