UnderConstructionModifier.swift

import SwiftUI

struct UnderConstructionModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .redacted(reason: .placeholder)
            .blur(radius: 8)
            .overlay(Color.pink.opacity(0.33))
            .overlay(
                Text("🚧🚧🚧")
                    .font(.largeTitle)
            )
            .cornerRadius(.roundedMedium)
    }
}

public extension View {
    @ViewBuilder
    @available(*, deprecated, message: "Don't leave it under construction mate")
    func underConstruction(if active: Bool = true) -> some View {
        if active {
            modifier(UnderConstructionModifier())
        } else {
            self
        }
    }
}

struct UnderConstructionModifier_Previews: PreviewProvider {
    static var previews: some View {
        HStack {
            Rectangle()
                .fill(.red)
                .frame(width: 64, height: 64)

            VStack(alignment: .leading) {
                Text("Homer Simpson")
                    .font(.title3)
                Text("Nuclear Safety Inspector")
                    .font(.caption)
            }
        }
        .padding()
        .underConstruction()
    }
}