字符串在ios webview中重新流动

Question

我有一个很长的文本，我想要重排并在带有禁用滚动的uiwebview中显示。我尝试使用此代码：

-(NSInteger)lengthOfString:(NSString *)str 
          thatFitsIntoView:(UIView *)displayView 
                  withFont:(UIFont *)font
{
      CGSize textSize = [str sizeWithFont:font 
                        constrainedToSize:displayView.frame.size 
                            lineBreakMode:NSLineBreakByWordWrapping];


 NSInteger lengthThatFits;
 CGFloat display = 414.000000;
 NSLog(@"%f -%f",displayView.frame.size.width,textSize.height);
 if (textSize.height > displayView.frame.size.width)
 {
      lengthThatFits = str.length * display / textSize.height;
 } 
 else 
 {
      lengthThatFits = str.length;
 }
 return lengthThatFits;

}

要检查字符串的哪个部分适合单个视图，但仍然给我一个字符串长度超过适合webview的字符串长度。有没有办法拆分字符串以适合单个视图？