AgoraVideoViewController.swift

var remoteUserIDs: [UInt] = []

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return remoteUserIDs.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "videoCell", for: indexPath)

    let remoteID = remoteUserIDs[indexPath.row]
    if let videoCell = cell as? VideoCollectionViewCell {
        let videoCanvas = AgoraRtcVideoCanvas()
        videoCanvas.uid = remoteID
        videoCanvas.view = videoCell.videoView
        videoCanvas.renderMode = .fit
        getAgoraEngine().setupRemoteVideo(videoCanvas)
    }

    return cell
}