警报控制器中的Swift Xcode数字选择器，如Android

Question

您知道一种用变量定义的最大值和最小值创建数字选择器的方法吗？

在我的Android应用程序上，我创建了一个带有Picker编号的AlertDialog，并且最大数量链接到数据库中的值。是否可以在Swift中做同样的事情，或者做一些接近它的事情？

我的警报控制器代码：

func createAlertCarte1(Title:String, Message:String) {
        let alertCarte1 = UIAlertController(title: Title, message: Message, preferredStyle: UIAlertController.Style.alert)
        alertCarte1.addAction(UIAlertAction.init(title: "Ok", style: UIAlertAction.Style.default, handler: { (action1) in
            alertCarte1.dismiss(animated: true, completion: nil)
            self.displayAd()
        }))
        alertCarte1.addAction(UIAlertAction.init(title: "Annuler", style: UIAlertAction.Style.cancel, handler: { (action1) in
            alertCarte1.dismiss(animated: true, completion: nil)
        }))

        self.present(alertCarte1, animated: true, completion: nil)

    }

先谢谢您。

Answer 1

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    var pickerView: UIPickerView!
    var pickerData: [Int]!

    override func viewDidLoad() {
        super.viewDidLoad()
        pickerView = UIPickerView(frame: CGRect(x: 0, y: 50, width: 250, height: 150))
        pickerView.delegate = self
        pickerView.dataSource = self

        // This is where you can set your min/max values
        let minNum = 1
        let maxNum = 10
        pickerData = Array(stride(from: minNum, to: maxNum + 1, by: 1))
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        showAlert()
    }

    func showAlert() {
        let ac = UIAlertController(title: "Picker", message: "\n\n\n\n\n\n\n\n\n\n", preferredStyle: .alert)
        ac.view.addSubview(pickerView)
        ac.addAction(UIAlertAction(title: "OK", style: .default, handler: { _ in
            // code
        }))
        ac.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { _ in
            // code
        }))
        present(ac, animated: true)
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return pickerData.count
    }

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