ios8 icons 和 launchImage的尺寸

https://developer.apple.com/library/ios/qa/qa1686/_index.html

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 on devices with retina display	Do not include	Optional but recommended
120x120	[email protected]	Home screen on iPhone/iPod Touch with retina display	Required	Required
180x180	[email protected]	Home screen on iPhone 6 Plus	Optional but recommended	Optional but recommended
76x76	Icon-76.png	Home screen on iPad	Optional but recommended	Optional but recommended
152x152	[email protected]	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	[email protected]	Spotlight on devices with retina display	Optional but recommended	Optional but recommended
120x120	[email protected]	Spotlight on iPhone 6 Plus	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	[email protected]	Settings on devices with retina display	Recommended if you have a Settings bundle, optional otherwise	Recommended if you have a Settings bundle, optional otherwise
87x87	[email protected]	Settings on iPhone 6 Plus	Recommended if you have a Settings bundle, optional otherwise	Recommended if you have a Settings bundle, optional otherwise

https://developer.apple.com/library/ios/documentation/userexperience/conceptual/mobilehig/LaunchImages.html

launchImage 

For iPhone 6:

• 750 x 1334 (@2x) for portrait

• 1334 x 750 (@2x) for landscape

For iPhone 6 Plus:

• 1242 x 2208 (@3x) for portrait

• 2208 x 1242 (@3x) for landscape