Member Variable scope: OC

2. There are four kinds;
4. A public scope means that member variables can be accessed everywhere;
6. A private scope can only be accessed directly from the object methods of the current class, such as PERSON.M; if the subclass needs access, it needs to pass the set and get methods;
8. Protection scopes can be accessed directly in the object methods of the current class and subclass;
10. The private variables of the parent class cannot be accessed directly in the subclass, but there are private variables that need to be accessed through the set and get methods;
14. Do not write anything, the default is protected;
16. @public: The member variables of an object can be accessed directly from anywhere
18. @private: can only be accessed directly in the object method of the current class;
20. @protected: can be accessed directly in the object method of the Money class and subclass (default is @protected)
22. @package: The member variables of an object can be accessed directly in the same frame;
24. The member variable in the. h file is protected by default, and the member variable in. m is private by default, even if it is written as @public; The subclass is also private. The member variable name declared in the. m file cannot be the same as the one in the. h file, unless it is placed in the. main file for direct access;
26. Super class is the parent class superclass

Member Variable scope: OC