ListScrollingProxy update for SwiftUI ScrollView programmatic scrolling

ListScrollingProxy.swift

//
//  ListScrollingProxy.swift
//
//  Created by gurkan soykan on 20.05.2022.
//

// source: https://stackoverflow.com/questions/60855852/how-to-scroll-list-programmatically-in-swiftui/60855853#60855853

import Foundation
import UIKit

class ListScrollingProxy {
    weak var sampleView: UIView?
    
    enum Action {
        case end
        case top
        case horizontalEnd
        case point(point: CGPoint) 
    }

    private var scrollView: UIScrollView?

    func catchScrollView(for view: UIView) {
        sampleView = view
        if nil == scrollView {
            scrollView = view.enclosingScrollView()
        }
    }

    func scrollTo(_ action: Action) {
        if scrollView == nil {
            if let sampleView = sampleView {
                scrollView = sampleView.enclosingScrollView()
            }
        }
        if let scroller = scrollView {
            var rect = CGRect(origin: .zero, size: CGSize(width: 1, height: 1))
            switch action {
                case .end:
                    rect.origin.y = scroller.contentSize.height +
                        scroller.contentInset.bottom + scroller.contentInset.top - 1
            case .horizontalEnd:
                rect.origin.x = scroller.contentSize.width +
                scroller.contentInset.right + scroller.contentInset.left - 1
            case .point(let point):
                    rect.origin.y = point.y
                default: {
                    // default goes to top
                }()
            }
            scroller.scrollRectToVisible(rect, animated: true)
        }
    }
}

extension UIView {
    func enclosingScrollView() -> UIScrollView? {
        var next: UIView? = self
        repeat {
            next = next?.superview
            if let scrollview = next as? UIScrollView {
                return scrollview
            }
        } while next != nil
        return nil
    }
}