如何在 swift 4. 中的 uipickerview 中删除和添加项目？

Question

I have three text fields for which I am showing the same pickerview as drop down for choosing the values. So the condition is that I have 5 values in an array with values red, blue, green, yellow, black. So the condition is

1. These three text fields cannot have same value. That is if for first textfield 1 if I choose red as value from picker the value " red " should be removed or disabled from picker view when I select textfield 2 or text field 3 .

2. And if I change the value of textfield 1 from red to black from picker view the value red which is disabled or removed should get added back to the pickerview when I click on textfield 2 or textfield 3.

The code which I am trying is:

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($0) }
        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($0) }
        return tempArr[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let tempArr = colorsArray.filter { ![textFiled1.text!,textFiled2.text!,textFiled3.text!].contains($0) }
        self.selectedTextField?.text = tempArr[row]
        pickerView.reloadAllComponents()
    }
    func textFieldDidBeginEditing(_ textField: UITextField) {
        self.selectedTextField = textField
        pickerView.reloadAllComponents() 
    }
}