Question

如何显示默认或自定义导航栏？尝试了一切，但没有任何效果，似乎没有什么是最上端的，它是messagekit的messageViewcontroller，并且找不到导航栏的任何委托方法，如果有人对我有所了解，那就太好了。

我的代码

    override func viewDidLoad() {
    messagesCollectionView = MessagesCollectionView(frame: .zero, collectionViewLayout: CustomMessagesFlowLayout())
    messagesCollectionView.register(CustomCell.self)
    super.viewDidLoad()
    messagesCollectionView.messagesDataSource = self
    messagesCollectionView.messagesLayoutDelegate = self
    messagesCollectionView.messagesDisplayDelegate = self
    messagesCollectionView.messageCellDelegate = self
    messageInputBar.delegate = self
    configureMessageInputBar()
    configureInputBarItems()
    updateTitleView(title: "Hanzala", subtitle: "Online")
}


import UIKit

扩展UIViewController {

func updateTitleView(title: String, subtitle: String?, baseColor: UIColor = .white) {
    
    let titleLabel = UILabel(frame: CGRect(x: 0, y: -2, width: 0, height: 0))
    titleLabel.backgroundColor = UIColor.clear
    titleLabel.textColor = baseColor
    titleLabel.font = UIFont.systemFont(ofSize: 15)
    titleLabel.text = title
    titleLabel.textAlignment = .center
    titleLabel.adjustsFontSizeToFitWidth = true
    titleLabel.sizeToFit()
    
    let subtitleLabel = UILabel(frame: CGRect(x: 0, y: 18, width: 0, height: 0))
    subtitleLabel.textColor = baseColor.withAlphaComponent(0.95)
    subtitleLabel.font = UIFont.systemFont(ofSize: 12)
    subtitleLabel.text = subtitle
    subtitleLabel.textAlignment = .center
    subtitleLabel.adjustsFontSizeToFitWidth = true
    subtitleLabel.sizeToFit()
    
    let titleView = UIView(frame: CGRect(x: 0, y: 0, width: max(titleLabel.frame.size.width, subtitleLabel.frame.size.width), height: 30))
    titleView.addSubview(titleLabel)
    if subtitle != nil {
        titleView.addSubview(subtitleLabel)
    } else {
        titleLabel.frame = titleView.frame
    }
    let widthDiff = subtitleLabel.frame.size.width - titleLabel.frame.size.width
    if widthDiff < 0 {
        let newX = widthDiff / 2
        subtitleLabel.frame.origin.x = abs(newX)
    } else {
        let newX = widthDiff / 2
        titleLabel.frame.origin.x = newX
    }
    
    navigationItem.titleView = titleView
}

}

我想要这样的导航栏

将ChatViewController推入NavigationController

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)
    let model = Api.Params.chatUser[indexPath.row]
    openConversation(model)
}

func openConversation(_ model: ChatUser) {
    Api.Params.inputRecieverId = model.userId
    let id = String(requestManager.instance.userID)
    let vc = ChatViewController(recieverId: model.userId, senderId: id, conversationId: "Eman-Conversation-\(id)-\(model.userId)")
    vc.title = model.username
    vc.navigationItem.largeTitleDisplayMode = .never
    navigationController?.pushViewController(vc, animated: true)
}

Answer 1

您必须将MessageViewcontroller嵌入UINavigationController内并使用它。

let navigationController = UINavigationController(rootViewController: MessageViewcontroller())

如果您要推入MessageViewcontroller的控制器已经有一个navigationController，则将MessageViewcontroller推入导航堆栈而不是显示。

let messageViewcontroller = MessageViewcontroller()
navigationController?.pushViewController(messageViewcontroller, animated: true)

Messagekit导航栏未显示

1 个答案: