Custom Action Sheet View Controller (UIKit + SwiftUI)

README.MD

Condider a new blank iOS project set to use Storyboard. Update the ViewController to match the above and add in the other files.

CustomActionSheet.swift

import SwiftUI

struct CustomActionSheet: View {
    @State private var offset: CGFloat = UIScreen.main.bounds.height
    @Binding var isShowing: Bool
    
    private var maxWidth: CGFloat { UIScreen.main.bounds.width }
    private var maxHeight: CGFloat { UIScreen.main.bounds.height }
    
    init(isShowing: Binding<Bool>) {
        _isShowing = isShowing
    }
    
    private var actionSheet: some View {
        VStack(spacing: 7) {
            Color.gray
                .frame(width: 45, height: 6)
                .cornerRadius(3)
            
            HStack {
                Spacer()
                VStack {
                    Text("1")
                    Text("2")
                    Text("3")
                    Text("4")
                }
                Spacer()
            }
            .padding(.bottom, (UIApplication.shared.windows.last?.safeAreaInsets.bottom ?? 0) + 40)
            .padding(.top, 20)
            .padding(.horizontal, 0)
            .background(Color.white)
            
            
        }
    }
    
    var body: some View {
        VStack {
            Spacer()
            actionSheet
                .offset(y: self.offset)
                .gesture(DragGesture()
                            .onChanged({ (value) in
                                if value.translation.height > 0 {
                                    self.offset = value.location.y
                                }
                            }).onEnded({ (value) in
                                showActionSheet(self.offset <= 100)
                            }))
            
        }
        .frame(width: maxWidth, height: maxHeight)
        .edgesIgnoringSafeArea(.all)
        .onChange(of: isShowing, perform: { value in
            showActionSheet(value)
        })
        .background((self.offset <= 100 ? Color.black.opacity(0.3) : Color.clear)
                        .edgesIgnoringSafeArea(.all)
                        .onTapGesture {
                            showActionSheet(false)
                        })
    }
    
    func showActionSheet(_ show: Bool) {
        withAnimation {
            offset = show ? 0 : maxHeight
        }
    }
}

CustomActionSheetViewController.swift

import SwiftUI
import UIKit

class CustomActionSheetViewController: UIViewController {
    private var internalVC: UIHostingController<CustomActionSheet>?
    var show = true
    lazy var isShowing: Binding<Bool> = .init {
        self.show
    } set: { show in
        self.show = show
        if !show {
            self.dismiss(animated: false, completion: nil)
        }
    }

    lazy var testView = CustomActionSheet(isShowing: isShowing)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let ivc = UIHostingController(rootView: testView)
        internalVC = ivc
        view.addSubview(ivc.view)
        ivc.view.backgroundColor = .clear
        
        ivc.view.translatesAutoresizingMaskIntoConstraints = false
        ivc.view.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        ivc.view.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
        ivc.view.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
        ivc.view.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        isShowing.wrappedValue = true
        isShowing.update()
    }
}

ViewController.swift

import UIKit

class ViewController: UIViewController {
    let button = UIButton(type: .system)

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        view.backgroundColor = .white
        
        button.setTitle("TAP THIS BUTTON", for: .normal)
        
        view.addSubview(button)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        
        button.addTarget(self, action: #selector(tapped), for: .touchUpInside)
        
        
    }
    
    @objc private func tapped() {
        let vc = CustomActionSheetViewController()
        vc.modalPresentationStyle = .overCurrentContext
        present(vc, animated: false)
    }


}

The view controller presenting this:

class ViewController: UIViewController {
    let button = UIButton(type: .system)

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        view.backgroundColor = .white
        
        button.setTitle("TAP THIS BUTTON", for: .normal)
        
        view.addSubview(button)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        button.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        
        button.addTarget(self, action: #selector(tapped), for: .touchUpInside)
        
        
    }
    
    @objc private func tapped() {
        let vc = CustomActionSheetViewController()
        vc.modalPresentationStyle = .overCurrentContext
        present(vc, animated: false)
    }


}