ios - When Using JSQMessagesViewController the UI does not appear -

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i trying implement jsqmessagesviewcontroller, , following ray wenderlich tutorial(https://www.raywenderlich.com/122148/firebase-tutorial-real-time-chat), ui not appearing on view controller, blank. pod file.

source 'https://github.com/cocoapods/specs.git' use_frameworks! target "sell goods"     pod 'firebase'     pod 'firebase/storage'     pod 'firebase/database'     pod 'google/signin'     pod 'jsqmessagesviewcontroller' end

i have tried using bridging header did not work, , followed tutorial step step.

segue chatviewcontroller

override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {     guard let editingvc = segue.destinationviewcontroller as? chatsviewcontroller         else {             preconditionfailure("bad")         }     editingvc.senderid = userid     editingvc.senderdisplayname = username }

chatviewcontroller

import firebase import jsqmessagesviewcontroller  class chatsviewcontroller: jsqmessagesviewcontroller { var messages = [jsqmessage]() var outgoingbubbleimageview: jsqmessagesbubbleimage! var incomingbubbleimageview: jsqmessagesbubbleimage! override func viewdidload() {     title = "chatchat"     setupbubbles()     //collectionview!.collectionviewlayout.incomingavatarviewsize = cgsizezero     //collectionview!.collectionviewlayout.outgoingavatarviewsize = cgsizezero      // additional setup after loading view. }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  override func viewdidappear(animated: bool) {     resetscreen = true } private func setupbubbles() {     let factory = jsqmessagesbubbleimagefactory()     outgoingbubbleimageview = factory.outgoingmessagesbubbleimagewithcolor(         uicolor.jsq_messagebubblebluecolor())     incomingbubbleimageview = factory.incomingmessagesbubbleimagewithcolor(         uicolor.jsq_messagebubblelightgraycolor()) } override func collectionview(collectionview: jsqmessagescollectionview!,                              messagebubbleimagedataforitematindexpath indexpath: nsindexpath!) -> jsqmessagebubbleimagedatasource! {     let message = messages[indexpath.item]     if message.senderid == senderid {         return outgoingbubbleimageview     } else {         return incomingbubbleimageview     } }  override func collectionview(collectionview: jsqmessagescollectionview!,                              messagedataforitematindexpath indexpath: nsindexpath!) -> jsqmessagedata! {     return messages[indexpath.item] }  override func collectionview(collectionview: uicollectionview,                              numberofitemsinsection section: int) -> int {     return messages.count } override func collectionview(collectionview: jsqmessagescollectionview!,                              avatarimagedataforitematindexpath indexpath: nsindexpath!) -> jsqmessageavatarimagedatasource! {     return nil }  }

you must call super.viewdidload & super.viewdiddisappear


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