XMPPFramework是一個OS X/iOS平台的開源項目，使用Objective-C實現了XMPP協議（RFC-3920），同時還提供了用於讀寫XML的工具，大大簡化了基於XMPP的通信應用的開發。

1. 登錄和好友上下線

1.1XMPP中常用對象們

• XMPPStream：xmpp基礎服務類
• XMPPRoster：好友列表類
• XMPPRosterCoreDataStorage：好友列表（用戶賬號）在core data中的操作類
• XMPPvCardCoreDataStorage：好友名片（昵稱，簽名，性別，年齡等信息）在core data中的操作類
• XMPPvCardTemp：好友名片實體類，從數據庫裡取出來的都是它
• xmppvCardAvatarModule：好友頭像
• XMPPReconnect：如果失去連接,自動重連
• XMPPRoom：提供多用戶聊天支持
• XMPPPubSub：發布訂閱

1.2登錄操作，也就是連接xmpp服務器

- (void)connect {
  if (self.xmppStream == nil) {
    self.xmppStream = [[XMPPStream alloc] init];
    [self.xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()];
  }
  if (![self.xmppStream isConnected]) {
    NSString *username = [[NSUserDefaults standardUserDefaults] objectForKey:@"username"];
    XMPPJID *jid = [XMPPJID jidWithUser:username domain:@"lizhen" resource:@"Ework"];
    [self.xmppStream setMyJID:jid];
    [self.xmppStream setHostName:@"10.4.125.113"];
    NSError *error = nil;
    if (![self.xmppStream connect:&error]) {
      NSLog(@"Connect Error: %@", [[error userInfo] description]);
    }
  }
}

connect成功之後會依次調用XMPPStreamDelegate的方法，首先調用

- (void)xmppStream:(XMPPStream *)sender socketDidConnect:(GCDAsyncSocket *)socket

然後

- (void)xmppStreamDidConnect:(XMPPStream *)sender

在該方法下面需要使用xmppStream 的authenticateWithPassword方法進行密碼驗證，成功的話會響應delegate的方法，就是下面這個

- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender

1.3上線

實現 - (void)xmppStreamDidAuthenticate:(XMPPStream *)sender 委托方法

- (void)xmppStreamDidAuthenticate:(XMPPStream *)sender {
  XMPPPresence *presence = [XMPPPresence presenceWithType:@"available"];
  [self.xmppStream sendElement:presence];
}

1.4退出並斷開連接

- (void)disconnect {
  XMPPPresence *presence = [XMPPPresence presenceWithType:@"unavailable"];
  [self.xmppStream sendElement:presence];
   
  [self.xmppStream disconnect];
}

1.5好友狀態

獲取好友狀態，通過實現

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

方法，當接收到 presence 標簽的內容時，XMPPFramework 框架回調該方法

一個 presence 標簽的格式一般如下：

presence 的狀態：

• available 上線
• away 離開
• do not disturb 忙碌
• unavailable 下線

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence {
  NSString *presenceType = [presence type];
  NSString *presenceFromUser = [[presence from] user];
  if (![presenceFromUser isEqualToString:[[sender myJID] user]]) {
    if ([presenceType isEqualToString:@"available"]) {
      //
    } else if ([presenceType isEqualToString:@"unavailable"]) {
      //
    }
  }
}

2. 接收消息和發送消息

2.1接收消息

當接收到 message 標簽的內容時，XMPPFramework 框架回調該方法

根據 XMPP 協議，消息體的內容存儲在標簽 body 內

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message {
  NSString *messageBody = [[message elementForName:@"body"] stringValue];
}

2.2發送消息
發送消息，我們需要根據 XMPP 協議，將數據放到標簽內，例如：

- (void)sendMessage:(NSString *) message toUser:(NSString *) user {
  NSXMLElement *body = [NSXMLElement elementWithName:@"body"];
  [body setStringValue:message];
  NSXMLElement *message = [NSXMLElement elementWithName:@"message"];
  [message addAttributeWithName:@"type" stringValue:@"chat"];
  NSString *to = [NSString stringWithFormat:@"%@@example.com", user];
  [message addAttributeWithName:@"to" stringValue:to];
  [message addChild:body];
  [self.xmppStream sendElement:message];
}

