Applying child view size to parent view

SizeCompatibleNavigationView.swift

import SwiftUI

struct SizePreferenceKey: PreferenceKey {
    static var defaultValue: CGSize = .zero
    static func reduce(value: inout CGSize, nextValue: () -> CGSize) {
        value = nextValue()
    }
}

struct SizeCompatibleNavigationView<Content: View>: View {
    @ViewBuilder var content: () -> Content
    @State private var bounds: CGSize = .zero
    var body: some View {
        NavigationView {
            content()
                .background(
                    GeometryReader { geo in
                        Color.clear
                            .preference(key: SizePreferenceKey.self, value: geo.size)
                    }
                )
        }
        .frame(width: bounds.width, height: bounds.height)
        .onPreferenceChange(SizePreferenceKey.self) { bounds in
            self.bounds = bounds
        }
    }
}