从外部类访问私有变量

从外部类访问私有变量 - iOS(Accessing private variables from an external class - iOS)

我在一个类中有一个私有变量，我试图从外部类访问该变量。 有没有办法做到这一点？

I have a private variable in a class and I am trying to access that variable from an external class. Is there a way I could do this?

最满意答案

根据定义，私有实例变量是私有的。 你不能在外部访问它们。 如果您是该类的作者，则应该为该变量提供访问器方法。 如果你不是，你应该避免访问变量。

但是，有办法规避这种限制。

您可以在第一个类上创建一个类别，并为该实例变量添加一个访问器方法。

或者你可以使用键值编码来访问变量。

[object valueForKey:@"variable_name"];

The private instance variables are, by definition, private. You cannot access them externally. If you are the author of the class, you should provide accessor methods for the variable. If you're not, you should refrain from accessing the variable.

However, there are ways to circumvent that limitation.

You may create a category on the first class and add an accessor method for the instance variable.

Or your may use Key-Value Coding to access the variable.

[object valueForKey:@"variable_name"];