.swift

import SwiftUI

struct Facebook: View {
    
    @EnvironmentObject var userSettings: UserSettings
    
    var body: some View {
        
        VStack {
            Text("Facebook")
            Button("👍") {
                self.userSettings.likes += 1
            }
        }
    }
}

struct Twitter: View {
    
    @EnvironmentObject var userSettings: UserSettings
    
    var body: some View {
        
        VStack {
            Text("Twitter")
            Button("👍") {
                self.userSettings.likes += 1
            }
        }
    }
}