.h ---------------
.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");