[Swift] PKToolPicker in iOS14

#iOS14でPKToolPickerのshared(for:)がDeprecatedされている件

これまでのやり方

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

iOS14 でのやり方

PKToolPickerのインスタンスをmakeUIView外で宣言。

@Binding var canvasView: PKCanvasView
let toolPicker = PKToolPicker.init()

func makeUIView(context: Context) -> PKCanvasView {
        self.canvasView.tool = PKInkingTool(.pen, color: .black, width: 15)
      
        toolPicker.addObserver(canvasView)
        toolPicker.setVisible(true, forFirstResponder: canvasView)
        canvasView.becomeFirstResponder()
        return canvasView
}