iOS等価jsのencodeURIComponent

iOS原生法等価jsにおけるencodeURIComponent法

//           js encodeURIComponent
- (NSString *)URLEncodedString:(NSString *)str {
    NSString *encodedString = (NSString *)
    CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                              (CFStringRef)str,
                                                              NULL,
                                                              (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                              kCFStringEncodingUTF8));
    return encodedString;
}