宏定义判断设备是否是iphone5

宏定义代码：

#define iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)

使用：

if (iPhone5) {    sentences...}else {    sentences...}