anther UIViewController가 해제되었을 때 UIViewControler에서 UILabel.text를 변경하는 방법

Question

신속한 xcode 8.1로 간단한 응용 프로그램을 만들었습니다. 응용 프로그램에서 viewcotroller가 닫힐 때 함수를 적용하고 이전 viewcontroller의 UILabel.text가 변경되었습니다. 하지만 항상 동일합니다. 어떻게해야합니까? 내 앱이 내 계획과 어떻게 작동하는지 알아야합니다. 당신에게

import UIKit 
import RealmSwift 

protocol SetButtonUnitDelegate: class{ 
    func setUnit(numButton: Int,id: Int) 
} 

var inCategory = Int() 
var inUnit = Int() 

class ConvertViewController: UIViewController { 
    static var unitData = DBManager.realm.objects(UnitModel.self).filter("catId == \(inCategory)").sorted(byKeyPath: "sortOrder", ascending: true) 
    static var idUnit: Int = 0 
    @IBOutlet weak var unit1Button: UIButton! 
    @IBOutlet weak var unitDsc1Lbl: UILabel! 
    @IBOutlet weak var unit2Button: UIButton! 
    @IBOutlet weak var padCollectionView: UICollectionView! 
    @IBOutlet weak var inputNumberLbl: UILabel! 
    @IBOutlet weak var unitDsc2Lbl: UILabel! 
    let unitId = 1 
    override func viewDidLoad() { 
     super.viewDidLoad() 
     self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white] 
     setKeypad() 
     setDefaultUnit() 

    } 
    //MARK: - Layout 
    func setKeypad() { 
     let weidth = padCollectionView.frame.width 
     let layout = UICollectionViewFlowLayout() 
     layout.scrollDirection = .vertical 
     let marginRL: CGFloat = 10 
      let minspacing: CGFloat = 1.0 
      let cellWeidth: CGFloat = (weidth/4.0) - (minspacing + marginRL) 
      let cellSIze = CGSize(width: cellWeidth, height: cellWeidth) 
      layout.itemSize = cellSIze 
      layout.minimumLineSpacing = minspacing 
      layout.minimumInteritemSpacing = 1.0 
      layout.sectionInset = UIEdgeInsets(top: marginRL, left: marginRL, bottom: 1.0, right: marginRL) 
      padCollectionView.setCollectionViewLayout(layout, animated: true) 
      padCollectionView.reloadData() 
    } 

    func setDefaultUnit() { 
     if inButton != 0 && inButton == 1 { 
      print("buton pertama") 
     }else if inButton != 0 && inButton == 2 { 
      print("button ke dua") 
     }else { 
     unit1Button.setTitle(ConvertViewController.unitData[0].symbol, for: .normal) 
     unitDsc1Lbl.text = ConvertViewController.unitData[0].unitName 
     unit2Button.setTitle(ConvertViewController.unitData[1].symbol, for: .normal) 
     unitDsc2Lbl.text = ConvertViewController.unitData[1].unitName 
      print("buton awal") 
     } 
    } 

    //MARK: - ACtion 
    @IBAction func unit1Touch(_ sender: UIButton) { 
     showSubCat() 
     inButton = 1 
    } 

