适配iOS 7 和iOS 8屏幕尺寸宏定义

#define IS_IOS8_0 ([[[UIDevice currentDevice] systemVersion] floatValue] < 8.0)

#define WIDTH          [UIScreen mainScreen].bounds.size.width

#define HEIGHT           [UIScreen mainScreen].bounds.size.height

#define SCREEN_WIDTH        (IS_IOS8_0 ? HEIGHT : WIDTH)

#define SCREEN_HEIGHT       (IS_IOS8_0 ? WIDTH : HEIGHT)

适配iOS 7 和iOS 8屏幕尺寸宏定义

原文：http://www.cnblogs.com/marysneaker/p/5630680.html