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/ Published in: Objective C
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  1. #import <Cocoa/Cocoa.h>
  2. @interface NSString (Utilities)
  3. - (BOOL) isURL;
  4. @end
  5.  
  6. #import "NSString-Utilities.h"
  7. @implementation NSString (Utilities)
  8.  
  9. - (BOOL) isURL {
  10.     if ( [self hasPrefix:@"http://"] )
  11.         return YES;
  12.     else
  13.         return NO;
  14. }
  15. @end
  16.  
  17. // To use this:
  18.  
  19. NSString* string1 = @"http://pixar.com/";
  20. NSString* string2 = @"Pixar";
  21.  
  22. if ( [string1 isURL] )
  23.     NSLog (@"string1 is a URL");
  24.  
  25. if ( [string2 isURL] )
  26.     NSLog (@"string2 is a URL");

URL: http://www.cocoadevcentral.com/d/learn_objectivec/

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