第一次见 回调过程发生在 两行代码之间，而不是两个分离的方法，

//发送信息

-(XMPPMessage *)sendMessage:(NSString *)mess andJID:(XMPPJID *)jid

{

    

    NSXMLElement *body = [NSXMLElementelementWithName:@"body"];

    [body setStringValue:mess];

    XMPPMessage *message = [XMPPMessageelementWithName:@"message"];

    [message addAttributeWithName:@"type"stringValue:@"chat"];

    [message addAttributeWithName:@"to"stringValue:[jid full]];

    [message addAttributeWithName:@"from"stringValue:@"wangyanan@127.0.0.1"];

    

    NSXMLElement * receiptRequest = [NSXMLElement elementWithName:@"request"];

    [receiptRequest addAttributeWithName:@"xmlns"stringValue:@"urn:xmpp:receipts"];

    int timeStamp = (int)[[NSDate date] timeIntervalSince1970];

    NSString * messageID = [NSString stringWithFormat:@"%@%d%@",[[message attributeForName:@"from"]stringValue],timeStamp,[[message attributeForName:@"to"]stringValue]];

    [message addAttributeWithName:@"id"stringValue:messageID];

    [message addChild:receiptRequest];

    [message addChild:body];

    TTLog(@"xmppmessage :%@",message);

    

    XMPPElementReceipt *receipt = [XMPPElementReceiptnew];

    [mStream sendElement:message andGetReceipt:&receipt];

    BOOL messageState =[receipt wait:-1];

    if (messageState)

    {

        TTLog(@"was sent");

    }

    else{

        TTLog(@"sent faild");

    }

    return message;

}