A SwiftUI sheet that sizes itself based on the height needed by the contained view

FittingSheet.swift

extension View {
    
    func fittingSheet<Content: View>(
        isPresented: Binding<Bool>,
        backgroundColor: Color? = nil,
        additionalDetents: Set<PresentationDetent> = [],
        shouldShowDragIndicator: Bool = true,
        onDismiss: (() -> Void)? = nil,
        content: @escaping () -> Content
    ) -> some View {
        
        modifier(FittingSheet(isPresented: isPresented,
                              backgroundColor: backgroundColor,
                              additionalDetents: additionalDetents,
                              shouldShowDragIndicator: shouldShowDragIndicator,
                              onDismiss: onDismiss,
                              sheetContent: content))
    }
}

struct FittingSheet<SheetContent: View>: ViewModifier {
    
    @Binding
    var isPresented: Bool
    
    let backgroundColor: Color?
    let additionalDetents: Set<PresentationDetent>
    let shouldShowDragIndicator: Bool
    let onDismiss: (() -> Void)?
    let sheetContent: () -> SheetContent
    
    @State
    private var height: CGFloat = 0
    
    func body(content: Content) -> some View {
        
        content
            .sheet(
                isPresented: $isPresented,
                onDismiss: onDismiss
            ) {
                ZStack {
                    backgroundColor?.ignoresSafeArea()
                    sheetContent()
                        .frame(maxWidth: .infinity)
                        .background(
                            GeometryReader { proxy in
                                Color.clear
                                    .onAppear {
                                        self.height = proxy.size.height
                                    }
                            }
                        )
                        .presentationDetents(Set([.height(height)] + additionalDetents))
                        .presentationDragIndicator(.visible)
                }
            }
    }
}