UITextView 动态高度计算(iOS7版)

 NSDictionary *attrsDictionary = [NSDictionarydictionaryWithObject:[UIFontsystemFontOfSize:kCellContentFontSize]

                                                                forKey:NSFontAttributeName];

    NSAttributedString *attributedText = [[[NSAttributedString alloc] initWithString:_contentStr attributes:attrsDictionary] autorelease];

    NSInteger detailHeight = [BZDataDealer textViewHeightForAttributedText:attributedText

                                                                  andWidth:detailLabelWidth];

    UITextView *detailTextView = [[UITextView alloc] initWithFrame:CGRectMake(10, 35, detailLabelWidth, detailHeight+3)];  // 加3个像素

    detailTextView.scrollEnabled = NO;  // 是否允许滚动会影响高度的展示

    detailTextView.text = _contentStr;

    [containerView addSubview:detailTextView];

+ (NSInteger)textViewHeightForAttributedText:(NSAttributedString *)text andWidth:(CGFloat)width
{
    UITextView *textView = [[UITextView alloc] init];
    [textView setAttributedText:text];
    CGSize size = [textView sizeThatFits:CGSizeMake(width, FLT_MAX)];
    return (NSInteger)(size.height);
}