ios - How to hide collection view while table view view scrolling in swift -

i adjust while scrolling down table view, want hide collection view in swift, , when scroll open instagram. although found navigation bar , table view , couldn't find collection view , table view. here navigation bar , table view: https://www.natashatherobot.com/navigation-bar-interactions-ios8/. help. here simple code:

class viewcontroller: uiviewcontroller, uicollectionviewdelegateflowlayout, uicollectionviewdatasource,uitableviewdelegate, uitableviewdatasource  {  var collectionview: uicollectionview! var tableview: uitableview  =   uitableview() var items: [string] = ["viper", "x", "games","viper", "x", "games","viper", "x", "games","viper", "x", "games","viper", "x", "games", "x", "games","viper", "x", "games","viper", "x", "games","viper", "x", "games","viper", "x", "games", "x", "games","viper", "x", "games","viper", "x", "games","viper", "x", "games","viper", "x", "games"] override func viewdidload() {     super.viewdidload()     // additional setup after loading view, typically nib.     let layout: uicollectionviewflowlayout = uicollectionviewflowlayout()     layout.sectioninset = uiedgeinsets(top: 20, left: 10, bottom: 10, right: 10)     layout.itemsize = cgsize(width: 90, height: 120)     let :cgrect = cgrect(x: 0, y: 0, width: self.view.frame.size.width, height: 130)      collectionview = uicollectionview(frame: a, collectionviewlayout: layout)     collectionview.datasource = self     collectionview.delegate = self     collectionview.registerclass(uicollectionviewcell.self, forcellwithreuseidentifier: "cell")     collectionview.backgroundcolor = uicolor.whitecolor()     self.view.addsubview(collectionview)      tableview.frame         =   cgrectmake(0, 130 , self.view.frame.size.width , self.view.frame.size.height - 130);     tableview.delegate      =   self     tableview.datasource    =   self      tableview.registerclass(uitableviewcell.self, forcellreuseidentifier: "cell")      self.view.addsubview(tableview)  } override func viewdidappear(animated: bool) {     super.viewdidappear(animated)  }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. } func collectionview(collectionview: uicollectionview, numberofitemsinsection section: int) -> int {     return 4 }  func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {     let cell = collectionview.dequeuereusablecellwithreuseidentifier("cell", forindexpath: indexpath)     cell.backgroundcolor = uicolor.orangecolor()     return cell } func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {     return self.items.count }  func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      let cell:uitableviewcell = tableview.dequeuereusablecellwithidentifier("cell")! uitableviewcell      cell.textlabel?.text = self.items[indexpath.row]      return cell  }  func tableview(tableview: uitableview, didselectrowatindexpath indexpath: nsindexpath) {     print("you selected cell #\(indexpath.row)!") } 

}