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iOS

If they are vector: why are there "small" and "large" image assets?

I don't get it.

If they are vector assets, why does the video show creating both small and large versions of these assets? What is the benefit there?

Also, why use PDFs? I haven't seen anything else mention this, it's an odd format choice.

The answer on the PDF format is it's all apple supports: http://martiancraft.com/blog/2014/09/vector-images-xcode6/

This isn't actual Vector support, and that's an important point. Xcode just generates PNGs at build time. This should probably be noted.