About iOS14 of PencilKit

environment ・MacOS: 10.15.7 ・Xcode: 12.1 ・iOS: 14.1

I am trying to PencilKit and but I cannot show PKToolPicker. I set my code as below:

if let window = UIApplication.shared.windows.first {
    if let toolPicker = PKToolPicker.shared(for: window) {
        toolPicker.addObserver(canvas)
        toolPicker.setVisible(true, forFirstResponder: canvas)
        canvas.becomeFirstResponder()
    }
}

I get a warning here:

'shared(for:)' was deprecated in iOS 14.0: Create individual instances instead.

So I changed it like this

let toolPicker = PKToolPicker.init()
toolPicker.addObserver(canvas)
toolPicker.setVisible(true, forFirstResponder: canvas)
canvas.becomeFirstResponder()

After all the PKToolPicker is not displayed

I am aiming to display such PKToolPicker

Please give me advice

I solved it like this

toolPicker.addObserver(canvas)
toolPicker.setVisible(true, forFirstResponder: canvas)
canvas.becomeFirstResponder()