ios - NSInvalidArgumentException 与使用 JSQMessagesViewController

Question

我是 swift 的新手 :D，正在使用 JSQMessagesViewController 开发一个简单的聊天应用程序。我阅读并遵循了 JSQMessagesViewController 示例项目 ( https://www.syncano.io/blog/create-ios-chat-app-part1/ )，但我的代码出现错误。

class ChatRoomViewController: JSQMessagesViewController {

    let incomingBubble = JSQMessagesBubbleImageFactory().incomingMessagesBubbleImageWithColor(UIColor(red: 10/255, green: 180/255, blue: 230/255, alpha: 1.0))
    let outgoingBubble = JSQMessagesBubbleImageFactory().outgoingMessagesBubbleImageWithColor(UIColor.lightGrayColor())
    var messages = [JSQMessage]()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.setup()
        self.addDemoMessages()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func reloadMessagesView() {
        self.collectionView?.reloadData()
    }

    func gotoReserve() {

        let nextViewController = ReserveViewController(nibName: "ReserveViewController", bundle: nil)

        self.navigationController!.pushViewController(nextViewController, animated: true)
    }
}

//MARK - Setup
extension ChatRoomViewController {
    func addDemoMessages() {
        let message = JSQMessage(senderId: "zzz", displayName: "aaa", text: "asasd")
        self.messages.append(message)

        self.reloadMessagesView()
    }

    func setup() {
        self.senderId = "user"
        self.senderDisplayName = "user"
    }
}
//MARK - Data Source
extension ChatRoomViewController {

    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.messages.count
    }

    override func collectionView(collectionView: JSQMessagesCollectionView!, messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
        let data = self.messages[indexPath.row]
        return data
    }

    override func collectionView(collectionView: JSQMessagesCollectionView!, didDeleteMessageAtIndexPath indexPath: NSIndexPath!) {
        self.messages.removeAtIndex(indexPath.row)
    }

    override func collectionView(collectionView: JSQMessagesCollectionView!, messageBubbleImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageBubbleImageDataSource! {
        let data = messages[indexPath.row]
        switch(data.senderId) {
        case self.senderId:
            return self.outgoingBubble
        default:
            return self.incomingBubble
        }
    }

    override func collectionView(collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
        return nil
    }
}
//MARK - Toolbar
extension ChatRoomViewController {
    override func didPressSendButton(button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: NSDate!) {
        let message = JSQMessage(senderId: senderId, senderDisplayName: senderDisplayName, date: date, text: text)
        self.messages += [message]
        self.finishSendingMessage()
    }

    override func didPressAccessoryButton(sender: UIButton!) {

    }
}

当我运行它时，错误信息说

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[JSQMessage messageHash]: unrecognized selector sent to instance 0x7fdf0a6e1f60'

应用终止。

但是删除后运行良好

self.addDemoMessages()

viewDidLoad() 中的代码。所以我猜这段代码发生了错误，但我不知道如何修复 :( 我该如何修复它？

Answer 1

当我对 JSQMessage 对象进行子类化时，我遇到了类似的问题。如果您这样做，您只需要确保为消息数据实现 has。我只需要将此方法添加到我的 message 对象

func messageHash() -> UInt {
    return UInt(self.hash)
}

希望对您有所帮助👻