问题描述
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
}
}
解决方法
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