XMPPFrameWork IOS 开发（四）消息和好友上下线

消息

//收到消息

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message{  

//    NSLog(@"message = %@", message);

    //消息的内容

    NSString *msg = [[message elementForName:@"body"] stringValue];

    //消息发送者

    NSString *from = [[message attributeForName:@"from"] stringValue];  

    /****在此处****/

    //通知聊天页面有新消息，需要处理  

}

发送消息

//发送消息的xml格式

<message from='发送者账号'

    to='接收者账号'

    type='chat'>

	<body>HELLO WORLD </body>

	</message>

//代码组装

NSString *message = @"HELLO WORLD";

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

	[body setStringValue:message];

	//生成XML消息文档

	NSXMLElement *mes = [NSXMLElement elementWithName:@"message"];

	//消息类型

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

	//发送给谁

	[mes addAttributeWithName:@"to" stringValue:@"接受者账号"];

	//由谁发送

	[mes addAttributeWithName:@"from" stringValue:@"发送者账号"];

	//组合

	[mes addChild:body];

	//发送消息

	[[self xmppStream] sendElement:mes];

好友上下线通知

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence

{

    //取得好友状态

    NSString *presenceType = [presence type]; //online/offline

    //当前用户

    NSString *userId = [[sender myJID] user];

    //在线用户

    NSString *presenceFromUser = [[presence from] user];

	/*

	 //如果不是自己，如果涉及多段登录，此处最好加上else，如果是自己离线的话，调用上线协议

	 XMPPPresence *presence = [XMPPPresence presence];

	 [[self xmppStream] sendElement:presence];

	 */

    if (![presenceFromUser isEqualToString:userId])

	{

        //用户在线

        if ([presenceType isEqualToString:@"available"])

		{

			//列表和数据库都要相应改变

        }else if ([presenceType isEqualToString:@"unavailable"])//用户不在线

		{

			//列表和数据库都要相应改变

        }

    }

}