仅适用于类及其子类的属性 [英] Properties for Class and Its Subclasses Only

问题描述

是否可以定义仅对定义它们的类和该类的子类可用的属性?

Is it possible to define properties that are only available to the class they are defined in, and that class's subclasses?

用另一种方式表示，有没有一种方法来定义受保护的属性?

Stated another way, is there a way to define protected properties?

推荐答案

从技术上讲，没有.属性实际上只是方法，所有方法都是公共的.我们在Objective-C中保护"方法的方法是不让其他人知道它们.

Technically, no. Properties are really just methods, and all methods are public. The way we "protect" methods in Objective-C is by not letting other people know about them.

实际上，是的.您可以在类扩展中定义属性，并仍在主实现块中@synthesize.

Practically, yes. You can define the properties in a class extension, and still @synthesize them in your main implementation block.

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