Question

How can I underline text in a UITextView. I understand that I would need to create a subclass of UITextView, but what would go under drawRect:?

Thanks.

Answer 1

Try to use NSAttributedString as follows and set in UITextView. This works for iOS6.

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] initWithString:@"Some String"];
[attString addAttribute:(NSString*)kCTUnderlineStyleAttributeName 
                   value:[NSNumber numberWithInt:kCTUnderlineStyleSingle] 
                   range:(NSRange){0,[attString length]}];

For more info on NSAttributedString check this How do you use NSAttributedString?

For eg:-

textView.attributedText = attString;

From apple documentation on UITextView,

In iOS 6 and later, this class supports multiple text styles through
use of the attributedText property. (Styled text is not supported in
earlier versions of iOS.) Setting a value for this property causes the
text view to use the style information provided in the attributed
string. You can still use the font, textColor, and textAlignment
properties to set style attributes, but those properties apply to all
of the text in the text view.

attributedText:

The styled text displayed by the text view.

@property(nonatomic,copy) NSAttributedString *attributedText

Discussion: This property is nil by default. Assigning a new value to this property also replaces the value of the text property with the same string data, albeit without any formatting information. In addition, assigning a new a value updates the values in the font, textColor, and textAlignment properties so that they reflect the style information starting at location 0 in the attributed string.