[英]How to pass data between container view and main view controller properly
I'm dealing with following problem: On main VC I have a TableView, and on container view controller I have a textField. 我正在处理以下问题:在主VC上,我有一个TableView,在容器视图控制器上,我有一个textField。 I want to add every text, I'm typing in container automatically appears as a new row on tableView in main VC
我想添加所有文本,我在容器中输入内容会自动显示为主VC中tableView上的新行
By now I'm using segue to send data from main VC to container. 现在,我正在使用segue将数据从主VC发送到容器。 But what should I implement to do the same in a reverse order?
但是,我应该怎么做才能以相反的顺序执行相同的操作? I though of implementing delegate of main VC in my container view, but I have no idea how to do that properly.
虽然我在容器视图中实现了主要VC的委托,但是我不知道如何正确执行。 Or maybe there is exist more common solution.
或者,也许存在更常见的解决方案。
Anyway, here is my code: 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()
}
}
Here's how to use the 'delegate' pattern properly 这是正确使用“委托”模式的方法
Protocol declaration & delegate member 协议声明和委托成员
protocol InputTextViewControllerDelegate: class { func someFunc() func anotherFunc() } class InputTextViewController: UIViewController { weak var delegate: InputTextViewControllerDelegate? }
Protocol implementation & setting the delegate property 协议实现和设置委托属性
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 } } }
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