我试着让项目尽可能简单，因为我想我忘记了一些东西，但我不知道是什么，我挣扎了2个小时...
正如您在屏幕上看到的：视图是载入的，除了这消息.请在这里找到我的代码：

import UIKit
import MessageKit

struct Sender: SenderType {
    var senderId: String
    var displayName: String
}

struct Message: MessageType {
    var sender: MessageKit.SenderType
    var messageId: String
    var sentDate: Date
    var kind: MessageKit.MessageKind
}

class ViewController: MessagesViewController {

    var messages = [Message]()
    let currentUser = Sender(senderId: "myId", displayName: "Mark")
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        messagesCollectionView.messagesDataSource = self
        messagesCollectionView.messagesLayoutDelegate = self
        messagesCollectionView.messagesDisplayDelegate = self
        
        messages.append(Message(sender: currentUser, messageId: "123", sentDate: Date().addingTimeInterval(-86400) , kind: .text("Hey Vivaan, You are going to influence")))
                messages.append(Message(sender: currentUser, messageId: "143", sentDate: Date().addingTimeInterval(-86405) , kind: .text("Hey Vivaan, You are going to influence")))
                messages.append(Message(sender: currentUser, messageId: "153", sentDate: Date().addingTimeInterval(-86404) , kind: .text("Hey Vivaan, You are going to influence")))
                messages.append(Message(sender: currentUser, messageId: "163", sentDate: Date().addingTimeInterval(-86403) , kind: .text("Hey Vivaan, You are going to influence")))
    }

}


extension ViewController: MessagesDataSource {
    
    var currentSender: MessageKit.SenderType {
        return currentUser
    }
    
    func messageForItem(at indexPath: IndexPath, in messagesCollectionView: MessagesCollectionView) -> MessageType {
        return messages[indexPath.section]
    }
    
    func numberOfSections(in messagesCollectionView: MessagesCollectionView) -> Int {
        return messages.count
    }
    
    
}

extension ViewController: MessagesDisplayDelegate, MessagesLayoutDelegate { }

我确实读了所有的文档，并看了一些例子。对我来说似乎还可以。
谢谢你的帮忙
app picture