Percent encoding URIs

gistfile1.m

// header

@interface NSString (EncodingExtension)
- (NSString *)stringByAddingPercentEscapesProperly;
@end

// implementation

#define URI_RESERVED_CHARACTERS  	@"!*'\"();:@&=+$,/?%#[]% "

@implementation NSString (EncodingExtension)

- (NSString *)stringByAddingPercentEscapesProperly
{
  return (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(NULL, (CFStringRef)self, NULL, (CFStringRef)URI_RESERVED_CHARACTERS, kCFStringEncodingUTF8));
}

@end