为了方便程序调用，我们把XMPP的一些主要方法写在AppDelegate中

在AppDelegate.m下这几个方法为：

 

-(void)setupStream{

    //初始化XMPPStream
    xmppStream = [[XMPPStream alloc] init];
    [xmppStream addDelegate:self delegateQueue:dispatch_get_current_queue()];

}

-(void)goOnline{

    //发送在线状态
    XMPPPresence *presence = [XMPPPresence presence];
    [[self xmppStream] sendElement:presence];

}

-(void)goOffline{

    //发送下线状态
    XMPPPresence *presence = [XMPPPresence presenceWithType:@"unavailable"];
    [[self xmppStream] sendElement:presence];

}

-(BOOL)connect{

    [self setupStream];

    //从本地取得用户名，密码和服务器地址
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSString *userId = [defaults stringForKey:USERID];
    NSString *pass = [defaults stringForKey:PASS];
    NSString *server = [defaults stringForKey:SERVER];

    if (![xmppStream isDisconnected]) {
        return YES;
    }

    if (userId == nil || pass == nil) {
        return NO;
    }

    //设置用户
    [xmppStream setMyJID:[XMPPJID jidWithString:userId]];
    //设置服务器
    [xmppStream setHostName:server];
    //密码
    password = pass;

    //连接服务器
    NSError *error = nil;
    if (![xmppStream connect:&error]) {
        NSLog(@"cant connect %@", server);
        return NO;
    }

    return YES;

}

-(void)disconnect{

    [self goOffline];
    [xmppStream disconnect];

}

这几个是基础方法，接下来就是XMPPStreamDelegate中的方法，也是接受好友状态，接受消息的重要方法

 

 

//连接服务器
- (void)xmppStreamDidConnect:(XMPPStream *)sender{

    isOpen = YES;
    NSError *error = nil;
    //验证密码
    [[self xmppStream] authenticateWithPassword:password error:&error];

}

//验证通过
- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender{

    [self goOnline];
}

//收到消息
- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message{

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

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

    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    [dict setObject:msg forKey:@"msg"];
    [dict setObject:from forKey:@"sender"];

    //消息委托(这个后面讲)
    [messageDelegate newMessageReceived:dict];

}

//收到好友状态
- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence{

//    NSLog(@"presence = %@", 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];

    if (![presenceFromUser isEqualToString:userId]) {

        //在线状态
        if ([presenceType isEqualToString:@"available"]) {

            //用户列表委托(后面讲)
            [chatDelegate newBuddyOnline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"nqc1338a"]];

        }else if ([presenceType isEqualToString:@"unavailable"]) {
            //用户列表委托(后面讲)
            [chatDelegate buddyWentOffline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"nqc1338a"]];
        }

    }

}

这里面有两个委托方法，一个是用户列表委托，还有一个就是消息委托，用户列表委托主要就是取得在线用户，更新用户TableView，消息委托就是取得好友发送的消息，并更新消息TableView，当然这两个TableView是在不同的Controller中的

 

定义完两个委托，我们就要在不同的Controller中实现这两个委托了

在好友Controller中实现<KKChatDelegate>并写入如下方法

 

//取得当前程序的委托
-(KKAppDelegate *)appDelegate{

    return (KKAppDelegate *)[[UIApplication sharedApplication] delegate];

}

//取得当前的XMPPStream
-(XMPPStream *)xmppStream{

    return [[self appDelegate] xmppStream];
}

//在线好友
-(void)newBuddyOnline:(NSString *)buddyName{

    if (![onlineUsers containsObject:buddyName]) {
        [onlineUsers addObject:buddyName];
        [self.tView reloadData];
    }

}

//好友下线
-(void)buddyWentOffline:(NSString *)buddyName{

    [onlineUsers removeObject:buddyName];
    [self.tView reloadData];

}

在viewDidLoad中加入

 

 

//设定在线用户委托
    KKAppDelegate *del = [self appDelegate];
    del.chatDelegate = self;

这两行代码，让好友列表的委托实现方法在本程序中

 

在viewWillAppear中加入

 

[super viewWillAppear:animated];

NSString *login = [[NSUserDefaults standardUserDefaults] objectForKey:@"userId"];

if (login) {

    if ([[self appDelegate] connect]) {
        NSLog(@"show buddy list");

    }

}else {

    //设定用户
    [self Account:self];

}

判断本地保存的数据中是否有userId，没有的话就跳转到登录页面

 

这里最重要的就是connect了，这一句话就是登录了，成功的话，页面就会显示好友列表了。

 

#pragma mark UITableViewDelegate
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    //start a Chat
    chatUserName = (NSString *)[onlineUsers objectAtIndex:indexPath.row];

    [self performSegueWithIdentifier:@"chat" sender:self];

}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{

    if ([segue.identifier isEqualToString:@"chat"]) {
        KKChatController *chatController = segue.destinationViewController;
        chatController.chatWithUser = chatUserName;
    }
}

 

当显示出好友列表，我们选择一个好友进行聊天

 

将当前好友名称发送给聊天页面

下面是聊天Controller了

在KKChatController.h中加入

 

NSMutableArray *messages;

这是我们要显示的消息，每一条消息为一条字典

 

接下来就是每一条消息的显示了

 

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    static NSString *identifier = @"msgCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier];
    }

    NSMutableDictionary *dict = [messages objectAtIndex:indexPath.row];

    cell.textLabel.text = [dict objectForKey:@"msg"];
    cell.detailTextLabel.text = [dict objectForKey:@"sender"];
    cell.accessoryType = UITableViewCellAccessoryNone;

    return cell;

}

跟上面好友Controller一样，这里我们也需要XMPPStream

 

 

-(KKAppDelegate *)appDelegate{

    return (KKAppDelegate *)[[UIApplication sharedApplication] delegate];
}

-(XMPPStream *)xmppStream{

    return [[self appDelegate] xmppStream];
}

在ViewDidLoad中加入

 

 

KKAppDelegate *del = [self appDelegate];
del.messageDelegate = self;

设定消息委托由自己来接收和处理

 

 

#pragma mark KKMessageDelegate
-(void)newMessageReceived:(NSDictionary *)messageCotent{

    [messages addObject:messageCotent];

    [self.tView reloadData];

}

接下来最重要的就是发送消息了

 

 

- (IBAction)sendButton:(id)sender {

    //本地输入框中的信息
    NSString *message = self.messageTextField.text;

    if (message.length > 0) {

        //XMPPFramework主要是通过KissXML来生成XML文件
        //生成<body>文档
        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:chatWithUser];
        //由谁发送
        [mes addAttributeWithName:@"from" stringValue:[[NSUserDefaults standardUserDefaults] stringForKey:USERID]];
        //组合
        [mes addChild:body];

        //发送消息
        [[self xmppStream] sendElement:mes];

        self.messageTextField.text = @"";
        [self.messageTextField resignFirstResponder];

        NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];

        [dictionary setObject:message forKey:@"msg"];
        [dictionary setObject:@"you" forKey:@"sender"];

        [messages addObject:dictionary];

        //重新刷新tableView
        [self.tView reloadData];

    }


}