Escape NSString so that it can be passed to webview

gistfile1.txt

- (NSString *)stringByEscapingJSONReservedCharacters {
    return [[[[[[[[self stringByReplacingOccurrencesOfString:@"\\\\" withString:@"☃"]       /* \\ (single slash character) for snowman */
                        stringByReplacingOccurrencesOfString:@"\\n" withString:@"\\\\n"]    /* \n for \\n */
                        stringByReplacingOccurrencesOfString:@"\\t" withString:@"\\\\t"]    /* \t for \\t */
                        stringByReplacingOccurrencesOfString:@"\\b" withString:@"\\\\b"]    /* \b for \\b */
                        stringByReplacingOccurrencesOfString:@"\\f" withString:@"\\\\f"]    /* \f for \\f */
                        stringByReplacingOccurrencesOfString:@"\\r" withString:@"\\\\r"]    /* \r for \\r */
                        stringByReplacingOccurrencesOfString:@"\\\"" withString:@"\\\\\""]  /* \" for \\" */
                        stringByReplacingOccurrencesOfString:@"☃" withString:@"\\\\\\\\"];  /* snowman for \\\\ (single slash character) */
}