从选择器视图（选择器轮）中获取选定的值

Question

我目前正在使用 XCode 版本 11.3.1 (11C505) 和 Swift 5，我似乎无法找到关于如何从选择轮（视图）中获取所选值的好答案。 这是我的ViewController.swift中的相关代码

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])
    }
}

编辑：解决方案也在评论中，所以我想我会把它放在这里以防其他人发现这个： 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)])"应该只是test.text = "\test.text = "\(possibleNums[row])"

Answer 1

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

你只有一个组件，所以你不需要检查它，只需返回行号作为数组的索引。

Answer 2

最简单的方法是将您的didSelectRow function 从

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

至

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