iOS Modal Sheet (SwfitUI)

ContentView.Swift

//
//  ContentView.swift
//  bottom-sheet
//
//  Created by Sean Perkins on 3/22/22.
//
import SwiftUI
struct ContentView: View {
    var body: some View {
        Home()
    }
}
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
struct Home: View {
    @State var showSheet: Bool = false
    
    
    var body: some View {
        NavigationView {
            Button {
                showSheet.toggle()
            } label: {
                Text("Present Sheet")
            }
            .navigationTitle("Modal Sheet")
            .halfSheet(showSheet: $showSheet) {
                ZStack {
                    Color.red
                    
                    VStack {
                        Text("Hello World")
                            .font(.title.bold())
                            .foregroundColor(.white)
                        
                        Button {
                            showSheet.toggle()
                        } label: {
                            Text("Dismiss")
                                .foregroundColor(.white)
                        }
                        .padding()
                    }
                }
                .ignoresSafeArea()
            } onEnd: {
                print("Dismissed")
            }
        }
    }
}
extension View {
    
    func halfSheet<SheetView: View>(showSheet: Binding<Bool>, @ViewBuilder sheetView: @escaping ()->SheetView, onEnd: @escaping ()->())->some View {
        return self
            .background(
                HalfSheetHelper(sheetView: sheetView(), showSheet: showSheet, onEnd: onEnd)
            )
    }
}
struct HalfSheetHelper<SheetView: View>: UIViewControllerRepresentable {
    var sheetView: SheetView
    @Binding var showSheet: Bool
    var onEnd: () ->()
    
    let controller = UIViewController()
    
    func makeCoordinator()-> Coordinator {
        return Coordinator(parent: self)
    }
    
    func makeUIViewController(context: Context) -> UIViewController {
        
        controller.view.backgroundColor = .clear
        
        return controller
    }
    
    func updateUIViewController(_ uiViewControlller: UIViewController, context: Context) {
        if showSheet {
            let sheetController = CustomHostingController(rootView: sheetView)
            sheetController.presentationController?.delegate = context.coordinator
            
            uiViewControlller.present(sheetController, animated: true)
        } else {
            uiViewControlller.dismiss(animated: true)
        }
    }
    
    class Coordinator: NSObject, UISheetPresentationControllerDelegate {
        var parent: HalfSheetHelper
        
        init (parent: HalfSheetHelper) {
            self.parent = parent
        }
        
        func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
            parent.showSheet = false
            parent.onEnd()
        }
    }
}
class CustomHostingController<Content: View>: UIHostingController<Content> {
    override func viewDidLoad() {
        view.backgroundColor = .clear
        if let presentationController = presentationController as? UISheetPresentationController {
            presentationController.detents = [
                .medium(),
                .large()
            ]
            
            presentationController.prefersGrabberVisible = true
            
        }
    }
    
}