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我正在努力寻找一种在 MessageKit 聊天视图控制器中显示用户名的方法。我从示例项目中复制了 MessagesDataSource，但没有成功。这是我的 MessagesDataSource 目前的样子：

extension ChatViewController: MessagesDataSource {

    func currentSender() -> Sender {
        //guard let currentUserID = User.current?.key else {return nil}
        let newSender = Sender(id: (User.current?.key)!, displayName: (User.current?.username)!)
        return newSender
    }

    func numberOfSections(in messagesCollectionView: MessagesCollectionView) -> Int {
        //return 1
        return messages.count
    }

    func messageForItem(at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> MessageType {

        return messages[indexPath.section]
    }

    func cellTopLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {

        return NSAttributedString(string: MessageKitDateFormatter.shared.string(from: message.sentDate), attributes: [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 10), NSAttributedString.Key.foregroundColor: UIColor.darkGray])
    }

    func messageTopLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
        let name = message.sender.displayName
        return NSAttributedString(string: name, attributes: [NSAttributedString.Key.font: UIFont.preferredFont(forTextStyle: .caption1)])
    }

    func messageBottomLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {

        let dateString = formatter.string(from: message.sentDate)
        return NSAttributedString(string: dateString, attributes: [NSAttributedString.Key.font: UIFont.preferredFont(forTextStyle: .caption2)])
    }
}

let name = message.sender.displayName如果我在控制台输出中显示正确的用户名之后放置一个断点。但是，它仍然没有出现在聊天记录中。聊天视图仍然只显示头像和消息，没有其他内容。

我错过了什么？

谢谢

4

2 回答 2

4

虽然我不知道MessageKit你使用的是什么版本，但我很确定如果你尝试过这个，一切都会正常工作，

func cellTopLabelAttributedText(for message: MessageType, at indexPath: IndexPath) -> NSAttributedString? {
    let name = message.sender.displayName
    return NSAttributedString(
      string: name,
      attributes: [
        .font: UIFont.preferredFont(forTextStyle: .caption1),
        .foregroundColor: UIColor(white: 0.3, alpha: 1)
      ]
    )
  }

因为我没有看到任何dataSource被调用的函数messageTopLabelAttributedText

于 2019-03-02T20:35:10.283 回答
3

请在下面添加此代码：

func cellTopLabelHeight(for message: MessageType, at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> CGFloat {
    return 35
}
于 2020-02-25T08:21:31.743 回答