Xcode 5 has an awesome new feature called "asset catalogs", allowing you to specify all of your image variants and resizable cap insets in a single place.

Unfortunately, to get the full benefits, you have to set your deployment target to iOS 7; otherwise, Xcode will dutifully put all of the images into your app bundle but totally ignore all of your resizable insets with only a build warning.

But shucks! The important and awesome part is the editor, and it puts all of the data out in super-readable JSON. We should be able to do a poor man's version that reads in the data and spits out some code to give you most of the benefits.

Call objc-assetgen with the .xcassets paths as arguments from the directory into which it should output the code.

For an asset catalog named "Foo" containing image sets "Bar" and "Baz", you'll get FooCatalog.h and FooCatalog.m, with class methods + (UIImage *)imageForBar and + (UIImage *)imageForBaz. Put them in your DerivedSources folder and you're good to go.

Usage:

• objc-assetgen [-o <path>] [-f <path>] [-p <prefix>] [<paths>]
• objc-assetgen -h

Options:

-o <path>

Output files at <path>

-f <path>

Search for *.xcassets folders starting from <path>

-p <prefix>

Use <prefix> as the class prefix in the generated code

-h

Print this help and exit

<paths>

Input files; this and/or -f are required.