I have programmed a SwiftUI app to draw paths on the iPad with the Apple Pencil. I use the following structure for this:

...

DrawingView(pencilPoints: $pencilPointArray)

.gesture(DragGesture(minimumDistance: 0)

.onChanged({ value in

code

})

.onEnded({ _ in

code

})

...

struct DrawingView: UIViewRepresentable {

@Binding var pencilPoints: [CGPoint]

code

}

How can I prevent input with the finger? Only input with the Pencil should be allowed.

Many thanks for help in advance Roonster

DrawingView(pencilPoints: $pencilPointArray)
    .gesture(DragGesture(minimumDistance: 0)
    .onChanged({ value in
        // code
    })

    .onEnded({ _ in
        // code
    })

...

struct DrawingView: UIViewRepresentable {
    @Binding var pencilPoints: [CGPoint]
        // code
}

You should look up StrokeGestureRecognizer and the relevant Apple documentation around that, so that you can distinguish between a finger and the Apple Pencil - try this link to Apple Developer.