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That's my current fall back, but it seems pretty hacky. I thought it would be .zero too, but it's actually (inf, inf, 0.0, 0.0). The other idea was testing the size of the data, 42 bytes.
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== should return a value based on the Equatable conformance. === checks for identity. Also PKDrawing is a struct according to my XCode (beta 6) and the developer documentation within XCode. I do see PKDrawing is listed as a class online though. I don't care so much about the implementation, I just need a way to check if a PKCanvasView is blank.
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This seems to be fixed if you install Xcode 11.0 beta 6.