如何从具有多个组件的 pickView 中获取确切的值

Question

我有一个 PickerView 和一个像这样的标签：

我想，当我更改组件中每一行的值时，它会将值分配给上面的标签。

例如：当我在第一个组件中选择 "Blue" 并在第二个组件中选择 "Two" 时，它会将 "Blue Two" 分配给标签。

我试过这样，但效果不佳，当我 select 第二个组件中的第六个值时它会崩溃:

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet var colorLabel: UILabel!
    let colors = ["Red", "Green", "Blue", "Black", "White"]
    let numbers = ["One", "Two", "Three", "Four" ,"Five", "Six", "Seven"]
    var array = [[String]]()

    override func viewDidLoad() {
        super.viewDidLoad()
        array = [colors, numbers]
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return array.count
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return array[component].count
    }

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

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        colorLabel.text = component == 0 ? array[component][row] + " " + array[component][row] : array[component][row] + " " + array[component][row]
    }

}

Answer 1

我在 ViewController

的顶部添加了这些行

var colorString = ""
var numberString = ""

并像这样更改 didSelectRow 函数：

 func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if component == 0 {
            colorString = array[component][row]
        } else {
            numberString = array[component][row]
        }
        resultLabel.text = colorString + " " + numberString
    }

现在运行良好。

Answer 2

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    var selectedValueFirstRow = pickerView.selectedRowInComponent(0)
    var selectedValueSecondRow = pickerView.selectedRowInComponent(1)

    colorLabel.text = colors[selectedValueFirstRow] + " " + numbers[selectedValueSecondRow]
}

您的代码正在崩溃，因为它超出了第一个数组的索引

如何从具有多个组件的 pickView 中获取确切的值

How to get the exact value from pickView with multiple component

uipickerview

ios

swift