Graphics in ios games and applications?

Question

iOS

Colleagues, tell me, please, how who organizes graphic material for ios games and applications? If the application is only for iphone, then you still need to have graphics in two resolutions, which greatly increases the size of the bundle. And if the softinka is universal, then a third resolution is added.
I had thoughts on how to solve the issue:
1. Use graphics in one resolution (retina), and when running on another device, reduce the size to the desired one. (I don’t want to increase from a small one due to loss of quality)
2. Dig towards using vector graphics with subsequent rasterization during application initialization.
Maybe there is some more correct method?

Answer 1

We rendered in the required resolutions. Moreover, they actually rendered, and did not reduce it by 2 times (from the retina to 3GS)
. Especially if the application is universal (pad+background)

Answer 2

Write a script that, when deployed, will generate a raster from a vector at the desired dpi is not destiny?