swift - 如何在选择器中快速获取所选项目的标题和项目的价值？

Question

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，我怎样才能获得所选项目详细信息的名称，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。

Answer 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])")
    }

Answer 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)
}

Answer 3

你可以通过

@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