    @IBAction func unit2Touch(_ sender: UIButton) { 
     showSubCat() 
     inButton = 2 
    } 
    func showSubCat() { 
     let SVC = self.storyboard?.instantiateViewController(withIdentifier: "subCategoryTVC") as! SubCategoryTVC 
     let navigation = UINavigationController(rootViewController: SVC) 
     SVC.title = self.title 
     self.present(navigation, animated: true, completion: nil) 
    } 
    @IBAction func keypadOnTamped(_ sender: KeypadUIButton) { 
     let num: Int = (sender.indexpath?.row)! 
     let curent = inputNumberLbl.text! 
     switch num { 
     case 0: 
      if curent == "0" { 
       inputNumberLbl.text = "7" 
      }else{ 
       inputNumberLbl.text = "\(curent)7" 
      } 
      break 
     case 1: 
      if curent == "0" { 
       inputNumberLbl.text = "8" 
      }else{ 
       inputNumberLbl.text = "\(curent)8" 
      } 
      break 
     case 2: 
      if curent == "0" { 
       inputNumberLbl.text = "9" 
      }else{ 
       inputNumberLbl.text = "\(curent)9" 
      } 
      break 
     case 3: 
      inputNumberLbl.text = "0" 
      break 
     case 4: 
      if curent == "0" { 
      inputNumberLbl.text = "4" 
      }else{ 
      inputNumberLbl.text = "\(curent)4" 
      } 
     case 5: 
      if curent == "0" { 
       inputNumberLbl.text = "5" 
      }else{ 
       inputNumberLbl.text = "\(curent)5" 
      } 
      break 
     case 6: 
      if curent == "0" { 
       inputNumberLbl.text = "6" 
      }else{ 
       inputNumberLbl.text = "\(curent)6" 
      } 
      break 
     case 7: 
      if curent != "0" && (curent as NSString).length > 1{ 
       var aString: String? = curent 
       aString = (aString! as NSString).substring(to: (aString! as NSString).length - 1) 
       inputNumberLbl.text = aString 
      }else if curent != "0" && (curent as NSString).length > 0 { 
       inputNumberLbl.text = "0" 
      } 
      break 
     case 8: 
      if curent == "0" { 
       inputNumberLbl.text = "1" 
      }else{ 
       inputNumberLbl.text = "\(curent)1" 
      } 
      break 
     case 9: 
      if curent == "0" { 
       inputNumberLbl.text = "2" 
      }else{ 
       inputNumberLbl.text = "\(curent)2" 
      } 
      break 
     case 10: 
      if curent == "0" { 
       inputNumberLbl.text = "3" 
      }else{ 
       inputNumberLbl.text = "\(curent)3" 
      } 
      break 
     case 11: 
      print("roal back") 
      break 
     case 12: 
      if curent.contains(".") == false { 
       inputNumberLbl.text = "\(curent)." 
      } 
      break 
     case 13: 
      if curent != "0" { 
       inputNumberLbl.text = "\(curent)0" 
      } 
      break 
     case 14: 
      if curent.contains("-") { 
       inputNumberLbl.text = curent.replacingOccurrences(of: "-", with: "") 
       print("dot seted") 
      }else{ 
       inputNumberLbl.text = "-\(curent)" 
      } 
      break 
     case 15: 
      print("show setting") 
      break 
     default: 
      print(num + 1) 
     } 
    } 
} 
//MARK: - UIColletionViewDataSourece 
private let identifier = "converterCollectionViewCell" 
extension ConvertViewController: UICollectionViewDataSource { 
    func numberOfSections(in collectionView: UICollectionView) -> Int { 
     return 1 
    } 
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
     return 16 
    } 
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 
     let cell = padCollectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath) as! ConverterCollectionViewCell 
     let index = indexPath.row 
     cell.keypadButton.indexpath = indexPath as NSIndexPath 
     cell.keypadButton.addTarget(self, action: #selector(keypadOnTamped(_:)), for: .touchUpInside) 
     let keypad = cell.keypadButton! 
     switch index { 
     case 0: 
      keypad.setTitle("7", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 1: 
      keypad.setTitle("8", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 2: 
      keypad.setTitle("9", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 3: 
      keypad.setTitle("C", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 4: 
      keypad.setTitle("4", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 5: 
      keypad.setTitle("5", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 6: 
      keypad.setTitle("6", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 7: 
      keypad.setTitle(nil, for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "btn_back"), for: .normal) 
      break 
     case 8: 
      keypad.setTitle("1", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 9: 
      keypad.setTitle("2", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 10: 
      keypad.setTitle("3", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 11: 
      keypad.setTitle(nil, for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "btn_swap"), for: .normal) 
      break 
     case 12: 
      keypad.setTitle(".", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 13: 
      keypad.setTitle("0", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 14: 
      keypad.setTitle("+/-", for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "bg_keypad"), for: .normal) 
      break 
     case 15: 
      keypad.setTitle(nil, for: .normal) 
      keypad.setBackgroundImage(UIImage(named: "btn_setting"), for: .normal) 
     default: 
      print("some ting error") 
     } 
     return cell 
    } 
} 

extension ConvertViewController: SetButtonUnitDelegate{ 
    func setUnit(numButton: Int,id: Int) { 
     let data = DBManager.realm.objects(UnitModel.self).filter("id == \(id)").first! 
     if numButton == 1 { 
      unit1Button.setTitle(data.symbol, for: .normal) 
      unitDsc1Lbl.text = data.unitName 
     }else if numButton == 2 { 
      unit2Button.setTitle(data.symbol, for: .normal) 
      unitDsc2Lbl.text = data.unitName 
     }else{ 
      print("noting for todo") 
     } 

