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;  // 是否容许滚动会影响高度的展现

    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);
}

 

之前的方法用 先赋值, 再取textview的contentsize.height, iOS7后, 这个不能和了.

 

苹果目前不少状况下都是推荐使用 NSAttributedString 来计算一些数据.

 

ps: 若是 

detailTextView.scrollEnabled = NO;  // 是否容许滚动会影响高度的展现

不容许滚动, 计算出的高度仍是会少一点. 因此上面加了3个像素.

不知道是否是苹果你妹的bug.