struct ContentWrapperView: View {
    
    @EnvironmentObject var home: HomeGlobal
    
    var body: some View {
        ContentView(home: home)
    }
}


struct ContentView: View {
    var home: HomeGlobal
    
    // you can use HomeGlobal in init
    init (home: HomeGlobal) {
        self.home = home
    }
    
    var body: some View {
        Text("\(home.defaultNavHeight)")
    }
}

class HomeGlobal: ObservableObject {

    // Device compability
    let screenSize: CGSize = UIScreen.main.bounds.size
    let screenWidth: CGFloat = UIScreen.main.bounds.width
    let screenHeight: CGFloat = UIScreen.main.bounds.height
    private let referenceWidth: CGFloat = 375    // IPhone 8
    private let referenceHeight: CGFloat = 667   // IPhone 8
    var scaleFactor: CGFloat  {
        screenWidth / referenceWidth
    }
    let defaultPadding: CGFloat = 16             // IPhone 8
    let defaultNavHeight: CGFloat = 44           // IPhone 8
}

import SwiftUI

@main
struct ccApp: App {

    var body: some Scene {
        WindowGroup {
            ContentWrapperView().environmentObject(HomeGlobal())
        }
    }
}