Option (totally new functionality) to just set a rectangle inside image

[sabiland]

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It would be really cool (at least for me) if there would be option to just set (with existing UI and gestures, etc.) a rectangle inside loaded image, and completion handler would just return this rectangle (CGRect).

For me it would be cool to have this, so user would easily specify rectangle inside which I could perform some drawing manually (drawing text, etc.).