ios - 你如何让发件人显示名称出现在 JSQMessageViewController 中？

Question

我有以下函数被调用以添加消息：

    func addMessage(text: String, displayName: String) {
        let message = JSQMessage(senderId: "tester", displayName: displayName, text: text)
        messages.append(message)

        finishReceivingMessage()

}

然后在这个函数中

    override func collectionView(collectionView: JSQMessagesCollectionView!,
    messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
        return messages[indexPath.item]
}

我返回该 indexPath 的消息日期。消息正确显示，但没有显示名称。

Answer 1

我认为你错过了attributedTextForMessageBubbleTopLabelAtIndexPath应该看起来像这样

 override func collectionView(collectionView: JSQMessagesCollectionView?, attributedTextForMessageBubbleTopLabelAtIndexPath indexPath: NSIndexPath!) -> NSAttributedString! {
    let message = messages[indexPath.item]
    switch message.senderId {
    case CURRENTUSERID:
        return nil
    default:
        guard let senderDisplayName = message.senderDisplayName else {
            assertionFailure()
            return nil
        }
        return NSAttributedString(string: senderDisplayName)

    }
}

编辑：

还要确保使用此功能为标签提供高度

override func collectionView(collectionView: JSQMessagesCollectionView!, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout!, heightForMessageBubbleTopLabelAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
   return 13 //or what ever height you want to give
}    

祝你好运

Answer 2

新的更新方法

override func collectionView(_ collectionView: JSQMessagesCollectionView!, attributedTextForMessageBubbleTopLabelAt indexPath: IndexPath!) -> NSAttributedString!
     {
        let message = messages[indexPath.item]

        if message.senderId == senderId {
            return nil
        } else {
            guard let senderDisplayName = message.senderDisplayName else {
                assertionFailure()
                return nil
            }
            return NSAttributedString(string: senderDisplayName)

        }

    }

     override func collectionView(_ collectionView: JSQMessagesCollectionView!, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout!, heightForMessageBubbleTopLabelAt indexPath: IndexPath!) -> CGFloat
    {
        //return 17.0
        let message = messages[indexPath.item]

        if message.senderId == senderId {
            return 0.0
        } else {

            return 17.0

        }
    }

Answer 3

确保添加此函数以显示名称：

 override func collectionView(collectionView: JSQMessagesCollectionView!, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout!, heightForMessageBubbleTopLabelAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
    return 15
}

Answer 4

这是swift 3的代码

override func collectionView(_ collectionView: JSQMessagesCollectionView!, attributedTextForMessageBubbleTopLabelAt indexPath: IndexPath!) -> NSAttributedString! {
        return  NSAttributedString(string: senderDisplayName)
    }

     override  func collectionView(_ collectionView: JSQMessagesCollectionView!, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout!, heightForMessageBubbleTopLabelAt indexPath: IndexPath!) -> CGFloat {
        return 15 //your height
    }