ios - How XCode knows about name of function at compile time? -


I have written simple code to practice selector in the objective code, which is working fine Is 

  NSMutableArray * array = [NSMutableArray arrayWithObjects: @ "A", @ "b", zero]; NSLog (array before joining @ @% @); SEL message = @Selector (addObject :); // I will change this line if ([AR gives feedback: Troubleshooting: message]) {[ARAC displayer: with message Object: @ "c"];} NSLog (@ "% @ after adding", array);   
 But as soon as I change the selector to line,  < XCode starts issuing warning:  >  SEL message = @selector (addobject :); // just rename the selector's name  
  undeclared selector 'A Now, the question is, how does XCode compile the name of the name about the time is correct or does not always generate the list of the selector internally, whatever I made.  Codex> NSMutableArray    
 
 
 All Xcode knows that someone Not a class, in system code or in your program, which declares a selector named  addobject , you can prove it by creating a custom class Which declares a  addobject  method, and warnings must be removed, but the program will definitely crash with an unrecognized selector sent to the  object  error message.

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