一、去掉mas_前缀

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
    #import <QuartzCore/QuartzCore.h>

    //define this constant if you want to use Masonry without the 'mas_' prefix
    #define MAS_SHORTHAND

    //define this constant if you want to enable auto-boxing for default syntax
    #define MAS_SHORTHAND_GLOBALS

    #import "Masonry.h"
#endif