在现阶段的通信服务中，各种标准都有，因此会出现无法实现相互连通，而XMPP(Extensible Message and PResence Protocol)协议的出现，实现了整个及时通信服务协议的互通。有了这个协议之后，使用任何一个组织或者个人提供的即使通信服务，都能够无障碍的与其他的及时通信服务的用户进行交流。例如google 公司2005年推出的Google talk就是一款基于XMPP协议的即时通信软件。下面我们就谈论一下如何简单的使用XMPP的接收和发送消息

1、在XMPPFramework.h中将需要用到的头文件打开

2、在storyboard创建展示消息页面

3、定义查询结果存储器并且进行初始化

//消息存档
@property(nonatomic,strong) XMPPMessageArchiving * messageArch;

//消息存档存储模型
@property(nonatomic,strong) XMPPMessageArchivingCoreDataStorage * messageStore;

4、在上面storyboard创建的控制器中，添加如下代码

AppDelegate * delgate=[UIapplication sharedApplication].delegate;
    
    //初始化头像
    XMPPJID * fromJid=[XMPPJID jidWithString:self.fromJid];
    NSData * fromData=[delgate.vCardAvatarModule photoDataForJID:fromJid];
    self.fromImage=[[UIImage  alloc] initWithData:fromData];

    NSString * userName= [[NSUserDefaults standardUserDefaults] objectForKey:@"userName"];
    XMPPJID * tojid=[XMPPJID jidWithString:userName];
    
    //设置图片模型
    NSData * toData=[delgate.vCardAvatarModule photoDataForJID:tojid];
    self.meImage=[[UIImage  alloc] initWithData:toData];
    
    if (self.fromImage==nil) {
        self.fromImage=[UIImage imageNamed:@"defalut"];
    }
    
    if (self.meImage==nil) {
        self.meImage=[UIImage imageNamed:@"defalut"];
    }

 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKey:) name:UIKeyboardWillShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(hideKey:) name:UIKeyboardWillHideNotification object:nil];
    
    //初始化数据存储
  NSString *user=  [[NSUserDefaults standardUserDefaults] objectForKey:@"userName"];
    
    //初始化请求
    NSFetchRequest * request=[[NSFetchRequest alloc] initWithEntityName:@"XMPPMessageArchiving_Message_CoreDataObject"];
    request.predicate=[NSPredicate predicateWithFormat:@"bareJidStr=%@ and streamBareJidStr=%@",self.fromJid,user];
    
    
    //定义排序
    NSSortDescriptor * des=[NSSortDescriptor sortDescriptorWithKey:@"timestamp" ascending:YES];
    [request setSortDescriptors:@[des]];
    
    //获取上下文
    NSManagedObjectContext *context=[delgate.messageStore mainThreadManagedObjectContext];
    
    //初始化结果存储器
    fetch=[[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:context sectionNameKeyPath:nil cacheName:nil];
    
    //设置代理
    fetch.delegate=self;
    
    //开始查询
    [fetch performFetch:nil];
    

5、创实现tableView的代理方法

-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    id <NSFetchedResultsSectionInfo>  info=fetch.sections[section];
        NSLog(@"===%ld",info.numberOfObjects);
    return [info numberOfObjects];
    
}
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 
    XMPPMessageArchiving_Message_CoreDataObject * obj=[fetch objectAtIndexPath:indexPath];
    JRChatTableViewCell * cell=nil;
    if (obj.isOutgoing) {
         cell=[tableView dequeueReusableCellWithIdentifier:@"cellto"];
    }else{
         cell=[tableView dequeueReusableCellWithIdentifier:@"cellfrom"];
    }
    
    
    //设置头像
    cell.image.image=self.meImage;
    cell.selectionStyle=UITableViewCellSelectionStyleNone;
    [cell setText:obj.body WithFlag:obj.isOutgoing ];
    return cell;

}

6、增加键盘控制

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKey:) name:UIKeyboardWillShowNotification object:nil];
    
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(hideKey:) name:UIKeyboardWillHideNotification object:nil];
- (void) showKey:(NSNotification * ) notify{
    CGFloat time=[notify.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]  ;
    CGRect frame=[notify.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    [UIView animateWithDuration:time animations:^{
        self.keyView.transform=CGAffineTransformMakeTranslation(0, frame.size.height*-1);
    }];
}

- (void) hideKey:(NSNotification * ) notify{
    CGFloat time=[notify.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]  ;
    [UIView animateWithDuration:time animations:^{
        self.keyView.transform=CGAffineTransformIdentity;
    }];
}

7、发送消息

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    
    //发送消息
    
    //1 取出文本
    AppDelegate * delgate=[UIApplication sharedApplication].delegate;
    
    XMPPJID * jid=[XMPPJID jidWithString:self.fromJid];
    
    //初始化消息体
    XMPPMessage * message=[XMPPMessage messageWithType:@"chat" to:jid];
    [message addBody:self.ketf.text];
    
    //发送消息
    [delgate.stream sendElement:message];
    
    //将消息置空
    self.ketf.text=nil;
    return YES;
}

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