category

.h ---------------

#import <Cocoa/Cocoa.h> @interface NSString (Utilities) - (BOOL) isURL; @end

.m -----------------

#import "NSString-Utilities.h" @implementation NSString (Utilities) - (BOOL) isURL { if ( [self hasPrefix:@"http://"] ) return YES; else return NO; } @end

usese -----------------

NSString* string1 = @"http://pixar.com/"; NSString* string2 = @"Pixar"; if ( [string1 isURL] ) NSLog (@"string1 is a URL"); if ( [string2 isURL] ) NSLog (@"string2 is a URL");