As of iOS 8 there are 20 different icon sizes required for a universal app as well as 20 different splash screen dimensions! Even if you already have an automated way of batch resizing these it’s a tedious process to identify and drag all of these images into their respective places and then deal with any conflicts.

Asset Catalog Creator can produce iPhone, iPad and OSX icons, Image sets in @1x, @2x and @3x, as well as iOS splash screens.

If you’ve never used Asset Catalogs in your apps before, now is a great time to start. You’ll find managing and organising your image files much easier and you’ll also benefit from improved performance; thanks to the smarter way asset catalogs are compiled and turned into binaries.

You can watch a demo of the app here http://youtu.be/UEy-Bphy28c

FEATURES
Support for @1x, @2x (Retina) and @3x (Retina HD) images
Support for up to iOS 8 asset sets
Support for all icons, splash screens and any image used in your view
Support for importing from png, jpg, bmp, pdf and more
Support for all iOS devices; iPhone 6, iPhone 6 Plus etc.
Automatic image naming
Previews for splash screens
Adjustable output sizes for UI assets
Automatic UI assets output point size calculation
Adjustable cropping options for splash screens
Adjustable background colours for splash screens

Compatibility: OS X 10.9 or later, 64-bit processor

Home Page - http://langui.net/asset-catalog-generator/