Sorry, this one is even simpler. import SwiftUI import PencilKit struct ContentView: View { @State var canvas = CanvasTest() var body: some View { VStack { canvas Text("Pen") .onTapGesture { canvas.canvasView.tool = PKInkingTool(ink: PKInk(.pen), width: 4) } Text("Lasso") .onTapGesture { canvas.canvasView.tool = PKLassoTool() } } .padding() } } struct CanvasTest: UIViewRepresentable { let canvasView = PKCanvasView() func makeUIView(context: Context) -> some PKCanvasView { canvasView.drawingPolicy = .anyInput canvasView.tool = PKInkingTool(ink: PKInk(.pen), width: 20) return canvasView } func updateUIView(_ uiView: UIViewType, context: Context) { } }

This is the simplest reproduction code; Lasso works in 16.4, but not in 17. import SwiftUI import PencilKit struct ContentView: View { @State var canvas = CanvasTest() var body: some View { VStack { canvas Text("Pen") .onTapGesture { canvas.canvasView.tool = PKInkingTool(ink: PKInk(.pen), width: 4) } Text("Lasso") .onTapGesture { canvas.canvasView.tool = PKLassoTool() } } .padding() } } struct CanvasTest: UIViewRepresentable { let canvasView = PKCanvasView() func makeUIView(context: Context) -> some PKCanvasView { canvasView.drawingPolicy = .anyInput canvasView.tool = PKInkingTool(ink: PKInk(.pen), width: 20) canvasView.delegate = context.coordinator return canvasView } func updateUIView(_ uiView: UIViewType, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(self) } } extension CanvasTest { final class Coordinator: NSObject, PKCanvasViewDelegate { var parent: CanvasTest init(_ uiView: CanvasTest) { self.parent = uiView } } func canvasViewDrawingDidChange(_ canvasView: PKCanvasView) { canvasView.tool = PKLassoTool() } }