Ios libmailcore:无法连接到我的gmail帐户

试图遵循：

它起作用了

-(void) testGet{

      CTCoreAccount *account = [[CTCoreAccount alloc] init];
      BOOL success = [account connectToServer:@"imap.gmail.com"
                                   port:993
                         connectionType:CTConnectionTypePlain
                               authType:CTImapAuthTypePlain
                                  login:@"........"
                               password:@"......."];
if(success){
    NSLog(@"%s","SUCESS GET");
}else{
    NSLog(@"%s","FAILED GET");
}
}

它不起作用

我的错在哪里

#define GMAIL_SERVER        @"imap.gmail.com"
#define GMAIL_PORT              993
#define GMAIL_CONNECTION_TYPE   CONNECTION_TYPE_TLS
#define GMAIL_AUTH_TYPE         IMAP_AUTH_TYPE_PLAIN

CTCoreAccount *account = [[CTCoreAccount alloc] init];
BOOL success = [account connectToServer:GMAIL_SERVER
                                   port:GMAIL_PORT
                         connectionType:GMAIL_CONNECTION_TYPE
                               authType:GMAIL_AUTH_TYPE

它对我有用

#define GMAIL_SERVER        @"imap.gmail.com"
#define GMAIL_PORT              993
#define GMAIL_CONNECTION_TYPE   CONNECTION_TYPE_TLS
#define GMAIL_AUTH_TYPE         IMAP_AUTH_TYPE_PLAIN

CTCoreAccount *account = [[CTCoreAccount alloc] init];
BOOL success = [account connectToServer:GMAIL_SERVER
                                   port:GMAIL_PORT
                         connectionType:GMAIL_CONNECTION_TYPE
                               authType:GMAIL_AUTH_TYPE