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通过拖线的方式，将控件属性放到.m文件的@interface中的变量声明和方法声明中有什么不同呢，为什么放到变量申明的时候不能通过self.去访问？如图中3位置中只能访问2位置而不能访问1位置中的声明。
ringa_lee
self. is calling the setter and getter methods. You only declared the variable at position 1 and did not write the setter and getter methods for the property.
@interface MyClass (Category) -(Abc*) testFunc; @end
Those with words in the brackets are declaring a Catetory for a class
@interface MyClass () -(Abc*) testExtension; @end
The blank words in the brackets are extension, and inside are the private variables and methods of this class
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
self. is calling the setter and getter methods. You only declared the variable at position 1 and did not write the setter and getter methods for the property.
Those with words in the brackets are declaring a Catetory for a class
The blank words in the brackets are extension, and inside are the private variables and methods of this class