动态UIPickerView菜单

Question

我正在尝试创建一个使用2个文本字段和1个选取器视图的应用程序。一旦用户点击第一个文本字段，应该弹出选择器。在用户从菜单中进行选择并点击第二个文本字段后，选择器会再次弹出，但菜单依赖于第一个文本字段中的文本（上一个选择）。

我遇到的问题是，当第二个字段被点击时（第一个选择被创建并显示在第一个文本标记中），选择器出现时，菜单不显示第二个选择阶段。

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，点击了几次，然后通过选择器滚动并进行选择后，菜单保持不变（仍显示“信”和“号码”），但实际选择的值是“正确的”。请帮我做这个工作。提前致谢。

Answer 1

在函数textFieldDidBeginEditing中，在调用picker.hidden = false之前，重新加载pickerview。