3. 獲取好友信息和刪除好友

3.1好友列表和好友名片

[_xmppRoster fetchRoster];//獲取好友列表
//獲取到一個好友節點
- (void)xmppRoster:(XMPPRoster *)sender didRecieveRosterItem:(NSXMLElement *)item
//獲取完好友列表
- (void)xmppRosterDidEndPopulating:(XMPPRoster *)sender
//到服務器上請求聯系人名片信息
- (void)fetchvCardTempForJID:(XMPPJID *)jid;
//請求聯系人的名片，如果數據庫有就不請求，沒有就發送名片請求
- (void)fetchvCardTempForJID:(XMPPJID *)jid ignoreStorage:(BOOL)ignoreStorage;
//獲取聯系人的名片，如果數據庫有就返回，沒有返回空，並到服務器上抓取
- (XMPPvCardTemp *)vCardTempForJID:(XMPPJID *)jid shouldFetch:(BOOL)shouldFetch;
//更新自己的名片信息
- (void)updateMyvCardTemp:(XMPPvCardTemp *)vCardTemp;
//獲取到一盒聯系人的名片信息的回調
- (void)xmppvCardTempModule:(XMPPvCardTempModule *)vCardTempModule 
    didReceivevCardTemp:(XMPPvCardTemp *)vCardTemp 
           forJID:(XMPPJID *)jid

3.2添加好友

 //name為用戶賬號
  - (void)XMPPAddFriendSubscribe:(NSString *)name
  {
    //XMPPHOST 就是服務器名， 主機名
    XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@%@",name,XMPPHOST]];
    //[presence addAttributeWithName:@"subscription" stringValue:@"好友"];
    [xmppRoster subscribePresenceToUser:jid];
     
  }

3.3收到添加好友的請求

 - (void)xmppRoster:(XMPPRoster *)sender didReceivePresenceSubscriptionRequest:(XMPPPresence *)presence
  {
    //取得好友狀態
    NSString *presenceType = [NSString stringWithFormat:@"%@", [presence type]]; //online/offline
    //請求的用戶
    NSString *presenceFromUser =[NSString stringWithFormat:@"%@", [[presence from] user]];
    NSLog(@"presenceType:%@",presenceType);
     
    NSLog(@"presence2:%@ sender2:%@",presence,sender);
     
    XMPPJID *jid = [XMPPJID jidWithString:presenceFromUser];
    //接收添加好友請求
    [xmppRoster acceptPresenceSubscriptionRequestFrom:jid andAddToRoster:YES];
     
  }

3.4刪除好友

//刪除好友，name為好友賬號
- (void)removeBuddy:(NSString *)name 
{ 
  XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@%@",name,XMPPHOST]]; 
    
  [self xmppRoster] removeUser:jid]; 
}

4. 聊天室

初始化聊天室

XMPPJID *roomJID = [XMPPJID jidWithString:ROOM_JID];
   
  xmppRoom = [[XMPPRoom alloc] initWithRoomStorage:self jid:roomJID];
   
  [xmppRoom activate:xmppStream];
  [xmppRoom addDelegate:self delegateQueue:dispatch_get_main_queue()];

創建聊天室成功

- (void)xmppRoomDidCreate:(XMPPRoom *)sender
  {
    DDLogInfo(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

加入聊天室，使用昵稱

 [xmppRoom joinRoomUsingNickname:@"quack" history:nil];

獲取聊天室信息

  - (void)xmppRoomDidJoin:(XMPPRoom *)sender
  {
    [xmppRoom fetchConfigurationForm];
    [xmppRoom fetchBanList];
    [xmppRoom fetchMembersList];
    [xmppRoom fetchModeratorsList];
  }

如果房間存在，會調用委托

 // 收到禁止名單列表
  - (void)xmppRoom:(XMPPRoom *)sender didFetchBanList:(NSArray *)items;
  // 收到好友名單列表
  - (void)xmppRoom:(XMPPRoom *)sender didFetchMembersList:(NSArray *)items;
  // 收到主持人名單列表
  - (void)xmppRoom:(XMPPRoom *)sender didFetchModeratorsList:(NSArray *)items;

房間不存在，調用委托

 - (void)xmppRoom:(XMPPRoom *)sender didNotFetchBanList:(XMPPIQ *)iqError;
  - (void)xmppRoom:(XMPPRoom *)sender didNotFetchMembersList:(XMPPIQ *)iqError;
  - (void)xmppRoom:(XMPPRoom *)sender didNotFetchModeratorsList:(XMPPIQ *)iqError;

