Create a Bottom Sheet SwiftUI View and present from UIKit UIViewController

BottomSheetPeopleDetectedInputView+SwiftUI+UIKit.swift

class ViewController: UIViewController, BottomSheetPeopleDetectedInputDelegate {
    private var overlayView: UIView?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        
        let showButton = UIButton(type: .system)
        showButton.setTitle("Show Bottom Sheet", for: .normal)
        showButton.addTarget(self, action: #selector(showBottomSheet), for: .touchUpInside)
        
        showButton.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(showButton)
        
        NSLayoutConstraint.activate([
            showButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            showButton.centerYAnchor.constraint(equalTo: view.centerYAnchor)
        ])
    }
    
    @objc func showBottomSheet() {
        let bottomSheetView = BottomSheetPeopleDetectedInputView(delegate: self)
        let hostingController = UIHostingController(rootView: bottomSheetView)
        
        let targetSize = hostingController.view.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
        hostingController.preferredContentSize = targetSize
        
        // Set the corner radius for the hosting controller's view
        hostingController.view.layer.cornerRadius = 16
        hostingController.view.layer.masksToBounds = true
        
        if let sheet = hostingController.sheetPresentationController {
            sheet.detents = [.custom(resolver: { _ in (targetSize.height + 80) })]
            //sheet.detents = [.medium()]
            sheet.prefersGrabberVisible = true
        }
        
        present(hostingController, animated: true, completion: nil)
        
        // Add the gray overlay
//        let overlay = UIView(frame: self.view.bounds)
//        overlay.backgroundColor = UIColor.black.withAlphaComponent(0.5)
//        view.addSubview(overlay)
//        self.overlayView = overlay
//        
//        let bottomSheetView = BottomSheetPeopleDetectedInputView(delegate: self)
//        let hostingController = UIHostingController(rootView: bottomSheetView)
//        
//        // Set the corner radius for the hosting controller's view
//        hostingController.view.layer.cornerRadius = 16
//        hostingController.view.layer.masksToBounds = true
//        
//        // Calculate the height of the bottom sheet based on the content
//        let targetSize = hostingController.view.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
//        
//        // Set up modal presentation style
//        hostingController.modalPresentationStyle = .overCurrentContext
//        hostingController.view.backgroundColor = .clear
//        
//        // Present the view controller
//        present(hostingController, animated: true) {
//            // Adjust the frame to appear as a bottom sheet
//            hostingController.view.frame = CGRect(
//                x: 0,
//                y: (self.view.frame.height - targetSize.height) - 80,
//                width: self.view.frame.width,
//                height: targetSize.height + 80
//            )
//        }
    }
    
    func didSubmitText(_ text: String) {
        // Handle the text received from the BottomSheetView
        print("Received text: \(text)")
    }
    
    func dismissSheet() {
        dismiss(animated: true) {
            // Remove the overlay with animation when dismissing the bottom sheet
            UIView.animate(withDuration: 0.3, animations: {
                self.overlayView?.alpha = 0.0
            }) { _ in
                self.overlayView?.removeFromSuperview()
                self.overlayView = nil
            }
        }
    }
}

import SwiftUI

struct BottomSheetPeopleDetectedInputView: View {
    @State private var detectedPeopleCount: Int = 1
    
    weak var delegate: BottomSheetPeopleDetectedInputDelegate?
    
    init(delegate: BottomSheetPeopleDetectedInputDelegate? = nil) {
        self.delegate = delegate
    }
    
    var body: some View {
        VStack(spacing: 20) {
            // MARK: A small drag handle at the top if needed
//            RoundedRectangle(cornerRadius: 3)
//                .frame(width: 40, height: 5)
//                .foregroundColor(Color.gray.opacity(0.5))
//                .padding(.top, 8)
            
            Text("Orang Terdeteksi")
                .font(.system(size: 16, weight: .bold)) // Body/Large/Bold
                .padding(.top, 8)
                .padding(.bottom, 32)
            
            VStack(alignment: .leading) {
                Text("Atur jumlah orang yang harus ada di area deteksi")
                    .font(.system(size: 12, weight: .regular)) // Body/Small/Regular
                    .foregroundColor(.gray)
                    .multilineTextAlignment(.leading)
                    .padding(.bottom, 2.5)
                
                HStack {
                    // Minus button
                    Button(action: {
                        if detectedPeopleCount > 0 {
                            detectedPeopleCount -= 1
                        }
                    }) {
                        Image(systemName: "minus")
                            .resizable()
                            .aspectRatio(contentMode: .fit)
                            .frame(width: 20, height: 20)
                            .foregroundColor(.blue)
                    }
                    
                    Spacer()
                    
                    // Displaying the count in the center
                    TextField("", value: $detectedPeopleCount, formatter: NumberFormatter())
                        .font(.title2)
                        .multilineTextAlignment(.center)
                        .keyboardType(.numberPad)
                        .frame(width: 60, height: 70)
                    
                    Spacer()
                    
                    // Plus button
                    Button(action: {
                        detectedPeopleCount += 1
                    }) {
                        Image(systemName: "plus")
                            .resizable()
                            .aspectRatio(contentMode: .fit)
                            .frame(width: 20, height: 20)
                            .foregroundColor(.blue)
                    }
                }
                .padding(.horizontal, 16)
                //.padding(.vertical, 35)
                .background(Color.white) // White background
                .cornerRadius(8)
                .overlay(
                    RoundedRectangle(cornerRadius: 8)
                        .stroke(.gray, lineWidth: 1)
                )
            }
            .padding(.horizontal, 16)
            .padding(.bottom, 26)
            
            // Apply button
            Button(action: {
                // Action for button
                delegate?.didSubmitText("\(detectedPeopleCount)")
                delegate?.dismissSheet()
            }) {
                Text("Terapkan")
                    .font(.system(size: 16, weight: .bold))
                    .foregroundColor(.white)
                    .frame(maxWidth: .infinity)
                    .padding()
                    .background(Color.blue)
                    .cornerRadius(10)
            }
            .cornerRadius(.infinity)
            .padding(.horizontal, 16)
            .padding(.bottom, 20)
        }
        .padding()
        .background(Color.white)
        .cornerRadius(20)
        .frame(maxWidth: .infinity, alignment: .bottom)
    }
}

protocol BottomSheetPeopleDetectedInputDelegate: AnyObject {
    func didSubmitText(_ text: String)
    func dismissSheet()
}

I have used layoutFittingExpandedSize instead of layoutFittingCompressedSize now it works like a charm

👍🏻

wow thanks for the suggestion @shkfaiz @hustlzp