ios 显示气泡方法

#pragma mark Table view methods
- (UIView *)bubbleView:(NSString *)text from:(BOOL)fromSelf {
// build single chat bubble cell with given text
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];
    UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(21.0f, 14.0f, size.width+10, size.height+10)];
    [img setImage:[UIImage imageNamed:@"bubble.png"]];
   
    [returnView addSubview:img];
[bubbleImageView release];
[returnView addSubview:bubbleText];
[bubbleText release];
   
return [returnView autorelease];
}