iOS——字體，顏色，常量等適配機型

#define iPhone4S (HKHeight < 568.0)

#define iPhone5 (HKHeight == 568.0)

#define iPhone6 (HKHeight == 667.0)

#define iPhone6PLUS (HKHeight == 736.0)

#define HKGenericFont (iPhone5? DEFAULT_FONT(16) : (iPhone6? DEFAULT_FONT(16) : DEFAULT_FONT(17)))