获取UITextView和UILabel的文本高度的方法

UITextView实际上是一个UIScrollView，因此获取contentSIze里的height属性即可

UITextView *tv=[[UITextView alloc]initWithFrame:CGRectMake(0,0,1024, 0)];
  tv.text=@"第一行\n第二行\n第三行";
  [detailView addSubview:tv];
  CGRect rect=tv.frame;
  rect.size.height=tv.contentSize.height;
  tv.frame=rect;
  [tv release];

UILabel比较麻烦

UILabel *detailText=[[UILabel alloc]initWithFrame:CGRectMake(0,daText.frame.size.height+daText.frame.origin.y,1024, 0)];
  detailText.backgroundColor=[UIColor blackColor];
  detailText.textColor=[UIColor whiteColor];
  detailText.font = [UIFont fontWithName:@"汉仪大黑简" size:13];
  detailText.numberOfLines=0;
  detailText.textAlignment = UITextAlignmentLeft;
  detailText.lineBreakMode = UILineBreakModeWordWrap;
[detailView addSubview:detailText];

detailText.text=info.answer;
  CGSize expectedLabelSize = [detailText.text sizeWithFont:detailText.font
                              constrainedToSize:detailText.frame.size
                                  lineBreakMode:UILineBreakModeWordWrap];

  CGRect rect2 = detailText.frame;
  rect2.size.height = expectedLabelSize.height;
  rect2.size.width=1024;
  detailText.frame=rect2;
  [detailText sizeToFit];
  if (detailText.frame.size.width<1024) {
    CGRect rect2 = detailText.frame;
    rect2.size.width=1024;
    detailText.frame=rect2;
  }
[detailView release];