從選擇器視圖（選擇器輪）中獲取選定的值

Question

我目前正在使用 XCode 版本 11.3.1 (11C505) 和 Swift 5，我似乎無法找到關於如何從選擇輪（視圖）中獲取所選值的好答案。 這是我的ViewController.swift中的相關代碼

class ViewController: UIViewController {
    @IBOutlet weak var numberPicker: UIPickerView!
    @IBOutlet weak var test: UILabel!

    private let possibleNums: [Int] = Array(1...16) // Create an array of Ints from 1 to 16
       
    override func viewDidLoad() {
        super.viewDidLoad()
        numberPicker.dataSource = self
        numberPicker.delegate = self
    }
}


extension ViewController: UIPickerViewDataSource {
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return possibleNums.count
    }
    // Attempt at getting the selected value, didn't work
    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int {
        print(possibleNums[numberPicker.selectedRow(inComponent: 0)])
        test.text = "\(possibleNums[numberPicker.selectedRow(inComponent: 0)])"
    }
}

extension ViewController: UIPickerViewDelegate {
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return String(possibleNums[row])
    }
}

編輯：解決方案也在評論中，所以我想我會把它放在這里以防其他人發現這個： func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int should be func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int (missing _ ) and test.text = "\(possibleNums[numberPicker.selectedRow(inComponent: 0)])"應該只是test.text = "\test.text = "\(possibleNums[row])"

Answer 1

test.text = "\(possibleNums[numberPicker.selectedRow(inComponent: 0)])"更改為： test.text = "\(possibleNums[row])"

你只有一個組件，所以你不需要檢查它，只需返回行號作為數組的索引。

Answer 2

最簡單的方法是將您的didSelectRow function 從

test.text = "\(possibleNums[numberPicker.selectedRow(inComponent: 0)])"

至

test.text = "\(possibleNums[rows])"