iOS PencilKit not drawing on the PKCanvasView

Question

In iOS Simulator, I've followed the basic steps to include PencilKit into my view controller. I got the toolKit in the UI but couldn't draw.. Not sure what I'm missing here. Sharing my code which I tried.

import UIKit
import PencilKit

class DrawingBoardViewController: UIViewController {

@IBOutlet weak var canvasView: PKCanvasView!

 override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)       
        setupCanvasView()
    }

 func setupCanvasView() {
                
        let toolPicker = PKToolPicker.init()
        toolPicker.setVisible(true, forFirstResponder: canvasView)
        toolPicker.addObserver(canvasView)
        toolPicker.isRulerActive = false
        canvasView.isOpaque = true
        canvasView.becomeFirstResponder()
        canvasView.drawingPolicy = .anyInput
        
    }
}

Kindly let me know what I'm missing here..

Answer 1

This should fix your issue:

import UIKit
import PencilKit

class DrawingBoardViewController: UIViewController {

@IBOutlet weak var canvasView: PKCanvasView!

let toolPicker = PKToolPicker.init()

 override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)       
        setupCanvasView()
    }

 func setupCanvasView() {
                
        toolPicker.setVisible(true, forFirstResponder: canvasView)
        toolPicker.addObserver(canvasView)
        toolPicker.isRulerActive = false
        canvasView.isOpaque = true
        canvasView.becomeFirstResponder()
        canvasView.drawingPolicy = .anyInput
        
    }
}