離開房間

[xmppRoom deactivate:xmppStream];

XMPPRoomDelegate的其他代理方法:

離開聊天室

 - (void)xmppRoomDidLeave:(XMPPRoom *)sender
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

新人加入群聊

 - (void)xmppRoom:(XMPPRoom *)sender occupantDidJoin:(XMPPJID *)occupantJID
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

有人退出群聊

 - (void)xmppRoom:(XMPPRoom *)sender occupantDidLeave:(XMPPJID *)occupantJID
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

有人在群裡發言

 - (void)xmppRoom:(XMPPRoom *)sender didReceiveMessage:(XMPPMessage *)message fromOccupant:(XMPPJID *)occupantJID
  {
    DDLogVerbose(@"%@: %@", THIS_FILE, THIS_METHOD);
  }

5. 消息回執

這個是XEP－0184協議的內容。協議內容：

發送消息時附加回執請求

代碼實現

NSString *siID = [XMPPStream generateUUID];
  //發送消息
  XMPPMessage *message = [XMPPMessage messageWithType:@"chat" to:jid elementID:siID];
  NSXMLElement *receipt = [NSXMLElement elementWithName:@"request" xmlns:@"urn:xmpp:receipts"];
  [message addChild:receipt];
  [message addBody:@"測試"];
  [self.xmppStream sendElement:message];

收到回執請求的消息，發送回執

代碼實現

 - (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message
  {
    //回執判斷
    NSXMLElement *request = [message elementForName:@"request"];
    if (request)
    {
      if ([request.xmlns isEqualToString:@"urn:xmpp:receipts"])//消息回執
      {
        //組裝消息回執
        XMPPMessage *msg = [XMPPMessage messageWithType:[message attributeStringValueForName:@"type"] to:message.from elementID:[message attributeStringValueForName:@"id"]];
        NSXMLElement *recieved = [NSXMLElement elementWithName:@"received" xmlns:@"urn:xmpp:receipts"];
        [msg addChild:recieved];
         
        //發送回執
        [self.xmppStream sendElement:msg];
      }
    }else
    {
      NSXMLElement *received = [message elementForName:@"received"];
      if (received)
      {
        if ([received.xmlns isEqualToString:@"urn:xmpp:receipts"])//消息回執
        {
          //發送成功
          NSLog(@"message send success!");
        } 
      } 
    } 
     
    //消息處理 
    //... 
  }

6. 添加AutoPing

為了監聽服務器是否有效，增加心跳監聽。用XEP-0199協議，在XMPPFrameWork框架下，封裝了 XMPPAutoPing 和 XMPPPing兩個類都可以使用，因為XMPPAutoPing已經組合進了XMPPPing類，所以XMPPAutoPing使用起來更方便。

//初始化並啟動ping
-(void)autoPingProxyServer:(NSString*)strProxyServer
{
  _xmppAutoPing = [[XMPPAutoPingalloc] init];
  [_xmppAutoPingactivate:_xmppStream];
  [_xmppAutoPingaddDelegate:selfdelegateQueue: dispatch_get_main_queue()];
  _xmppAutoPing.respondsToQueries = YES;
  _xmppAutoPing.pingInterval=2;//ping 間隔時間
  if (nil != strProxyServer)
  {
    _xmppAutoPing.targetJID = [XMPPJID jidWithString: strProxyServer ];//設置ping目標服務器，如果為nil,則監聽socketstream當前連接上的那個服務器
  }
}
//卸載監聽
 [_xmppAutoPing  deactivate];
 [_xmppAutoPing  removeDelegate:self];
  _xmppAutoPing = nil;
//ping XMPPAutoPingDelegate的委托方法:
- (void)xmppAutoPingDidSendPing:(XMPPAutoPing *)sender
{
  NSLog(@"- (void)xmppAutoPingDidSendPing:(XMPPAutoPing *)sender");
}
- (void)xmppAutoPingDidReceivePong:(XMPPAutoPing *)sender
{
  NSLog(@"- (void)xmppAutoPingDidReceivePong:(XMPPAutoPing *)sender");
}
  
- (void)xmppAutoPingDidTimeout:(XMPPAutoPing *)sender
{
  NSLog(@"- (void)xmppAutoPingDidTimeout:(XMPPAutoPing *)sender");
}

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