如何從pickView得到確切的數值與多個組件

Question

我有一個PickerView和這樣的標籤：

我想，當我改變每行的組成部分的價值，它會將值分配給上面的標籤。

例如：當我在第一個組件中選擇「Blue」並在第二個組件中選擇「Two」時，它將爲標籤分配「Blue Two」。

我已經試過這樣的，但它不能很好地工作，它會崩潰，當我選擇在第二組分中的第六個值：

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

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] 
} 

您的代碼崩潰，因爲它的出指數爲第一陣列

Answer 2

我的ViewController

的頂部添加這些行

var colorString = "" 
var numberString = "" 

，改變didSelectRow功能是這樣的：

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 
    } 

現在工作得很好。