使用prepareForReuse()方法在UICollectionViewCell被重复使用时对VideoCanvas进行重置。

示例代码：

class VideoCollectionViewCell: UICollectionViewCell {

var agoraKit: AgoraRtcEngineKit!
var videoCanvas: AgoraRtcVideoCanvas!

override func prepareForReuse() {
    super.prepareForReuse()
    
    videoCanvas.view?.removeFromSuperview()
    agoraKit.setupLocalVideo(nil)
    agoraKit.setupRemoteVideo(nil, uid: 0)
    agoraKit.leaveChannel(nil)
    agoraKit = nil
    videoCanvas = nil
}

func setupAgoraKit() {
    agoraKit = AgoraRtcEngineKit.sharedEngine(withAppId: "YOUR_APP_ID", delegate: nil)
    agoraKit.enableVideo()
    agoraKit.setChannelProfile(.liveBroadcasting)
}

func setupVideoCanvas() {
    videoCanvas = AgoraRtcVideoCanvas()
    videoCanvas.uid = 0
    videoCanvas.renderMode = .hidden
    videoCanvas.view = // Add your video view here
}

func joinChannel() {
    agoraKit.joinChannel(byToken: "YOUR_TOKEN", channelId: "YOUR_CHANNEL_ID", info: nil, uid: 0, joinSuccess: nil)
}

func setupRemoteVideo() {
    agoraKit.setupRemoteVideo(videoCanvas)
}

}