1. Create an app, icon, and Launch Images
1.1 icon size requirements
Icon requirements: Two images in the format of * 57 png are prepared for small-resolution mobile phones.
The format of * 114png is available for iPhone 5, iPhone 4, and iPhone 4S.
1.2 Launch Images
Usd×0000480 for older mobile phones
2: 640*960 for iphone 4 and iphone 4S
3: 640 RMB x 1136 prepared for iPhone 5
Project three different resolution image suffixes requirements
2. Publish the app in itunes. Preparations
 3.5-inch iPhone and iPod touch Retina screen
640*960 resolution image color at least 72 DPI
 4 inch iPhone and iPod touch Retina screen
1136x640 resolution image color at least 72 DPI
1024*1024 resolution: Non-stretched png images with a minimum color of 72 DPI