要连接到IDN（国际域名）网址，你需要在Punycode中对它们进行编码。例如，此网址将编码为 http：//xn--d1abbgf6aiiy.xn--p1ai 。

To connect to IDN (international domain name) URLs, you need to encode them in Punycode. For example, this URL would be encoded as http://xn--d1abbgf6aiiy.xn--p1ai.

不幸的是，我不知道iOS中有任何内置的punycode支持。但是有第三方工具，如 NSURL-IDN （摘自 OmniNetworking 库。）

Unfortunately I don't know of any built-in punycode support in iOS. But there are third-party tools like NSURL-IDN (which is extracted from the OmniNetworking library).