创建新应用常用的宏定义

#define kWidth [UIScreen mainScreen].bounds.size.width

#define kHeight [UIScreen mainScreen].bounds.size.height

#define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a]
#define RGB(r,g,b) RGBA(r,g,b,1.0f)
#define STAND_DEFAULT [NSUserDefaults standardUserDefaults]

#define NOTIFICATION_DEFAULT [NSNotificationCenter defaultCenter]