I'm using a PaintCode StyleKit to generate a bunch of gradients, but PaintCode exports them as a CGGradient. I wanted to add these gradients a layer. Is it possible to convert a CGGradient to a CAGradientLayer?
No. The point of a CAGradientLayer is that you get to describe to it the gradient you want and it draws the gradient for you. You are already past that step; you have already described the gradient you want (to PaintCode instead of to a CAGradientLayer) and thus you already have the gradient you want. Thus, it is silly for you even to want to use a CAGradientLayer, since if you were going to do that, why did you use PaintCode in the first place? Just draw the CGGradient, itself, into an image, a view, or even a layer.