气泡聊天

- (UIView *)bubbleView:(NSString *)text from:(BOOL)fromSelf {  
    UIView *returnView = [[UIView alloc] initWithFrame:CGRectZero];  
    returnView.backgroundColor = [UIColor clearColor];  
      
    UIImage *bubble = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:fromSelf ? @"bubbleSelf" : @"bubble" ofType:@"png"]];  
    UIImageView *bubbleImageView = [[UIImageView alloc] initWithImage:[bubble stretchableImageWithLeftCapWidth:21 topCapHeight:14]];  
      
    UIFont *font = [UIFont systemFontOfSize:12];  
    CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(150.0f, 1000.0f) lineBreakMode:UILineBreakModeCharacterWrap];  
      
    UILabel *bubbleText = [[UILabel alloc] initWithFrame:CGRectMake(21.0f, 14.0f, size.width + 10, size.height + 10)];  
    bubbleText.backgroundColor = [UIColor clearColor];  
    bubbleText.font = font;  
    bubbleText.numberOfLines = 0;  
    bubbleText.lineBreakMode = UILineBreakModeCharacterWrap;  
    bubbleText.text = text;  
      
    bubbleImageView.frame = CGRectMake(0.0f, 0.0f, 200.0f, size.height + 40.0f);  
    if(fromSelf)  
        returnView.frame = CGRectMake(120.0f, 10.0f, 200.0f, size.height + 50.0f);  
    else  
        returnView.frame = CGRectMake(0.0f, 10.0f, 200.0f, size.height + 50.0f);  
      
    [returnView addSubview:bubbleImageView];  
    [bubbleImageView release];  
    [returnView addSubview:bubbleText];  
    [bubbleText release];  
      
    return [returnView autorelease];  
} 
 
- (UIView *)bubbleView:(NSString *)text from:(BOOL)fromSelf {
       UIView *returnView = [[UIView alloc] initWithFrame:CGRectZero];
       returnView.backgroundColor = [UIColor clearColor];
      
       UIImage *bubble = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:fromSelf ? @"bubbleSelf" : @"bubble" ofType:@"png"]];
       UIImageView *bubbleImageView = [[UIImageView alloc] initWithImage:[bubble stretchableImageWithLeftCapWidth:21 topCapHeight:14]];
      
       UIFont *font = [UIFont systemFontOfSize:12];
       CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(150.0f, 1000.0f) lineBreakMode:UILineBreakModeCharacterWrap];
      
       UILabel *bubbleText = [[UILabel alloc] initWithFrame:CGRectMake(21.0f, 14.0f, size.width + 10, size.height + 10)];
       bubbleText.backgroundColor = [UIColor clearColor];
       bubbleText.font = font;
       bubbleText.numberOfLines = 0;
       bubbleText.lineBreakMode = UILineBreakModeCharacterWrap;