Swift - JSQMessagesViewController 显示传入的头像电子邮件或用户名

Question

我正在开发一个聊天应用程序，我有这个

现在的问题是如何在演示中像这样在消息气泡顶部显示用户名？ https://raw.githubusercontent.com/jessesquires/JSQMessagesViewController/develop/Screenshots/screenshot2.png

我正在寻找 override func collectionView(collectionView: JSQMessagesCollectionView!, senderDisplayNameDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! 但我认为这是不可能的。您认为这里的解决方案是什么？谢谢!

Answer 1

为了查看传入消息顶部的用户名，JSQ 具有以下方法。

//MARK: To View  usernames above bubbles

override func collectionView(collectionView: JSQMessagesCollectionView!, attributedTextForMessageBubbleTopLabelAtIndexPath indexPath: NSIndexPath!) -> NSAttributedString! {
    let message = messages[indexPath.item];

    // Sent by me, skip
    if message.sender() == sender {
        return nil;
    }

    // Same as previous sender, skip
    if indexPath.item > 0 {
        let previousMessage = messages[indexPath.item - 1];
        if previousMessage.sender() == message.sender() {
            return nil;
        }
    }

    return NSAttributedString(string:message.sender())
}

override func collectionView(collectionView: JSQMessagesCollectionView!, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout!, heightForMessageBubbleTopLabelAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
    let message = messages[indexPath.item]

    // Sent by me, skip
    if message.sender() == sender {
        return CGFloat(0.0);
    }

    // Same as previous sender, skip
    if indexPath.item > 0 {
        let previousMessage = messages[indexPath.item - 1];
        if previousMessage.sender() == message.sender() {
            return CGFloat(0.0);
        }
    }

    return kJSQMessagesCollectionViewCellLabelHeightDefault
}

上面的代码对我有用，我希望它对你也有用。欲了解更多信息，你可以看到演示

https://github.com/jessesquires/JSQMessagesViewController