如何判断iPhone版本

//判断iphone4

#define iPhone4 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ?CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)

//以5为标准

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

//判断iphone6

#define iPhone6 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ?CGSizeEqualToSize(CGSizeMake(750, 1334), [[UIScreen mainScreen]currentMode].size) : NO)

//判断iphone6p

#define iPhone6p ([UIScreen instancesRespondToSelector:@selector(currentMode)] ?CGSizeEqualToSize(CGSizeMake(1242, 2208), [[UIScreen mainScreen] currentMode].size) : NO)