動態UIPickerView菜單

Question

我正在嘗試創建一個使用2個文本字段和1個選取器視圖的應用程序。一旦用戶點擊第一個文本字段，應該彈出選擇器。在用戶從菜單中進行選擇並點擊第二個文本字段後，選擇器會再次彈出，但菜單依賴於第一個文本字段中的文本（上一個選擇）。

我遇到的問題是，當第二個字段被點擊時（第一個選擇被創建並顯示在第一個文本標記中），選擇器出現時，菜單不顯示第二個選擇階段。

import UIKit 

    class ViewController: UIViewController, UITextFieldDelegate, UIPickerViewDataSource, UIPickerViewDelegate { 

@IBOutlet var textField1: UITextField! 
@IBOutlet var textField2: UITextField! 

var activeTextField = 0 

@IBOutlet var picker: UIPickerView! 

var characters = ["Letter", "Number"] 
var letters = ["A", "B", "C", "D"] 
var numbers = ["1", "2", "3", "4", "5"] 


override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    picker.hidden = true 
} 

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


func textFieldDidBeginEditing(textField: UITextField) { 

    textField.resignFirstResponder() 

    if (textField == textField1) { 

     activeTextField = 0 

    } 
    else if (textField == textField2) { 

     activeTextField = 1 

    } 

    picker.hidden = false 

} 

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { 

    return 1 

} 


func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 

    if (activeTextField == 0) { 
     return characters.count 

    } 
    else if (textField1.text == "Letter") { 
      return letters.count 
    } 
    else if (textField1.text == "Number") { 
     return numbers.count 

    } 


    return component 
} 

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 

    picker.hidden = true 
    if (activeTextField == 0) { 
     textField1.text = characters[row] 
     picker.reloadAllComponents() 
    } 
    else if (textField1.text == "Letter") { 
      textField2.text = letters[row] 
    } 
    else if (textField1.text == "Number") { 
      textField2.text = numbers[row] 


    } 

} 


func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { 

    if (activeTextField == 0) { 
     return characters[row] 

    } 
    else if (textField1.text == "Letter") { 
      return letters[row] 
     } 
    else if (textField1.text == "Number") { 
     return numbers[row] 

    } 

    return nil 
} 


deinit { 
    self.picker.delegate = nil 
    self.picker.dataSource = nil 
} 
    } 

我也想指出的是，點擊了幾次，然後通過選擇器滾動並進行選擇後，菜單保持不變（仍顯示「信」和「號碼」），但實際選擇的值是「正確的」。請幫我做這個工作。提前致謝。

Answer 1

在函數textFieldDidBeginEditing中，在調用picker.hidden = false之前，重新加載pickerview。