在Swift 3中創建一個下拉列表

我試圖在下拉列表中選擇器視圖在用戶單擊文本框之前不可見。然後，選擇器視圖在用戶從pickerView中進行選擇後消失。目前，當我點擊文本框時，選擇器視圖根本不顯示。在Swift 3中創建一個下拉列表

import UIKit 

class ViewController: UIViewController, UIPickerViewDataSource,  UIPickerViewDelegate { 
    @IBOutlet weak var textBox: UITextField! 
    @IBOutlet weak var pickerView: UIPickerView! 

    var choices = ["SortBy:", "Date(ascending)", "Date(descending)","Calories Burned(descending)","Duration(descending)"] 

    func numberOfComponents(in pickerView: UIPickerView) -> Int { 
     return 1 
    } 

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { 
     self.view.endEditing(true) 
     return choices[row] 
    } 

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { 
     return choices.count 
    } 

    fun pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { 
     self.textBox.text = self.choices[row] 
     self.pickerView.isHidden = true 

     print("hello") 
    } 

    func textFieldDidBeginEditing(TextField: UITextField){ 
     if TextField == self.textBox { 
      self.pickerView.isHidden = false 
      TextField.endEditing(true) 
     } 
    } 

    override func viewDidLoad() { 
     self.pickerView.isHidden = true 
     super.viewDidLoad() 
    } 
}

來源

2017-07-18 jean

不是一個直接的答案，但你可能想看看https://github.com/skywinder/ActionSheetPicker-3.0 - 我只是一個定製他們的採摘員要做你正在做的事情。 – sschale

謝謝我會檢查出來。 – jean

試試這個：

override func viewDidLoad() { 
     self.pickerView.isHidden = true 
     super.viewDidLoad() 
     self.textBox.delegate = self 
     self.pickerView.delegate = self 
    }

來源

2017-07-19 09:26:34

在Swift 3中創建一個下拉列表

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