Dark Horse programmer--"Dark Horse video Notes" The function and method of OC Language Foundation

Method

1. The object method is a minus-
2. The Declaration of the object method must be written between @interface and @end
The implementation of the object method must be written between @implementation and @end
3. Object methods can only be called by objects
4. Object method collation \ Object All

Function

1. function can be written anywhere in the file (except between @interface and @end), function is file-owned
2. Function calls do not depend on the object
3. The member variable of an object cannot be accessed directly from the member variable name within the function

   1:  #import <Foundation/Foundation.h>

   2:  

   3:  @Interface Person:nsobject

   4:  @end

   5:  

   6:  @implementation Person

   7:  @end

   8:  

   9:  @Interface Car:nsobject

  Ten:  {//member variable \ instance variable

One   :      //int wheels = 4; not allowed to initialize here

  :      //static int wheels; You cannot use member variables as variables in C language arbitrarily.

  :      @ public

  :      int wheels;

  :  }

  :  

  :  -(void) run;

  :  -(void) fly;

  :  @end

  :  

+   :  int main ()

  :  {

Max   :      //wheels = ten;

  :/      *

  :      car *c = [car new];

  :      c->wheels = 4;

  :      //run ();

  28:      

  :      [C Run];

  :      * /

  31:      

  :      void test2 ();

  33:      

  :      test2 ();

  35:      

  £ º      return 0;

  Panax Notoginseng  :}

  :  

  :  @implementation Car

Max   :  

Double   :  -(void) fly

  :  {

  43:      

  :  }

  :  

*   /  *

A   :  void test2 ()

  :  {

A   :      NSLog (@ "called the Test2 function-%d", wheels);

}*/   :  

  Wuyi:  

  :  void test ()

  :  {

Si   :      NSLog (@ "called the test Function");

  :  }

  :  

  £ º  -(void) run

The   following  :{

  :      test ();

  :      NSLog (@ "%d wheels of the car ran up", wheels);

A   :  }

+   :  @end

Dark Horse programmer--"Dark Horse video Notes" The function and method of OC Language Foundation