Extension Extension (18)

Extension extension

The extension extension is used to manage private methods, and instance variables used within the class. Also, instance variables and private methods defined in the extension can only be used in this class. Define extensions in the implementation file.

PERSON.M file

#import "Person.h" Extended extension To manage private methods and instance variables used inside the class @interface person () { Extensions can define instance variables, but category cannot. An instance variable defined in an extension that can only be used in this class NSString *_name; } Declaring Private methods Private methods can only be used within a class -(void) p_sayhi; @end @implementation person -(void) p_sayhi{ NSLog (@ "Hello"); } @end

Extension Extension (18)