Show UIKit alert in SwiftUI.

UIAlertControllerWrapper.swift

// SwiftUI alert has so many problems. Use UIKit instead.

import UIKit

struct UIAlertControllerWrapper {
    static func present(alert: UIAlertController) {
        if let scene = UIApplication.shared.connectedScenes.first as? UIWindowScene, let root = scene.windows.first?.rootViewController {
            var nextViewController = root
            while nextViewController.presentedViewController != nil {
                nextViewController = nextViewController.presentedViewController!
            }
            nextViewController.present(alert, animated: true, completion: nil)
        }
    }
}