The static of IOS

• The static variable in the function body is scoped to the function body, allocated only once in memory, and the last value is maintained the next time it is called.
• Static global variables within a module can be accessed by all functions within the module, but not by other functions outside the module.
• The static function within the module can only be called by other functions within this module.
• The static member variable in the class is owned by the entire class and has only one copy of the object for the class.
• The static member function in the class belongs to the entire class, does not accept the this pointer, and only accesses the static member variable of the class.

The static of IOS