title: Getting uilabel height for bold attributed text
body: <p>My code to calculate height required to for label is as follows:</p>
  
  <pre><code> -(float)frameForText:(NSString*)text sizeWithFont:(UIFont*)font constrainedToSize:     (float)width{
         NSDictionary *attributesDictionary = [NSDictionary   dictionaryWithObjectsAndKeys:font, NSFontAttributeName, nil];
         CGRect frame = [text boundingRectWithSize:(CGSize){width, CGFLOAT_MAX} options:      (NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:attributesDictionary
                                    context:nil];
        // This contains both height and width, but we really care about height.
         return frame.size.height;
  
    }
  </code></pre>
  
  <p>I have called it as follows from below code to calculate height firs then used it to draw label</p>
  
  <pre><code>    //form attributed title
      NSString *str_title =@"This is sample title to calculate height";
      NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
      [paragraphStyle setLineSpacing: 2.0f];
      NSDictionary *attributes = @{ NSFontAttributeName: [UIFont fontWithName:@"PTSans-Bold" size:10], NSParagraphStyleAttributeName: paragraphStyle };
      NSAttributedString *attributed_title = [[NSAttributedString alloc] initWithString:str_title attributes:attributes];
      //calculate height required for title
      float comment_height = [self frameForText:str_title sizeWithFont:[UIFont fontWithName:@"PTSans-Bold" size:10] constrainedToSize:250];
  
      UILabel *lbl_title;
      //use calculated height here
      lbl_title = [[UILabel alloc] initWithFrame:CGRectMake(60, 5, 250, title_height)];
      lbl_title.numberOfLines = 0;
      lbl_title.attributedText = attributed_title;
  </code></pre>
  
  <p>This works fine when font is "PTSans-Regular" and gives exact uilabel height. But, it is not working for "PTSans-Bold" by above code.</p>
  
  <p>How should I return exact UIlabel needed to write "PTSans-Bold" text with label of width 250, font's size 10 and paragraph line spacing equal to 2? Note: the "PTSans-Bold" is not system font, it's font I have added.</p>
  
  <p>Thanks.</p>