Question

我对医院ViewPicker有疑问。当用户点击文本字段hospitalName从viewPicker中选择医院名称时，项目显示字符“？”而不是项目名称我附加了图像注意我对位置文本字段使用相同的逻辑

  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

您还没有设置pickerHospital委托。复制self.pickerHospital.dataSource = self两次。你应该写道：

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

Picker View是显示字符“？”而不是项目名称？

1 个答案: