iOS 不同屏幕的分辨率及判断尺寸的宏

/**
*  1 判断是否为3.5inch      320*480
*/
#define ONESCREEN ([UIScreen mainScreen].bounds.size.height == 480)
/**
*  2 判断是否为4inch        640*1136
*/
#define TWOSCREEN ([UIScreen mainScreen].bounds.size.height == 568)
/**
*  3 判断是否为4.7inch   375*667   750*1334
*/
#define THREESCREEN ([UIScreen mainScreen].bounds.size.height == 667)
/**
*  4 判断是否为5.5inch   414*1104   1242*2208
*/
#define FOURSCREEN ([UIScreen mainScreen].bounds.size.height == 1104)