一般情況下針對于URL轉(zhuǎn)碼：

[url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]

但是對于含有特殊字符的就需要字符集轉(zhuǎn)碼：

url = [url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:@"#%<>[\\]^`{|}\"]+"].invertedSet];