可编辑的文本字段-在视图控制器之间使用导航控制器向后传递数据

如何解决可编辑的文本字段-在视图控制器之间使用导航控制器向后传递数据

我正在制作一个应用程序，希望用户能够创建一个新的“行走套”（基本上是闪存卡套），然后返回到打开屏幕，并能够点击他们的任何套，将他们带到可以对其进行编辑的屏幕。

问题是我不知道如何将术语编辑保存在AKA传递数据中，这些数据从编辑VC返回到打开的VC。常规的准备工作不起作用，因为每次我尝试从编辑VC到打开的VC进行选择时，都会由于导航控制器而使整个事情搞砸了。因此，我想我仍然想仅使用“ self.navigationController？.popToRootViewController（animated：true）”进行过渡，并且仍然传递数据。

来自OpeningScreenViewController的代码（显示行走列表的初始屏幕）：

class OpeningScreenViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UITextViewDelegate {  
    
    @IBOutlet var table: UITableView!
    @IBOutlet var label: UILabel!

    var models: [(name: String,term1: String,term2: String,term3: String)] = []

    override func viewDidLoad() {
        super.viewDidLoad()
        table.delegate = self
        table.dataSource = self
        title = "Walks"  
    }
    
    @IBAction func didTapNewWalk(){
        guard let vc = storyboard?.instantiateViewController(identifier: "new") as? NewWalkViewController else {
            return
        }
        vc.title = "New Walk"
        vc.completion = { theName,theTerm1,theTerm2,theTerm3 in
            self.models.append((name: theName,term1: theTerm1,term2: theTerm2,term3: theTerm3))
            self.label.isHidden = true
            self.table.isHidden = false
            
            self.table.reloadData()
        }
        navigationController?.pushViewController(vc,animated: true)
    }
    
    //Table stuff
    
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int{
        return models.count
    }
    
    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell{
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell",for: indexPath)
        cell.textLabel?.text = models[indexPath.row].name
        cell.detailTextLabel?.text = models[indexPath.row].term1
        return cell
    }
    
    func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath,animated: true)
        
        var model = models[indexPath.row]
  
        //show walk controller
        
        guard let vc = storyboard?.instantiateViewController(identifier: "edit") as? EditExistingWalkController else {
                return
        }
        
        //passes data to EditExistingWalkController for the first time
        vc.title = "Edit Walk"
        vc.addTapCountAgain = model.addCount
        vc.nameAgain = model.name
        vc.term1TextAgain = model.term1
        vc.term2TextAgain = model.term2
        vc.term3TextAgain = model.term3
        
        navigationController?.pushViewController(vc,animated: true)
    }
}

来自NewWalkViewController的代码（用户点击OpeningScreenViewController中的“ +”按钮时的屏幕）：

class NewWalkViewController: UIViewController {

    //saves term data
    public var completion: ((String,String,String) -> Void)?

    @IBOutlet weak var nameOfWalkSet: UITextField!
    @IBOutlet weak var term1TxtField: UITextField!
    @IBOutlet weak var term2TxtField: UITextField!
    @IBOutlet weak var term3TxtField: UITextField!
    
    @IBAction func saveButn(_ sender: Any) {
        if let text = term1TxtField.text,!text.isEmpty,let text2 = nameOfWalkSet.text,!text2.isEmpty {
        completion?(text2,text,term2TxtField.text ?? "",term3TxtField.text ?? "")
        
            //goes back to opening screen
            self.navigationController?.popToRootViewController(animated: true)
        }
    }
    override func viewDidLoad() {
        super.viewDidLoad()  
    }
}
extension NewWalkViewController : UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}

EditExistingWalkController中的代码（用户进行步行设置并点击OpeningScreenViewController中表格中的单元格后的屏幕）：

class EditExistingWalkController: UIViewController,UITextViewDelegate {
        
    //these are the text fields that I'm ultimately trying to save and pass the strings that the entered in them
    @IBOutlet weak var nameOfWalkSetEdit: UITextField!
    @IBOutlet weak var term1TxtFieldEdit: UITextField!
    @IBOutlet weak var term2TxtFieldEdit: UITextField!
    @IBOutlet weak var term3TxtFieldEdit: UITextField!
    
    //setting it up so that receives data from model thing in Opening Screen VC
    public var addTapCountAgain: Int = 1
    public var nameAgain: String = "" 
    public var term1TextAgain: String = ""
    public var term2TextAgain: String = ""
    public var term3TextAgain: String = ""
    
    @IBAction func saveButnEdit(_ sender: Any) {
        if let text = term1TxtFieldEdit?.text,let text2 = nameOfWalkSetEdit?.text,!text2.isEmpty {

            //THIS IS WHERE I WANT TO PASS DATA BEFORE SWITCHING VCs

            self.navigationController?.popToRootViewController(animated: true)
         }
        
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        
        //loads text from Opening to go in the textfield boxes in the EditExistingWalk screen
        nameOfWalkSetEdit?.text = nameAgain
        term1TxtFieldEdit?.text = term1TextAgain
        term2TxtFieldEdit?.text = term2TextAgain
        term3TxtFieldEdit?.text = term3TextAgain 
    }
}

Storyboard screenshot