NSString+URLEncoding

NSString+URLEncoding.h

#import <Foundation/Foundation.h>

@interface NSString (URLEncoding)

- (NSString *)urlEncodedString;
- (NSString *)stringByDecodingURLFormat;

@end

NSString+URLEncoding.m

#import "NSString+URLEncoding.h"

static NSString * const kCharactersToLeaveUnescaped = @"!*'\"();:@&=+$,/?%#[]% ";

@implementation NSString (URLEncoding)

- (NSString *)urlEncodedString
{
	return (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL,(CFStringRef)self,NULL,(CFStringRef)kCharactersToLeaveUnescaped,CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding)));
}

- (NSString *)stringByDecodingURLFormat
{
    NSString *result = [(NSString *)self stringByReplacingOccurrencesOfString:@"+" withString:@" "];
    result = [result stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    return result;
}

@end