Beginning of a version 2?

[borgeser]

Hi Joe,

I really like your work and I'd like to contribute to this library 👍

I see two axes of improvements for this project: code cleaning and new features.

For new features, it would be nice to be able to use the ScratchView from a xib or a storyboard (issue #6).
It would also be nice to be able to fetch the image easily (issue #4).
It would also be great to be able to dynamically change the width/height of the view.

For code cleaning, I suggest:

• fixing typos
• removing commented code
• replacing explicit unwrapping (!) by optional (?) or non-optional (no modifier)
• better encapsulation
• less instance variables
• make the code Swiftier: if self.delegate != nil { self.delegate.began(self) } -> delegate?.began(self) for instance

Maybe we could also work on architecture. I think the class ScratchUIView is useless today, it's just a proxy for a delegate.
I think a good class ScratchView, with a nice set of features, can do all the work.

Here you have two commits to show you what I can do.
The changes are not backward compatible so I don't expect them to be merged as it.
But it could be a start for a version 2.

Tell me what you think about it, we can discuss somewhere else if you want.

Regards,

Roland.