More on Variables and Data Types(Chapter 10 of Programming in Objective-C 2.0)

原文链接：https://www.geek-share.com/detail/2498405600.html 　　You can put four directives in front of your instance variables when they are declared in the interface section, to more precisely control their scope:　　@protected—Methods defined in the class and any subclasses can directly access the instance variables that follow.This is the default case.　　@private—Methods defined in the class can directly access the instance variables that follow, but subclasses cannot.　　@public—Methods defined in the class and any other classes or modules can directly access the instance variables that follow.　　@package—For 64-bit images, the instance variable can be accessed anywhere within the image that implements the class.

 

转载于:https://www.cnblogs.com/zhtf2014/archive/2010/10/18/1854907.html