iOS项目中所有icon的尺寸以及命名

一般icon以下几个：

Icon.png – 57×57 iPhone (ios5/6)
Icon@2x.png – 114×114 iPhone Retina (ios5/6)
Icon-72.png – 72×72 iPad (ios5/6)
Icon-72@2x.png  - 144×144 iPad Retina (ios5/6)
Icon-60@2x.png  - 120x120 iphone & ipod touch (ios7/8)
Icon-60@3x.png - 180x180 iphone6 plus (ios8)
Icon-76.png - 76x76 ipad2 & ipad mini (ios7/8)
Icon-76@2x.png - 152x152 ipad retina (ios7/8) 

以下不区分iPhone或者iPad。可见，在iOS6.1以及之前的iOS版本中，iPad的和iPhone使用者完全区别的图标。但是iOS7以及以后，两者不再有区分。

iOS7到iOS8以前需要的icon尺寸以及名称

Image Size (px)	File Name	Used For	App Store	Ad Hoc
512x512	iTunesArtwork	App list in iTunes	Do not include	Optional but recommended
1024x1024	iTunesArtwork@2x	App list in iTunes for devices with retina display	Do not include	Optional but recommended
120x120	Icon-60@2x.png	Home screen on iPhone/iPod Touch with retina display	Required	Required
76x76	Icon-76.png	Home screen on iPad	Required	Required
152x152	Icon-76@2x.png	Home screen on iPad with retina display	Optional but recommended	Optional but recommended
40x40	Icon-Small-40.png	Spotlight	Optional but recommended	Optional but recommended
80x80	Icon-Small-40@2x.png	Spotlight on devices with retina display	Optional but recommended	Optional but recommended
29x29	Icon-Small.png	Settings	Recommended if you have a Settings bundle, optional otherwise	Recommended if you have a Settings bundle, optional otherwise
58x58	Icon-Small@2x.png	Settings on devices with retina display	Recommended if you have a Settings bundle, optional otherwise	Recommended if you have a Settings bundle, optional otherwise

iOS6.1及之前版本icon尺寸及其名称

Image Size (px)	File Name	Used For	App Store	Ad Hoc
57x57	Icon.png	Home screen on iPhone/iPod touch (iOS 6.1 and earlier)	Required	Required
114x114	Icon@2x.png	Home screen on iPhone/iPod Touch with retina display (iOS 6.1 and earlier)	Optional but recommended	Optional but recommended
72x72	Icon-72.png	Home screen on iPad (iOS 6.1 and earlier)	Required	Required
144x144	Icon-72@2x.png	Home screen on iPad with retina display (iOS 6.1 and earlier)	Optional but recommended	Optional but recommended
29x29	Icon-Small.png	Spotlight on iPhone/iPod Touch (iOS 6.1 and earlier) and Settings	Recommended if you have a Settings bundle, otherwise optional but recommended	Recommended if you have a Settings bundle, otherwise optional but recommended
58x58	Icon-Small@2x.png	Spotlight on iPhone/iPod Touch with retina display (iOS 6.1 and earlier) and Settings on devices with retina display	Recommended if you have a Settings bundle, otherwise optional but recommended	Recommended if you have a Settings bundle, otherwise optional but recommended
50x50	Icon-Small-50.png	Spotlight on iPad (iOS 6.1 and earlier)	Optional but recommended	Optional but recommended
100x100	Icon-Small-50@2x.png	Spotlight on iPad with retina display (iOS 6.1 and earlier)	Optional but recommended	Optional but recommended