Proyect Code: ContentView.swift and EOConfig (Environment Object Configuration)

ContentView.swift

//
//  ContentView.swift
//  
//
//  Created by Alejandro D on 22/03/20.
//  Copyright © 2020 Alejandro D. All rights reserved.
//
import SwiftUI
import Combine

extension View {
    func keyboardSensible(_ offsetValue: Binding<CGFloat>) -> some View {
        
        return self
            .padding(.bottom, offsetValue.wrappedValue)
            .animation(.spring())
            .onAppear {
                NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillShowNotification, object: nil, queue: .main) { notification in
                    
                    let keyWindow = UIApplication.shared.connectedScenes
                        .filter({$0.activationState == .foregroundActive})
                        .map({$0 as? UIWindowScene})
                        .compactMap({$0})
                        .first?.windows
                        .filter({$0.isKeyWindow}).first
                    
                    let bottom = keyWindow?.safeAreaInsets.bottom ?? 0
                    
                    let value = notification.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as! CGRect
                    let height = value.height
                    
                    offsetValue.wrappedValue = height - bottom
                }
                
                NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillHideNotification, object: nil, queue: .main) { _ in
                    offsetValue.wrappedValue = 0
                }
        }
    }
}

/// The TextView
struct TextView: UIViewRepresentable {
    @Binding var text: String
    @Binding var edit:Bool
    @Binding var select:Bool
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    func makeUIView(context: Context) -> UITextView {

        let myTextView = UITextView()
        myTextView.delegate = context.coordinator
        myTextView.font = UIFont(name: "RobotoMono-Regular", size: 9)
        myTextView.isScrollEnabled = false
        myTextView.isEditable = edit
        myTextView.isUserInteractionEnabled = select
        myTextView.isSelectable = select
        myTextView.backgroundColor = UIColor(white: 0.0, alpha: 0.05)

        return myTextView
    }

    func updateUIView(_ uiView: UITextView, context: Context) {
        uiView.text = text
    }

    class Coordinator : NSObject, UITextViewDelegate {

        var parent: TextView

        init(_ uiTextView: TextView) {
            self.parent = uiTextView
        }

        func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
            return true
        }

        func textViewDidChange(_ textView: UITextView) {
            
            print("text now: \(String(describing: textView.text!))")
            self.parent.text = textView.text
        }
    }
}



/// The main View of the app
struct ContentView: View {
    @EnvironmentObject var vars : Data
    
    @State private var offsetValue: CGFloat = 0.0
    @State var bTrue = true
    @State var bFalse = false
    var body: some View {
        ZStack {
            ScrollView (Axis.Set.horizontal) {
                ScrollView  {
                    HStack {
                        TextView(text: /*vars.*/$vars.numeroLinea, edit: $bFalse, select: $bFalse)
                            .frame(width: 20.0)
                        Divider()
                        TextView(text: /*vars.*/$vars.texto, edit: $bTrue, select: $bTrue)
                    }.padding()
                }
            }
            
            VStack {
                Spacer()
                HStack {
                    Spacer()
                    //TextField(/*@START_MENU_TOKEN@*/"Placeholder"/*@END_MENU_TOKEN@*/, text: /*@START_MENU_TOKEN@*//*@PLACEHOLDER=Value@*/.constant("")/*@END_MENU_TOKEN@*/)
                    Button(action: {
                        //self.texto = self.texto + "\n"
                        UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
                    }) {
                        ZStack {
                            Circle()
                                .frame(width: 50.0, height: 50.0)
                                .foregroundColor(/*@START_MENU_TOKEN@*/.white/*@END_MENU_TOKEN@*/)
                                .shadow(radius: 4.0)
                            Image("Rayo").resizable()
                                .frame(width: 15.0, height: 28.7)
                                .shadow(radius: 1.0)
                                .foregroundColor(.black)
                        }
                    }
                }
            }.padding([.bottom, .trailing], 40.0)
            .keyboardSensible($offsetValue)

        }
        
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

EOConfig.swift

//
//  EOConfig.swift
//  
//
//  Created by Alejandro D on 22/03/20.
//  Copyright © 2020 Alejandro D. All rights reserved.
//

import Foundation

class Data : ObservableObject {
    private var numeroLineaInt = 1
    private var charDetected = false
    @Published var numeroLinea : String = "1\n" //Number of Line
    @Published var texto : String = "" {
        willSet{
        }
        didSet{
            let nsString = self.texto as NSString
            self.numeroLineaInt = 1
            nsString.enumerateLines{ (str,_) in
                self.numeroLineaInt = self.numeroLineaInt + 1
            }
            
            self.numeroLinea = ""
            for i in 1...numeroLineaInt {
                self.numeroLinea = self.numeroLinea + String(i) + "\n"
            }
        }
    }
}