[英]How to remove and add items in uipickerview in swift 4.?
我有三个文本字段,我显示与用于选择值的下拉列表相同的选择器视图。 所以条件是我在数组中有 5 个值,其中包含红色、蓝色、绿色、黄色、黑色。 所以条件是
这三个文本字段不能具有相同的值。 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,那么当我选择文本字段 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被添加回选择器视图。
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
}
}
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()
}
}
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