swift 4. 如何在 uipickerview 中删除和添加项目？

Question

我在三个文本字段中显示了与用于选择值的下拉菜单相同的选择器视图。所以条件是我在一个数组中有 5 个值，值分别为红色、蓝色、绿色、黄色、黑色。所以条件是

这三个文本字段不能有相同的值。也就是说，如果对于第一个文本字段 1，如果我从选择器中选择红色作为值，则当我 select 文本字段 2 或文本字段 3 时，应该从选择器视图中删除或禁用值“红色”。
如果我从选择器视图中将文本字段 1 的值从红色更改为黑色，当我单击文本字段 2 或文本字段 3 时，禁用或删除的红色值应该添加回选择器视图.

我正在尝试的代码是：

import UIKit


class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var textFiled1: UITextField!
    @IBOutlet weak var textFiled2: UITextField!
    @IBOutlet weak var textFiled3: UITextField!
    @IBOutlet weak var pickerView: UIPickerView!

    var Array = ["Blue", "Green", "Red", "White", "Grey"]
    var indexOfPicker = Int()

    override func viewDidLoad() {
        super.viewDidLoad()
        pickerView.dataSource = self
        pickerView.delegate = self
    }

    @IBAction func minusButton(_ sender: UIButton) {
        if Array.count != 0 {
            Array.remove(at: indexOfPicker)
            pickerView.reloadAllComponents()
        }
    }

    @IBAction func plusButton(_ sender: UIButton) {
        if textFiled.text != "" {
            Array.append(textFiled.text!)
            pickerView.reloadAllComponents()
        }
    }

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

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

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return Array[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        indexOfPicker = row
    }    
}

Answer 1

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, UITextFieldDelegate {

    @IBOutlet weak var textFiled1: UITextField!
    @IBOutlet weak var textFiled2: UITextField!
    @IBOutlet weak var textFiled3: UITextField!
    @IBOutlet weak var pickerView: UIPickerView!

    var selectedTextField:UITextField?

    var colorsArray = ["Blue", "Green", "Red", "White", "Grey"]

    override func viewDidLoad() {
        super.viewDidLoad()

        textFiled1.delegate = self
        textFiled2.delegate = self
        textFiled3.delegate = self

        pickerView.dataSource = self
        pickerView.delegate = self
    }

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

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        let tempArr = colorsArray.filter { ![textFiled1.text!,textFiled2.text!,textFiled3.text!].contains([=10=]) }
        return tempArr.count
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        let tempArr = colorsArray.filter { ![textFiled1.text!,textFiled2.text!,textFiled3.text!].contains([=10=]) }
        return tempArr[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let tempArr = colorsArray.filter { ![textFiled1.text!,textFiled2.text!,textFiled3.text!].contains([=10=]) }
        self.selectedTextField?.text = tempArr[row]
        pickerView.reloadAllComponents()
    }
    func textFieldDidBeginEditing(_ textField: UITextField) {
        self.selectedTextField = textField
        pickerView.reloadAllComponents() 
    }
}

swift 4. 如何在 uipickerview 中删除和添加项目？

How to remove and add items in uipickerview in swift 4.?

ios

iphone

xcode

swift4

uipickerview