ios app 发布时需要的图片资源

1. APP应用中的 icon 图片：icon29@2x, icon29@3x, icon40@2x, icon40@3x, icon60@2x, icon60@3x

   iPhone 6s Plus, iPhone 6 Plus	120px by 120px	87px by 87px
   iPhone 6s, iPhone 6, iPhone SE	80px by 80px	58px by 58px

2. itunesconnect上需要的icon图片：1024x1024
   itunesconnect上需要的屏幕截图：
   5.5 2208 x 1242 pixels for hi-res landscape
   4.7 1334 x 750 pixels for hi-res landscape
   4 1136 x 640 pixels for landscape (full screen) minimum
   3.5 960 x 640 pixels for hi-res landscape (full screen) maximum
   （要求都是 72 dpi, RGB, flattened, no transparency
   High-quality JPEG or PNG image file format）

参考：
https://developer.apple.com/ios/human-interface-guidelines/graphics/app-icon/#//apple_ref/doc/uid/TP40006556-CH27-SW1