    } 
} 

을 감사하고 Delegate를 사용하여 해산 할 때 UIViewController 두 번째의 ViewController

mport UIKit 

var inButton = Int() 

class SubCategoryTVC: UITableViewController { 
    let subCat = DBManager.realm.objects(SubCategoryModel.self).filter("catId == \(inCategory)").sorted(byKeyPath: "sortOrder", ascending: true) 
    weak var delegate : SetButtonUnitDelegate? 
    let vc = ConvertViewController() 
    override func viewDidLoad() { 
     super.viewDidLoad() 

    } 
    // MARK: - Table view data source 
    override func numberOfSections(in tableView: UITableView) -> Int { 
     return subCat.count 
    } 

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return subCat[section].haveUnit.count 
    } 


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
     let cell: SubCategoryCell = tableView.dequeueReusableCell(withIdentifier: "subCategoryCell", for: indexPath) as! SubCategoryCell 
     let unit = subCat[indexPath.section].haveUnit[indexPath.row] 
     cell.symbolLabel.text = SubCategoryTVC.getSymbol(unitId: unit.id) 
     cell.titleSymLabel.text = unit.unitName 
     cell.dscLabel.text = unit.unitName 
     return cell 
    } 
    override func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? { 
     let header = tableView.dequeueReusableHeaderFooterView(withIdentifier: "header") as? HeaderCell ?? HeaderCell(reuseIdentifier: "header") 
     let catTitle = HomeCVController.getCategori[inCategory].catName 
     let titleOfCat = "cat \(catTitle)" 
     let catImage = titleOfCat.lowercased() 
     let imageOfCat = catImage.replacingOccurrences(of: " ", with: "_") 
     header.iconImage.image = UIImage(named: imageOfCat) 
     header.titleLabel.text = subCat[section].subCatName 
     header.section = section 
     return header 
    } 
    override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat { 
     return 70.0 
    } 
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 
     let idUnit = subCat[indexPath.section].haveUnit[indexPath.row].id 
     self.delegate?.setUnit(numButton: 1, id: idUnit) 
     inUnit = idUnit 
     self.dismiss(animated: true, completion: nil) 
     showConverter() 
    } 
    func showConverter() { 
     let SVC = self.storyboard?.instantiateViewController(withIdentifier: "convertViewController") as! ConvertViewController 
     let navigation = UINavigationController(rootViewController: SVC) 
     SVC.title = "some" 
     self.present(navigation, animated: true, completion: nil) 
    } 
    static func getSymbol(unitId: Int)->String{ 
     let inSub = DBManager.realm.objects(UnitModel.self).filter("id == \(unitId)").first! 
     var data: String = "" 
     if inSub.symbol != "" { 
      data = inSub.symbol 
     }else{ 
//   data = inSub.unitName 
      let aString = inSub.unitName 
      do{ 
      let regex = try NSRegularExpression(pattern: "%(.*)%", options: []) 
      let tmp = aString as NSString 
      var results = [String]() 
       regex.enumerateMatches(in: aString, options: [], range: NSMakeRange(0, aString.characters.count), using: { 
       result,flags,stop in 
        if let range = result?.rangeAt(1){ 
         results.append(tmp.substring(with: range)) 
        } 
       }) 
       if results.count == 0 { 
        let first = aString.components(separatedBy: " ") 
        data = first.first! 
       } 
      }catch{ 
       print("some ting error") 
      } 
     } 
     return data 
    } 

} 

Answer 1

에 당신은 UILabel 텍스트를 변경할 수 있습니다. 이 예제 코드를 통해

class SomeClass: UIViewController, ChangeLabelDelegate { 

override func viewDidLoad() { 
     super.viewDidLoad() 

     viewConfiguration() 
     getAllDropDowns() 
    } 

func buttonClick() { 

    let secondViewController : SecondViewController .... 
    secondViewController.delegate = self 
} 

func changeLabel() { 
    // change Label Text here 
} 

} 

protocol ChangeLabelDelegate { 
     func changeLabel() 
    } 
class SecondViewController: UIViewController { 

    weak var delegate: ChangeLabelDelegate? 
override func viewDidLoad() { 
     super.viewDidLoad() 

    } 

func changeLabel() { 

    if (delegate) { 
    delegate.changeLabel 
} 
} 

당신은 UILabel 텍스트를 변경할 수 있습니다.