iPhone适配
//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(640,1136), [[UIScreen mainScreen] currentMode].size) || CGSizeEqualToSize(CGSizeMake(750,1334), [[UIScreen mainScreen] currentMode].size)) : NO)
//判断iphone6p
#define iPhone6plus ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? (CGSizeEqualToSize(CGSizeMake(1125,2001), [[UIScreen mainScreen] currentMode].size) || CGSizeEqualToSize(CGSizeMake(1242,2208), [[UIScreen mainScreen] currentMode].size)) : NO)