接口实现中的静态变量是什么意思? [英] What's the meaning of static variables in an implementation of an interface?

问题描述

在接口的实现中定义时，我不太了解静态变量.在方法中，我确实了解它们与局部变量的区别，但在直接在实现中定义时却没有.

I don't quite understand static variables when defined in the implementation of an interface. In methods I do understand how they differ from local variables, but not when defined directly in an implementation.

看看这些例子.这两者实际上有什么区别?

Look at these examples. What difference do these two make practically?

#include "MyClass.h"

@implementation MyClass
int myInt;
...
@end

并且:

#include "MyClass.h"

@implementation MyClass
static int myInt;
...
@end

在所有情况下，

myInt在所有方法中都是可见的，并且如果我解释了我正确运行的测试，则对于两种不同的类实例，myInt在这两种情况下都是相同的变量.

myInt is in both cases visible to all the methods, and if I interpreted a test I ran correctly, myInt will in both cases be the same variable for different instances of the class.

推荐答案

该上下文中的'static'关键字与纯C中的关键字相同:它将myInt的范围限制为当前文件.

The 'static' keyword in that context is the same as it would be in plain C: it limits the scope of myInt to the current file.

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