SwiftUI: OverflowScrollViewModifier (add scrollview automatically when view does not fit)

OverflowScrollViewModifier.swift

import SwiftUI

struct OverflowScrollViewModifier: ViewModifier {
    let maxHeight: CGFloat
    @State private var contentHeight: CGFloat = 0

    private var isContentOverflown: Bool {
        contentHeight > maxHeight
    }

    private func wrapped(_ content: Content, maxHeight: CGFloat) -> some View {
        content
            .fixedSize(horizontal: false, vertical: true)
            .onGeometryChange(for: CGFloat.self, of: \.size.height) {
                contentHeight = $0
            }
    }

    func body(content: Content) -> some View {
        Group {
            if isContentOverflown {
                ScrollView {
                    wrapped(content, maxHeight: maxHeight)
                }
                .frame(maxHeight: maxHeight)
            } else {
                wrapped(content, maxHeight: maxHeight)
            }
        }
    }
}

extension View {
    func scrollOnOverflow(maxHeight: CGFloat) -> some View {
        modifier(OverflowScrollViewModifier(maxHeight: maxHeight))
    }

    func scrollOnOverflow() -> some View {
        self
            .hidden()
            .overlay(
                GeometryReader { proxy in
                    modifier(OverflowScrollViewModifier(maxHeight: proxy.size.height))
                        .frame(maxHeight: proxy.size.height)
                }
            )
    }
}


#Preview {
    VStack {
        Spacer()
        Text("Hello, World! This is a very long text to test how it behaves when the content is very long so the size is adapted and the scroll is added automatically only when needed.")
//            .background(.red)
            .scrollOnOverflow()
        Rectangle()
            .frame(maxWidth: .infinity, maxHeight: 1)
        Text("Hello, World! This is a very long text to test how it behaves when the content is very long and there's no autoscroll modifier added so it truncates the text.")
//            .background(.red)
        Spacer()
    }
}

#Preview {
    VStack {
        Text("Hello, World! This is a very long text to test the popup and see how it behaves when the content is very long so the size is adapted and the scroll is added automatically only when needed.")
            .padding(20)
            .scrollOnOverflow(maxHeight: 200)

        Text("Something else")
    }
}