IOS部分部件大小

iPhone 3 resolution:163ppi
iPhone 4 resolution:326ppi
iPad resolution:132ppi
iPad retina resolution:264ppi

iPhone screen:320pts * 480pts

iOS App launch images
iPhone 3G/3GS:320px *480px
iPhone 4G/4GS:640px * 960px
iPad:1024 * 768px
iPad retina:2048px * 1536px

iOS App图标尺寸及其圆角半径
iTunes Artwork icon:512px — 89.825(90)px
App icon(iPhone 3G/3GS):57px — 10px
App icon(iPhone 4G/4GS):114px — 20px
App icon(iPad):72px — 12.632(12)px
App icon(ipad):144px — 25.263(20)px
Settings icon icon(iPhone 3G/3GS/iPad):29px — 5.088(5)px
Settings icon icon(iPhone 4G/4GS):58px — 10.175(10)px

其它
Status bar height: 20px(40px)
Navigation bar height:44px(88px)
Navigation bar icons:20px * 20px(40px * 40px)
Tab bar height:49px(98px)
Tab bar icons:29px * 29px(58px * 58px)
Bar button item height:30px(60px)
Portrait Keyboard height:216px
Landscape Keyboard height:162px