接上一章的，这一章我们着重介绍XMPP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]; } }
上面都加了注释，大家应该能明白，接下来还有一个章节，我们会对发送的消息在界面进行美化，跟苹果自带的消息一样。谢谢大家有耐心看完，我这个人比较不喜欢打字，所以有的地方注释比较少，希望大家别介意，还有希望大家能够多多支持， 以后会接着介绍XMPP文件传输之类的内容。
转载于:https://www.cnblogs.com/luqinbin/p/5016900.html
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