Question

我处理以下问题：在主VC上我有一个TableView，在容器视图控制器上我有一个textField。我想添加每个文本，我在容器中输入自动显示为主VC中tableView的新行

到目前为止，我使用segue将数据从主VC发送到容器。但是我应该以相反的顺序执行相同的操作呢？我虽然在容器视图中实现了主VC的委托，但我不知道如何正确地做到这一点。或者可能存在更常见的解决方案。

无论如何，这是我的代码：

class MessageViewController: UIViewController {

    var currentUser: User!

    var containerViewController: InputTextViewController?

    @IBOutlet weak var enterMessageView: UIView!
    @IBOutlet weak var messageTableView: UITableView!
}

extension MessageViewController {

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "moveToInputText" {
            let connectContainerViewController = segue.destination as? InputTextViewController
            containerViewController = connectContainerViewController

            containerViewController?.userSendMessageTo = currentUser

        }
    }
}

extension MessageViewController: UITableViewDelegate, UITableViewDataSource {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return currentUser.mesaageHistory.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "messageCell") as! ChatMessageTableViewCell
        let data = currentUser.mesaageHistory[indexPath.row]
        cell.messageLabel.text = data.messageText

        return cell
    }
}

class InputTextViewController: UIViewController {

    @IBOutlet weak var messageTextField: UITextField!

    var userSendMessageTo: User!

    weak var delegate = MessageViewController()

    @IBAction func sendMessge(_ sender: Any) {

        handleSend()
        userSendMessageTo.mesaageHistory.append(message)

        print(userSendMessageTo.mesaageHistory[0].messageText)

        let row = userSendMessageTo.mesaageHistory.count - 1
        let insertIndexPath = IndexPath(item: row, section: 0)

        print(userSendMessageTo.mesaageHistory.count)

        delegate?.messageTableView.beginUpdates()
        delegate?.messageTableView.insertRows(at: [insertIndexPath], with: UITableViewRowAnimation.automatic)
        delegate?.messageTableView.endUpdates()

    }

}

Answer 1

以下是如何使用＆＃39;委托＆＃39;模式正确

协议声明＆amp;代表成员

protocol InputTextViewControllerDelegate: class {
   func someFunc()

   func anotherFunc()
}


class InputTextViewController: UIViewController {

 weak var delegate: InputTextViewControllerDelegate?
}

协议实施＆amp;设置委托属性

extension MessageViewController, InputTextViewControllerDelegate {

 // MARK: InputTextViewControllerDelegate
 //

 func someFunc()
 {

 }


 func anotherFunc()
 {

 }


 override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "moveToInputText" {
    let connectContainerViewController = segue.destination as? InputTextViewController
    containerViewController = connectContainerViewController

    containerViewController

   }
  }
}

如何正确地在容器视图和主视图控制器之间传递数据

1 个答案: