Every Adobe Digital Publishing Solution app for iOS must contain 6 splash screens in the following sizes: 1536 x 2048, 2048 x 1536, 640 x 960, 640 x 1136, 1242 x 2208, and 2208 x 1242 pixels. These splash screens must be saved in the PNG format. The splash screen appears on the screen momentarily while the app loads.
I’ve created an InDesign template to make creating these various sizes of the splash screens quick and easy. You can download the template here.
The template contains 6 pages in each of the pixel dimensions listed above. Create your desired artwork on the pages, then choose File > Export and export the pages in PNG format. Fill in the Export PNG dialog box as shown below, and PNGs with the exact dimensions required will be output.
If you are looking for a similar template for DPS 2014, see this post.