Respondstoselector determines whether a method is implemented

<title></title>

Tester. h

# Import<Foundation/Foundation. h>


@ Interface Tester: nsobject {

}

-(Void) Test :( nsstring*) MSG;

-(Void) Noibd;

@ End
 

Tester. m

# Import"Tester. h"

@ Implementation Tester

-(Void) Test :( nsstring*) Msg
{
Nslog (@"% @", MSG );
}

@ End
 

Note: The noibd method is not implemented.

<title></title>

Main. m

 # Import  <  Foundation  /  Foundation. h  >  
# Import  "  Tester. h  "  

  Int  Main ( Int  Argc,  Const     Char     *  Argv [])
{

NSAID utoreleasepool  *  Pool  =  [[NSAID utoreleasepool alloc] init];

Id Tester  =  [[Tester alloc] init];  //  Note that ID is used here 
  
Sel testselector  =  @ Selector (test :);
Sel notimpselector  =  @ Selector (noibd :);

  If  ([Tester respondstoselector: testselector])
{
  //  The test method is implemented in tester. M.  
  [Tester test:  @"  Invoke Test Method  " ];
}
  If  ([Tester respondstoselector: notimpselector])
{
  //  If this master is not implemented in test. m  
  [Tester noibd];
}


[Pool drain];
  Return     0  ;
}