ios icon和启动image尺寸介绍
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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, and tab bars.
Unlike other custom artwork in your app, the icons and images listed in Table 39-1 must meet specific criteria so that iOS can display them properly. In addition, some icon and image files have naming requirements (to learn about naming these files, see App Icons in App Programming Guide for iOS and App Launch (Default) Images in App Programming Guide for iOS).
Asset
iPhone 6 Plus (@3x)
iPhone 6 and iPhone 5 (@2x)
iPhone 4s (@2x)
iPad and iPad mini (@2x)
iPad 2 and iPad mini (@1x)
App icon (requiredfor all apps)
180 x 180
120 x 120
120 x 120
152 x 152
76 x 76
App icon for the App Store (requiredfor all apps)
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 (seeLaunch Images)
For iPhone 6, use a launch file (see Launch Images)
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)
Spotlight search results icon (recommended)
120 x 120
80 x 80
80 x 80
80 x 80
40 x 40
Settings icon (recommended)
87 x 87
58 x 58
58 x 58
58 x 58
29 x 29
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
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)
Default Newsstand cover icon for the App Store (requiredfor Newsstand apps)
At least 1024 pixels on the longest edge
At least 1024 pixels on the longest edge
At least 1024 pixels on the longest edge
At least 1024 pixels on the longest edge
At least 512 pixels on the longest edge
Web clip icon (recommended for web apps and websites)
180 x 180
120 x 120
120 x 120
152 x 152
76 x 76
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—that is, 8 bits each for red, green, and blue—plus an 8-bit alpha channel.
You don’t need to constrain your palette to web-safe colors.
From:https://developer.apple.com/library/ios/documentation/userexperience/conceptual/mobilehig/IconMatrix.html#//apple_ref/doc/uid/TP40006556-CH27-SW1
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