接上一章的，這一章我們著重介紹XMPP

為了方便程序調用，我們把XMPP的一些主要方法寫在AppDelegate中

在AppDelegate.m下這幾個方法為：

[java]?view plaincopy

-(void)setupStream{??

??????

????//初始化XMPPStream??

????xmppStream?=?[[XMPPStream?alloc]?init];??

????[xmppStream?addDelegate:self?delegateQueue:dispatch_get_current_queue()];??

??????

}??

??

-(void)goOnline{??

??????

????//發送在線狀態??

????XMPPPresence?*presence?=?[XMPPPresence?presence];??

????[[self?xmppStream]?sendElement:presence];??

??????

}??

??

-(void)goOffline{??

??????

????//發送下線狀態??

????XMPPPresence?*presence?=?[XMPPPresence?presenceWithType:@"unavailable"];??

????[[self?xmppStream]?sendElement:presence];??

??????

}??

??

-(BOOL)connect{??

??????

????[self?setupStream];??

??????

????//從本地取得用戶名，密碼和服務器地址??

????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;??

????}??

??????

????//設置用戶??

????[xmppStream?setMyJID:[XMPPJID?jidWithString:userId]];??

????//設置服務器??

????[xmppStream?setHostName:server];??

????//密碼??

????password?=?pass;??

??????

????//連接服務器??

????NSError?*error?=?nil;??

????if?(![xmppStream?connect:&error])?{??

????????NSLog(@"cant?connect?%@",?server);??

????????return?NO;??

????}??

??????

????return?YES;??

??

}??

??

-(void)disconnect{??

??????

????[self?goOffline];??

????[xmppStream?disconnect];??

??????

}??

這幾個是基礎方法，接下來就是XMPPStreamDelegate中的方法，也是接受好友狀態，接受消息的重要方法

[java]?view plaincopy

//連接服務器??

-?(void)xmppStreamDidConnect:(XMPPStream?*)sender{??

??????

????isOpen?=?YES;??

????NSError?*error?=?nil;??

????//驗證密碼??

????[[self?xmppStream]?authenticateWithPassword:password?error:&error];??

??????

}??

??

//驗證通過??

-?(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(這個后面講)??

????[messageDelegate?newMessageReceived:dict];??

??????

}??

??

//收到好友狀態??

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

??????

//????NSLog(@"presence?=?%@",?presence);??

??????

????//取得好友狀態??

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

????//當前用戶??

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

????//在線用戶??

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

??????

????if?(![presenceFromUser?isEqualToString:userId])?{??

??????????

????????//在線狀態??

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

??????????????

????????????//用戶列表委托(后面講)??

????????????[chatDelegate?newBuddyOnline:[NSString?stringWithFormat:@"%@@%@",?presenceFromUser,?@"nqc1338a"]];??

??????????????

????????}else?if?([presenceType?isEqualToString:@"unavailable"])?{??

????????????//用戶列表委托(后面講)??

????????????[chatDelegate?buddyWentOffline:[NSString?stringWithFormat:@"%@@%@",?presenceFromUser,?@"nqc1338a"]];??

????????}??

??????????

????}??

??

}??

這里面有兩個委托方法，一個是用戶列表委托，還有一個就是消息委托，用戶列表委托主要就是取得在線用戶，更新用戶TableView，消息委托就是取得好友發送的消息，并更新消息TableView，當然這兩個TableView是在不同的Controller中的

定義完兩個委托，我們就要在不同的Controller中實現這兩個委托了

在好友Controller中實現<KKChatDelegate>并寫入如下方法

[java]?view plaincopy

//取得當前程序的委托??

-(KKAppDelegate?*)appDelegate{??

??????

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

??????

}??

??

//取得當前的XMPPStream??

-(XMPPStream?*)xmppStream{??

??????

????return?[[self?appDelegate]?xmppStream];??

}??

??

//在線好友??

-(void)newBuddyOnline:(NSString?*)buddyName{??

??????

????if?(![onlineUsers?containsObject:buddyName])?{??

????????[onlineUsers?addObject:buddyName];??

????????[self.tView?reloadData];??

????}??

??????

}??

??

//好友下線??

-(void)buddyWentOffline:(NSString?*)buddyName{??

??????

????[onlineUsers?removeObject:buddyName];??

????[self.tView?reloadData];??

??????

}??

在viewDidLoad中加入

[java]?view plaincopy

//設定在線用戶委托??

????KKAppDelegate?*del?=?[self?appDelegate];??

????del.chatDelegate?=?self;??

這兩行代碼，讓好友列表的委托實現方法在本程序中

在viewWillAppear中加入

[java]?view plaincopy

[super?viewWillAppear:animated];??

??

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

??

if?(login)?{??

??????

????if?([[self?appDelegate]?connect])?{??

????????NSLog(@"show?buddy?list");??

??????????

????}??

??????

}else?{??

??????

????//設定用戶??

????[self?Account:self];??

??????

}??

判斷本地保存的數據中是否有userId，沒有的話就跳轉到登錄頁面

這里最重要的就是connect了，這一句話就是登錄了，成功的話，頁面就會顯示好友列表了。

[java]?view plaincopy

#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;??

????}??

}??

當顯示出好友列表，我們選擇一個好友進行聊天

將當前好友名稱發送給聊天頁面

下面是聊天Controller了

在KKChatController.h中加入

[java]?view plaincopy

NSMutableArray?*messages;??

這是我們要顯示的消息，每一條消息為一條字典

接下來就是每一條消息的顯示了

[java]?view plaincopy

-(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一樣，這里我們也需要XMPPStream

[java]?view plaincopy

-(KKAppDelegate?*)appDelegate{??

??????

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

}??

??

-(XMPPStream?*)xmppStream{??

??????

????return?[[self?appDelegate]?xmppStream];??

}??

在ViewDidLoad中加入

[java]?view plaincopy

KKAppDelegate?*del?=?[self?appDelegate];??

del.messageDelegate?=?self;??

設定消息委托由自己來接收和處理

[java]?view plaincopy

#pragma?mark?KKMessageDelegate??

-(void)newMessageReceived:(NSDictionary?*)messageCotent{??

??????

????[messages?addObject:messageCotent];??

??????

????[self.tView?reloadData];??

??????

}??

接下來最重要的就是發送消息了

[java]?view plaincopy

-?(IBAction)sendButton:(id)sender?{??

??????

????//本地輸入框中的信息??

????NSString?*message?=?self.messageTextField.text;??

??????

????if?(message.length?>?0)?{??

??????????

????????//XMPPFramework主要是通過KissXML來生成XML文件??

????????//生成<body>文檔??

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

????????[body?setStringValue:message];??

??????????

????????//生成XML消息文檔??

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

????????//消息類型??

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

????????//發送給誰??

????????[mes?addAttributeWithName:@"to"?stringValue:chatWithUser];??

????????//由誰發送??

????????[mes?addAttributeWithName:@"from"?stringValue:[[NSUserDefaults?standardUserDefaults]?stringForKey:USERID]];??

????????//組合??

????????[mes?addChild:body];??

??????????

????????//發送消息??

????????[[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];??

??????????

????}??

??????

??????

}??

上面都加了注釋，大家應該能明白，接下來還有一個章節，我們會對發送的消息在界面進行美化，跟蘋果自帶的消息一樣。謝謝大家有耐心看完，我這個人比較不喜歡打字，所以有的地方注釋比較少，希望大家別介意，還有希望大家能夠多多支持， 以后會接著介紹XMPP文件傳輸之類的內容。

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