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I have made a UIView in which I have collected some points into a closed polygon using CGmutablePathRef. I am drawing them with a CGContext. I now want to ‘flip’ the UIView that these polygons lie in. I do not have a transform to flip the vertices with though. Where do I get one? How do I go about this? Where do I find some reading material and a code example of what I am generally describing here?
Alright, the answer for me was the CALayer that underlies every UIView. That CALayer has a method for getting the affineTransform. The affineTransform can then be modified with CATransform3DMakeRotation. Rob Napier turned me on to CALayer concept here . Ray Wenderlich explained access to the CALayer here (including drawing to it), and rotating the CALayer was covered here.