IOS 8的Icon大小标准：
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Asset
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iPhone 6 Plus (@3x)
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iPhone 6 and iPhone 5 (@2x)
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iPhone 4s (@2x)
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iPad and iPad mini (@2x)
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iPad 2 and iPad mini (@1x)
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App icon
(requiredfor all apps)
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180 x 180
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120 x 120
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120 x 120
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152 x 152
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76 x 76
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App icon for the App Store
(requiredfor all apps)
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1024 x 1024
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1024 x 1024
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1024 x 1024
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1024 x 1024
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1024 x 1024
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Launch file or image
(requiredfor all apps)
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640 x 960
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1536 x 2048 (portrait)
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768 x 1024 (portrait)
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For iPhone 5, 640 x 1136
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2048 x 1536 (landscape)
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1024 x 768 (landscape)
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Spotlight search results icon
(recommended)
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120 x 120
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80 x 80
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80 x 80
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80 x 80
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40 x 40
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Settings icon
(recommended)
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87 x 87
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58 x 58
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58 x 58
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58 x 58
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29 x 29
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Toolbar and navigation bar icon (optional)
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About 66 x 66
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About 44 x 44
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About 44 x 44
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About 44 x 44
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About 22 x 22
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Tab bar icon
(optional)
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About 75 x 75 (maximum: 144 x 96)
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About 50 x 50 (maximum: 96 x 64)
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About 50 x 50 (maximum: 96 x 64)
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About 50 x 50 (maximum: 96 x 64)
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About 25 x 25 (maximum: 48 x 32)
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Default Newsstand cover icon for the App Store
(requiredfor Newsstand apps)
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At least 1024 pixels on the longest edge
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At least 1024 pixels on the longest edge
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At least 1024 pixels on the longest edge
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At least 1024 pixels on the longest edge
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At least 512 pixels on the longest edge
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Web clip icon
(recommended for web apps and websites)
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180 x 180
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120 x 120
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120 x 120
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152 x 152
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76 x 76
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原文：http://blog.csdn.net/dengbin9009/article/details/41596071