Adding underline to UILabel attributed string from the storyboard fails
Here is the solution in storyboard:Open the Attribute Inspector (make sure label is selected), Change the dropdown value from 'Plain' to 'Attributed'. Now a a small text editor will be visible under the font of the label. Select the text of the label, right click and change the font to 'underline'.
I also have attached a screenshot and successfully underlined a text using storyboard in XCode 7.0.1
Underline your text in TextEdit(cmd-U) and copy-paste it in Attribute Inspector > Label > Text > Attributed.
Select label -> Attribute editor -> Title = Attributed
Select the text of the label in the text view in the editor -> Right click -> Font -> check Underline
If the change is not visible -> resize the label