Swift - required method not implemented: -[JSQMessagesViewController collectionView

Question

I am migrating an iOS app to Swift 3 and I keep having this error message on my ChatViewController.

2017-02-21 16:40:40.599 Jaco[52613:2864859] *** Assertion failure in -[Jaco.ChatViewController collectionView:messageDataForItemAtIndexPath:], /Users/Royal/dev/jab/ios/Pods/JSQMessagesViewController/JSQMessagesViewController/Controllers/JSQMessagesViewController.m:491
2017-02-21 16:40:40.609 Jaco[52613:2864859] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'ERROR: required method not implemented: -[JSQMessagesViewController collectionView:messageDataForItemAtIndexPath:]'

Here is part of my code

  // DATA SOURCE 1
  func collectionView(collectionView: JSQMessagesCollectionView!,
                      messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
    let data = self.messages[indexPath.item]
    return data
  }


  // DATA SOURCE 2
  override func collectionView(_ collectionView: UICollectionView,
                               numberOfItemsInSection section: Int) -> Int {
    return messages.count
  }

I tried adding "override" but the error message is still there.

Any ideas how to fix this? Thanks for your help!

Answer 1

Change

func collectionView(collectionView: JSQMessagesCollectionView

to

func collectionView(_ collectionView: JSQMessagesCollectionView