Picker View ist Show Charakter "?" anstelle von Artikelname?

Question

Ich habe ein Problem mit Krankenhaus ViewPicker. Wenn der Benutzer auf das Textfeld Krankenhausname klickt, um den Namen des Krankenhauses aus viewPicker auszuwählen, lautet das Element show character "?" anstelle von Artikelnamen habe ich Bild Hinweis Ich benutze dieselbe Logik für Standort Textfeld

class VisitsViewController: UIViewController,UIPickerViewDataSource,UIPickerViewDelegate,UITextFieldDelegate, UIViewControllerTransitioningDelegate { 

     //MARK - 
     override func viewDidLoad() { 
      super.viewDidLoad() 
      self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(BrnViewController.dismissKeybored)))  
      self.pickerLocation.dataSource = self 
      self.pickerLocation.delegate = self 
      self.pickerLocation.tag = 1 
      self.pickerHospital.dataSource = self 
      self.pickerHospital.dataSource = self 
      self.pickerHospital.tag = 2 

      visitLocationTextField.inputView = pickerLocation 
      self.visitLocationTextField.delegate = self   
      hospitalNameTextField.inputView = pickerHospital 
      self.hospitalNameTextField.delegate = self 
     } 

      override func didReceiveMemoryWarning() { 
      super.didReceiveMemoryWarning() 
      // Dispose of any resources that can be recreated. 
     } 

     // MARK: - Picker View 
     func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 
      return 1 
     } 

     func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
      if pickerView.tag == 1 { 
       return pickerDataVisitLocation.count 
      } 
      else{ 
       return pickerDataHospitalName.count 
      } 
     } 

     func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int){ 
      if pickerView.tag == 1{ 
       visitLocationTextField.text = pickerDataVisitLocation[row] 
      } 
      else{ 
       HospitalNameTextField.text = pickerDataHospitalName[row] 
      } 
     } 

     func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int)-> String? { 
      if pickerView.tag == 1{ 
      return pickerDataVisitLocation[row] 
      } 
      else{ 
       return pickerDataHospitalName[row] 
      } 
     } 
      //MARK: - @IBOutlet 
     @IBOutlet weak var visitLocationTextField: UITextField! 
     @IBOutlet weak var hospitalNameTextField: UITextField! 

      //MARK: - variables 
     var pickerDataVisitLocation = [" ","Home","Hospital","Other"] 
     var pickerDataHospitalName = [" ","test1","test2","test3"] 
     var pickerLocation = UIPickerView() 
     var pickerHospital = UIPickerView() 
    } 

Answer 1

Sie haben anhängen nicht pickerHospital Delegierten festgelegt. Repliziert self.pickerHospital.dataSource = self zweimal. Sie sollten geschrieben haben:

self.pickerHospital.dataSource = self 
self.pickerHospital.delegate = self