Calculate size of NSAttributedString from HTML - objective-c

Question

I am using a UITextView to display an NSAttributedString from some given HTML, which can includes elements such as bold, italicized, lists, marked, super & subscript, etc.
Currently the code below works pretty well for just paragraphs of text, but once I start adding more complicated elements such as lists and line breaks, the sizing is completely off.
// Create the NSMutableAttributedString from given HTML
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *options = #{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: #(NSUTF8StringEncoding)};
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithData:data options:options
documentAttributes:nil error:nil];
// Max size for the text container (no limit on height)
CGSize bounds = CGSizeMake(320.0, CGFLOAT_MAX);
// Set the font and size for better rendering results
UIFont *font = [UIFont fontWithName:#"Roboto" size:14.0];
NSDictionary *attrFont = [NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
NSRange range = NSMakeRange(0, str.length);
[str addAttributes:attrFont range:range];
// Calcualte the size of the UITextView based on the above parameters
CGRect rect = [str boundingRectWithSize:bounds options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading| NSStringDrawingUsesDeviceMetrics context:nil];
I've done some searching and found this thread, but after trying what is suggested over there it still doesn't appear to be working, wondering if anyone knows of a better way to do this?
Calculate Height Of NSAttributedString Containing HTML

Answer 1

Ok after much fiddling around I found that the sizes are actually correct, but the UITextView has some padding / insets that cause the overflow. Setting the following on the textView fixed the problem
[self.textView setTextContainerInset:UIEdgeInsetsZero];
self.textView.textContainer.lineFragmentPadding = 0;