基於XMPP的IOS聊天用戶端程式(IOS端三)

標籤：

前兩篇介紹了如何通過XMPP來發送訊息和接收訊息，這一篇我們主要介紹如何來美化我們的聊天程式，看一下最終效果呢，當然來源程式也會在最後放出

好了，我們來看一下我們寫的程式

這裡我們自訂了TableViewCell

一行是顯示發布日期，一行是顯示發送的訊息，還有一個是背景

-(id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{  
      
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];  
    if (self) {  
        //日期標籤  
        senderAndTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 5, 300, 20)];  
        //置中顯示  
        senderAndTimeLabel.textAlignment = UITextAlignmentCenter;  
        senderAndTimeLabel.font = [UIFont systemFontOfSize:11.0];  
        //文字顏色  
        senderAndTimeLabel.textColor = [UIColor lightGrayColor];  
        [self.contentView addSubview:senderAndTimeLabel];  
          
        //背景圖  
        bgImageView = [[UIImageView alloc] initWithFrame:CGRectZero];  
        [self.contentView addSubview:bgImageView];  
          
        //聊天資訊  
        messageContentView = [[UITextView alloc] init];  
        messageContentView.backgroundColor = [UIColor clearColor];  
        //不可編輯  
        messageContentView.editable = NO;  
        messageContentView.scrollEnabled = NO;  
        [messageContentView sizeToFit];  
        [self.contentView addSubview:messageContentView];  
 
    }  
      
    return self;  
      
}

定義好，在UITableViewCell中將Cell改成我們自己定義的Cell

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{  
      
    static NSString *identifier = @"msgCell";  
      
    KKMessageCell *cell =(KKMessageCell *)[tableView dequeueReusableCellWithIdentifier:identifier];  
      
    if (cell == nil) {  
        cell = [[KKMessageCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:identifier];  
    }  
      
    NSMutableDictionary *dict = [messages objectAtIndex:indexPath.row];  
      
    //寄件者  
    NSString *sender = [dict objectForKey:@"sender"];  
    //訊息  
    NSString *message = [dict objectForKey:@"msg"];  
    //時間  
    NSString *time = [dict objectForKey:@"time"];  
      
    CGSize textSize = {260.0 ,10000.0};  
    CGSize size = [message sizeWithFont:[UIFont boldSystemFontOfSize:13] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap];  
      
    size.width +=(padding/2);  
      
    cell.messageContentView.text = message;  
    cell.accessoryType = UITableViewCellAccessoryNone;  
    cell.userInteractionEnabled = NO;  
      
    UIImage *bgImage = nil;  
      
    //發送訊息  
    if ([sender isEqualToString:@"you"]) {  
        //背景圖  
        bgImage = [[UIImage imageNamed:@"BlueBubble2.png"] stretchableImageWithLeftCapWidth:20 topCapHeight:15];  
        [cell.messageContentView setFrame:CGRectMake(padding, padding*2, size.width, size.height)];  
          
        [cell.bgImageView setFrame:CGRectMake(cell.messageContentView.frame.origin.x - padding/2, cell.messageContentView.frame.origin.y - padding/2, size.width + padding, size.height + padding)];  
    }else {  
          
        bgImage = [[UIImage imageNamed:@"GreenBubble2.png"] stretchableImageWithLeftCapWidth:14 topCapHeight:15];  
          
        [cell.messageContentView setFrame:CGRectMake(320-size.width - padding, padding*2, size.width, size.height)];  
        [cell.bgImageView setFrame:CGRectMake(cell.messageContentView.frame.origin.x - padding/2, cell.messageContentView.frame.origin.y - padding/2, size.width + padding, size.height + padding)];  
    }  
      
    cell.bgImageView.image = bgImage;  
    cell.senderAndTimeLabel.text = [NSString stringWithFormat:@"%@ %@", sender, time];  
 
    return cell;  
      
}

 

在這個Cell裡設定了發送的訊息的背景圖和接收訊息的背景圖

這裡在字典裡有一個"time"

這是我們接收和發送訊息的時間

(NSString *)getCurrentTime{  
      
    NSDate *nowUTC = [NSDate date];  
      
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];  
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];  
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];  
    [dateFormatter setTimeStyle:NSDateFormatterMediumStyle];  
      
    return [dateFormatter stringFromDate:nowUTC];  
      
}

在AppDelegate.m中

將我們收到訊息的內容也做一下調整

- (void)xmppStream:(XMPPStream *)sender didReceiveMessage:(XMPPMessage *)message{  
      
//   ......  
      
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];  
    [dict setObject:msg forKey:@"msg"];  
    [dict setObject:from forKey:@"sender"];  
    //訊息接收到的時間  
    [dict setObject:[Statics getCurrentTime] forKey:@"time"];  
      
   ......  
      
}

 

最後我們再設定一下每一行顯示的高度

//每一行的高度  
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{  
      
    NSMutableDictionary *dict  = [messages objectAtIndex:indexPath.row];  
    NSString *msg = [dict objectForKey:@"msg"];  
      
    CGSize textSize = {260.0 , 10000.0};  
    CGSize size = [msg sizeWithFont:[UIFont boldSystemFontOfSize:13] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap];  
      
    size.height += padding*2;  
      
    CGFloat height = size.height < 65 ? 65 : size.height;  
      
    return height;  
      
}

 

，對了，在發送訊息的時候，別忘了也加上

- (IBAction)sendButton:(id)sender {  
      
    //本地輸入框中的資訊  
    ......  
      
    if (message.length > 0) {  
          
        .....  
          
        NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];  
          
        [dictionary setObject:message forKey:@"msg"];  
        [dictionary setObject:@"you" forKey:@"sender"];  
        [dictionary setObject:[Statics getCurrentTime] forKey:@"time"];  
 
        [messages addObject:dictionary];  
          
        //重新重新整理tableView  
        [self.tView reloadData];  
          
    }  
      
      
}

 

好了，這裡關於XMPP發送訊息的教程就結束了，以後會詳細介紹其他關於XMPP的內容

 

基於XMPP的IOS聊天用戶端程式(IOS端三)