什么是“@ private”平均值在Objective-C？ [英] What does "@private" mean in Objective-C?

问题描述

@private 是什么意思在Objective-C？

What does @private mean in Objective-C?

推荐答案

它是一个可见性修饰符 -it意味着声明为 @private 的实例变量只能通过同一个类的实例。

It's a visibility modifier—it means that instance variables declared as @private can only be accessed by instances of the same class. Private members cannot be accessed by subclasses or other classes.

例如：

@interface MyClass : NSObject
{
    @private
    int someVar;  // Can only be accessed by instances of MyClass

    @public
    int aPublicVar;  // Can be accessed by any object
}
@end

为了澄清，方法在Objective-C中总是公开的。有很多方法可以隐藏方法声明，但是请参阅此问题了解更多信息。

Also, to clarify, methods are always public in Objective-C. There are ways of "hiding" method declarations, though—see this question for more information.

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