根据画面尺寸判断各机型的尺寸
# define is _ iphone (ui _ user _ interface _ idiom (==uiuserinterfaceidiomphone ) define _ _ kscreenheight ([ ] efired bounds ).size.width ] # define screen _max _ length ) _ max ) __kidth __kScreenHeight ) # define screen _ min _ min _ _ kscreenheight (# define is _ iphone _4_ or _ less (is _ iphone screen _ max _ length 568.0 ) # define is _ iphone