NSString+URLEncoding

NSString+URLEncoding.h

#import <Foundation/Foundation.h>

@interface NSString(URLEncoding)

- (NSString *)urlEncodeString;

@end

NSString+URLEncoding.m

#import "NSString+URLEncoding.h"

@implementation NSString(URLEncoding)
- (NSString *)urlEncodeString
{
    NSString *result = (NSString *)CFURLCreateStringByAddingPercentEscapes(NULL, 
                (CFStringRef)self, 
                NULL, 
                (CFStringRef)@";/?:@&=$+{}<>,",
                kCFStringEncodingUTF8);
    return [result autorelease];
}
@end