Iphone 八进制转义序列超出范围

我目前正试图绕过代理，但编译器给了我一条警告消息 “八进制转义序列超出范围”

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如何删除此警告？

如果“\”只是您的用户凭据的一部分，您需要将其转义：

NSURLCredential *credential = [NSURLCredential credentialWithUser:@"asdfg\\123456"
                                                             password:@"Zxcvb123!" persistence:NSURLCredentialPersistenceForSession];

问题是用户名中的\（反斜杠）。\是转义字符，当用作\121时，它将121解释为八进制数。如果您想在用户名中输入n实际值\则应将其写入

NSURLCredential *credential = [NSURLCredential credentialWithUser:@"asdfg\\123456"
                                               password:@"Zxcvb123!"
                                               persistence:NSURLCredentialPersistenceForSession] ;

NSURLCredential *credential = [NSURLCredential credentialWithUser:@"asdfg\\123456"
                                               password:@"Zxcvb123!"
                                               persistence:NSURLCredentialPersistenceForSession] ;