iOS应用图标及尺寸

Icon and Image Sizes

Every app needs an app icon and a launch file or image. In addition, some apps need custom icons to represent app-specific content, functions, or modes in navigation bars, toolbars, tab bars, and other areas. Table 45-1 lists the sizes required for these custom icons and images.

Table 45-1Size (in pixels) of custom icons and images

Asset	iPhone 6s Plus and iPhone 6 Plus (@3x)	iPhone 6s, iPhone 6, and iPhone 5 (@2x)	iPhone 4s (@2x)	iPad and iPad mini (@2x)	iPad 2 and iPad mini (@1x)	iPad Pro (@2x)
App icon (requiredfor all apps)	180 x 180	120 x 120	120 x 120	152 x 152	76 x 76	167 x 167
App icon for the App Store (requiredfor all apps)	1024 x 1024	1024 x 1024	1024 x 1024	1024 x 1024	1024 x 1024	1024 x 1024
Launch file or image (requiredfor all apps)	Use a launch file (see Launch Files)	For iPhone 6s and iPhone 6, use a launch file (see Launch Files) For iPhone 5, 640 x 1136	640 x 960	1536 x 2048 (portrait) 2048 x 1536 (landscape)	768 x 1024 (portrait) 1024 x 768 (landscape)	2048 x 2732 (portrait) 2732 x 2048 (landscape)
Spotlight search results icon (recommended)	180 x 180	For iPhone 6s and iPhone 6, use 120 x 120 For iPhone 5, use 80 x 80	80 x 80	120 x 120	60 x 60	120 x 120
Settings icon (recommended)	87 x 87	58 x 58	58 x 58	58 x 58	29 x 29	58 x 58
Toolbar and navigation bar icon (optional)	About 66 x 66	About 44 x 44	About 44 x 44	About 44 x 44	About 22 x 22	About 44 x 44
Tab bar icon (optional)	About 75 x 75 (maximum: 144 x 96)	About 50 x 50 (maximum: 96 x 64)	About 50 x 50 (maximum: 96 x 64)	About 50 x 50 (maximum: 96 x 64)	About 25 x 25 (maximum: 48 x 32)	About 50 x 50 (maximum: 96 x 64)
Web clip icon (recommended for web apps and websites)	180 x 180	120 x 120	120 x 120	152 x 152	76 x 76	167 x 167

NOTE

If you need to create custom icons for Home screen quick actions, see Home Screen Quick Actions for details.

With the exception of the App Store icon—which must be named iTunesArtwork—you can name your icons anything you want. Use image asset entries in your Xcode project for your app’s icon files. To add icons, assign the corresponding image files to the image assets of your project. At build time, Xcode adds the appropriate keys to your app’s Info.plist file and places the images in your app bundle. iOS chooses an icon based on whether its size is appropriate for the intended usage. To learn more about asset catalogs, see Asset Catalog Help.

For all images and icons, the PNG format is recommended. You should avoid using interlaced PNGs.

The standard bit depth for icons and images is 24 bits.

参考：https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/MobileHIG/IconMatrix.html#//apple_ref/doc/uid/TP40006556-CH27-SW1