ios应用图标尺寸要求

参考官方文档“https://developer.apple.com/library/ios/qa/qa1686/_index.html”

注意，需要在Info.plist文件中添加icon到“Icon files”中才生效，测试环境Xcode6.1，ios8

512x512	iTunesArtwork	App list in iTunes
1024x1024	iTunesArtwork@2x	App list in iTunes on devices with retina display
120x120	Icon-60@2x.png	Home screen on iPhone/iPod Touch with retina display
180x180	Icon-60@3x.png	Home screen on iPhone 6 Plus
76x76	Icon-76.png	Home screen on iPad
152x152	Icon-76@2x.png	Home screen on iPad with retina display
40x40	Icon-Small-40.png	Spotlight
80x80	Icon-Small-40@2x.png	Spotlight on devices with retina display
120x120	Icon-Small-40@3x.png	Spotlight on iPhone 6 Plus
29x29	Icon-Small.png	Settings
58x58	Icon-Small@2x.png	Settings on devices with retina display
87x87	Icon-Small@3x.png	Settings on iPhone 6 Plus