AssetCatalogGenerator allows you to create app icons and image sets. The program accepts virtually any kind of image that is supported by OS X. To create a universal iOS 8 app, you need to provide icons in 19 different sizes, as well as splash screens in 20 dimensions. For a modern OS X app you need to provide icons in 10 different sizes. It can be rather tedious and time-consuming to create these files manually.
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