Currently there is no way to check if a PKCanvasView is blank. I submitted a bug via the feedback app a week ago, but it says "No similar reports." This seems like a pretty big deal, and I was wondering if anyone has been able to check a PKCanvasView to see if it's blank. The demo app uses the PKCanvasViewDelegate to flip a bool when drawing starts, but this is not really valid. If a user draws and then erases back to a blank canvas, it will still report the canvas as "dirty." I don't think saving a bunch of blank canvases is user friendly.