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我已经在其中构建了自定义单元格，Interface Builder并且正在尝试将其沿其他MessageKit单元格（主要是简单的文本单元格）显示。

然后我计算了它的大小：

open class CustomMessagesFlowLayout: MessagesCollectionViewFlowLayout {
    
    open lazy var customMessageSizeCalculator = CustomMessageSizeCalculator(layout: self)
    
    open override func cellSizeCalculatorForItem(at indexPath: IndexPath) -> CellSizeCalculator {
        if isSectionReservedForTypingIndicator(indexPath.section) {
            return typingIndicatorSizeCalculator
        }
        let message = messagesDataSource.messageForItem(at: indexPath, in: messagesCollectionView)
        if case .custom = message.kind {
            return customMessageSizeCalculator
        }
        return super.cellSizeCalculatorForItem(at: indexPath)
    }
    
    open override func messageSizeCalculators() -> [MessageSizeCalculator] {
        var superCalculators = super.messageSizeCalculators()
        // Append any of your custom `MessageSizeCalculator` if you wish for the convenience
        // functions to work such as `setMessageIncoming...` or `setMessageOutgoing...`
        superCalculators.append(customMessageSizeCalculator)
        return superCalculators
    }
}

open class CustomMessageSizeCalculator: MessageSizeCalculator {
    
    public override init(layout: MessagesCollectionViewFlowLayout? = nil) {
        super.init()
        self.layout = layout
    }
    
    open override func sizeForItem(at indexPath: IndexPath) -> CGSize {
        guard let layout = layout else { return .zero }
        let collectionViewWidth = layout.collectionView?.bounds.width ?? 0
        let contentInset = layout.collectionView?.contentInset ?? .zero
        let inset = layout.sectionInset.left + layout.sectionInset.right + contentInset.left + contentInset.right
        return CGSize(width: collectionViewWidth - inset, height: 312)
    }
}

所以它现在有固定的高度，但这很好。它显示得非常好，就像我希望它看起来一样，但它似乎以某种方式破坏了传入的消息头像及其底部标签。我在 3D 视图和头像视图中检查了这一点，只是丢失了。此外，如果我不使用 .Custom 类型的消息（从 nib 加载），传入消息的头像会完美显示。

我像这样初始化布局（viewDidLoad（））：

messagesCollectionView = MessagesCollectionView(frame: .zero, collectionViewLayout: CustomMessagesFlowLayout())
        
        messagesCollectionView.register(UINib(nibName: Constants.Chat.kCustomCellID, bundle: .main), forCellWithReuseIdentifier: Constants.Chat.kCustomCellID)

我像这样设置集合视图：

func configureMessageCollectionView() {
       
        
        let layout = messagesCollectionView.collectionViewLayout as? MessagesCollectionViewFlowLayout
        layout?.sectionInset = UIEdgeInsets(top: 1, left: 8, bottom: 1, right: 8)
        
        // Hide the outgoing avatar and adjust the label alignment to line up with the messages
        layout?.setMessageOutgoingAvatarSize(.zero)
        layout?.setMessageOutgoingMessageTopLabelAlignment(LabelAlignment(textAlignment: .right, textInsets: UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 8)))
        layout?.setMessageOutgoingMessageBottomLabelAlignment(LabelAlignment(textAlignment: .right, textInsets: UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 8)))

        // Set outgoing avatar to overlap with the message bubble
        layout?.setMessageIncomingMessageTopLabelAlignment(LabelAlignment(textAlignment: .left, textInsets: UIEdgeInsets(top: 0, left: 18, bottom: outgoingAvatarOverlap, right: 0)))
        layout?.setMessageIncomingAvatarSize(CGSize(width: 30, height: 30))
        layout?.setMessageIncomingMessagePadding(UIEdgeInsets(top: -outgoingAvatarOverlap, left: -18, bottom: outgoingAvatarOverlap, right: 18))
        
        layout?.setMessageIncomingAccessoryViewSize(CGSize(width: 30, height: 30))
        layout?.setMessageIncomingAccessoryViewPadding(HorizontalEdgeInsets(left: 8, right: 0))
        layout?.setMessageIncomingAccessoryViewPosition(.messageBottom)
        layout?.setMessageOutgoingAccessoryViewSize(CGSize(width: 30, height: 30))
        layout?.setMessageOutgoingAccessoryViewPadding(HorizontalEdgeInsets(left: 0, right: 8))

        messagesCollectionView.messagesLayoutDelegate = self
        messagesCollectionView.messagesDisplayDelegate = self
    }
}

我有消息数据源：

lazy var messageList: [ChatMessage] = []

所以它的设置与 github 上的 MessageKit 示例应用程序非常相似。

我不确定我是否在这里遗漏了一些重要的东西，或者我以某种错误的方式使用了自定义尺寸计算器，这反过来又破坏了 UI/其他默认计算器的功能？

有什么提示吗？

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