SwiftUIDocumentationUIViewRepresentable

SwiftUIDocumentationUIViewRepresentable.swift

import SwiftUI

final class DataModel: ObservableObject {
  static let shared = DataModel()
  @Published var text = String() {
    didSet {
      UserDefaults.standard.set(text, forKey: "text")
    }
  }
}

struct ContentView : View {
  var body: some View {
    MultiTextView()
      .padding()
  }
}

struct MultiTextView: UIViewRepresentable {
  @ObservedObject var data = DataModel.shared
  
  func makeUIView(context: Context) -> UITextView {
    let view = UITextView()
    view.isScrollEnabled = true
    view.isEditable = true
    view.isUserInteractionEnabled = true
    view.textAlignment = .left
    view.delegate = context.coordinator
    view.font = UIFont.systemFont(ofSize: 18)
    if let loadedText = UserDefaults.standard.string(forKey: "text") {
      view.text = loadedText
    }
    else {
      view.text = "Start typing here"
    }
    return view
  }
  
  func updateUIView(_ uiView: UITextView, context: Context) {
    view.text = data.text
  }
  
  func makeCoordinator() -> MultiTextView.Coordinator {
    Coordinator(self)
  }
  
  class Coordinator: NSObject, UITextViewDelegate {
    var control: MultiTextView
    
    init(_ control: MultiTextView) {
      self.control = control
    }
    
    func textViewDidChange(_ textView: UITextView) {
      control.data.text = textView.text
    }
  }
}