在現階段的通訊服務中，各種標準都有，因此會出現無法實現相互連通，而XMPP(Extensible Message and presence Protocol)協議的出現，實現了整個及時通訊服務協議的互通。有了這個協議之後，使用任何一個組織或者個人提供的即使通訊服務，都能夠無障礙的與其他的及時通訊服務的使用者進行交流。例如google 公司2005年推出的Google talk就是一款基於XMPP協議的即時通訊軟體。下面我們就談論一下如何簡單的使用XMPP的接收和傳送訊息

1、在XMPPFramework.h中將需要用到的標頭檔案開啟

2、在storyboard建立展示訊息頁面

3、定義查詢結果儲存器並且進行初始化

//訊息存檔
@property(nonatomic,strong) XMPPMessageArchiving * messageArch;

//訊息存檔儲存模型
@property(nonatomic,strong) XMPPMessageArchivingCoreDataStorage * messageStore;

4、在上面storyboard建立的控制器中，新增如下程式碼

AppDelegate * delgate=[UIApplication sharedApplication].delegate;
    
    //初始化頭像
    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];
    
    //設定圖片模型
    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];
    
    //初始化資料儲存
  NSString *user=  [[NSUserDefaults standardUserDefaults] objectForKey:@"userName"];
    
    //初始化請求
    NSFetchRequest * request=[[NSFetchRequest alloc] initWithEntityName:@"XMPPMessageArchiving_Message_CoreDataObject"];
    request.predicate=[NSPredicate predicateWithFormat:@"bareJidStr=%@ and streamBareJidStr=%@",self.fromJid,user];
    
    
    //定義排序
    NSSortDescriptor * des=[NSSortDescriptor sortDescriptorWithKey:@"timestamp" ascending:YES];
    [request setSortDescriptors:@[des]];
    
    //獲取上下文
    NSManagedObjectContext *context=[delgate.messageStore mainThreadManagedObjectContext];
    
    //初始化結果儲存器
    fetch=[[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:context sectionNameKeyPath:nil cacheName:nil];
    
    //設定代理
    fetch.delegate=self;
    
    //開始查詢
    [fetch performFetch:nil];
    

5、創實現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"];
    }
    
    
    //設定頭像
    cell.image.image=self.meImage;
    cell.selectionStyle=UITableViewCellSelectionStyleNone;
    [cell setText:obj.body WithFlag:obj.isOutgoing ];
    return cell;

}

6、增加鍵盤控制

  [[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、傳送訊息

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    
    //傳送訊息
    
    //1 取出文字
    AppDelegate * delgate=[UIApplication sharedApplication].delegate;
    
    XMPPJID * jid=[XMPPJID jidWithString:self.fromJid];
    
    //初始化訊息體
    XMPPMessage * message=[XMPPMessage messageWithType:@"chat" to:jid];
    [message addBody:self.ketf.text];
    
    //傳送訊息
    [delgate.stream sendElement:message];
    
    //將訊息置空
    self.ketf.text=nil;
    return YES;
}

　　想要了解更多內容的小夥伴，可以點選檢視原始碼，親自執行測試。

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