如何在选择器中快速获取所选项目的标题和项目的价值？

Posted 2023-02-24

【中文标题】如何在选择器中快速获取所选项目的标题和项目的价值？

【英文标题】：How can i reach of selected item's title and item's value in picker in swift?

【发布时间】：2018-05-15 11:57:10

【问题描述】：

让我先描述视图控制器（页面设计）方面。我添加了一个选择器视图、一个标签和一个按钮，这是我的 viewController 文件

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource 
    //var myArray2 = [["Alex", "de Souza", "1977"],["Ariel", "Ortega", "1974"],["Lefter", "KucukAndonyadis", "1925"]]
    //structure of myArray2: name, lastname, bday

    var myArray = ["Alex", "de Souza", "1977"]

    var indexValueOfSelectedItem = 0
    var nameValueOfSelectedItem = ""
    var lastnameValueOfSelectedItem = ""
    var bdateOfSelectedItem = 0

    @IBOutlet weak var lblResult: UILabel!
    @IBOutlet weak var pickerStudent: UIPickerView!
    override func viewDidLoad() 
        super.viewDidLoad()
        pickerStudent.delegate = self
        pickerStudent.dataSource = self
    

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

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

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

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
        indexValueOfSelectedItem = row
        //nameValueOfSelectedItem = row
        //lastnameValueOfSelectedItem = row
        //bdateOfSelectedItem = row
    

    @IBAction func buttonClick(_ sender: Any) 
        lblResult.text = String (indexValueOfSelectedItem)
    

如果我使用 myArray2 而不是 myArray，我如何获得所选项目详细信息的名称，例如姓名、姓氏等？我想在标签中显示所选项目的姓名、姓氏和生日。

【参考方案1】：

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 
        return myArray2[row][0]
    

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int 
        return myArray2.count
    

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

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
        indexValueOfSelectedItem = row

        print("name: \(myArray2[indexValueOfSelectedItem][0])")
        print("last name: \(myArray2[indexValueOfSelectedItem][1])")
        print("birthdate: \(myArray2[indexValueOfSelectedItem][2])")
    

【讨论】：

谢谢。但这会在选择器中显示姓名、姓氏、生日。我只想显示名称。但我想使用我在 lblResult 出口定义@Khushbu 之前在全局范围内声明的不同变量达到所选项目的姓氏、生日、名称和索引

@user3615345 我已根据您的要求编辑了我的答案。

这就是我想要的。赞赏。 @Khushbu

【参考方案2】：

var pickerDataSource = [["Alex", "de Souza", "1977"],["Ariel", "Ortega", "1974"],["Lefter", "KucukAndonyadis", "1925"]]


var selectedModel = ["", "", ""]


@IBOutlet weak var lblResult: UILabel!
@IBOutlet weak var pickerStudent: UIPickerView!
override func viewDidLoad() 
super.viewDidLoad()
pickerStudent.delegate = self
pickerStudent.dataSource = self


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


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


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


func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
    selectedModel = pickerDataSource[row]


@IBAction func buttonClick(_ sender: Any) 
    print(selectedModel)

【讨论】：

titleForRow 给出错误：无法将 '[String]' 的返回表达式转换为返回类型 'String?' @Taimoor Suleman（谢谢）

无法将'[String]'的返回表达式转换为返回类型'String?' @Taimoor Suleman

在标题中尝试这一行返回pickerDataSource[row][0]

现在，它可以工作了。我得到整个选定的行。所以我可以解析它，对吧？因为我的名字、姓氏、生日都是这样的：“Lefter”、“KucukAndonyadis”、“1925”] @Taimoor Suleman

是的，如果您发现它是正确答案，请将其标记为正确答案并点赞。谢谢

【参考方案3】：

你可以通过

获得价值

@IBAction func buttonClick(_ sender: Any) 
lblResult.text =  myArray[pickerStudent.selectedRow(inComponent: 0)] 

为了获得选定的索引，您可以使用

pickerStudent.selectedRow(inComponent: 0)

使用委托方法，您可以在用户滚动选择器视图时获得价值，但是如果用户不滚动并想要选择第一个数据，那么您可以使用此方法并且您也不需要任何委托方法