PencilKit sample

ContentView.swift

//
//  ContentView.swift
//  Drawing
//
//  Created by Akil Krishnan on 12/5/23.
//

import SwiftUI
import PencilKit

struct ContentView: View {
    var body: some View {
        PencilView()
    }
}

struct PencilView: UIViewRepresentable {
    @State var canvasView = PKCanvasView()
    @State var toolPicker = PKToolPicker()

    func makeUIView(context: Context) -> PKCanvasView {
        canvasView.contentSize = CGSize(
            width: UIScreen.main.bounds.width, 
            height: UIScreen.main.bounds.height
        )
        canvasView.backgroundColor = .clear
        canvasView.isScrollEnabled = false

        toolPicker.setVisible(true, forFirstResponder: canvasView)
        toolPicker.addObserver(canvasView)

        canvasView.becomeFirstResponder()

        return canvasView
    }

    func updateUIView(_ uiView: PKCanvasView, context: Context) {}
}

#Preview {
    ContentView()
}

DrawingApp.swift

//
//  DrawingApp.swift
//  Drawing
//
//  Created by Akil Krishnan on 12/5/23.
//

import SwiftUI

@main
struct DrawingApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .statusBarHidden(true)
        }
    }
}