Why is underline style not working for a NSAttributedString? [duplicate]

Question

I have the following code to try to underline a label's string.

let attributedString = NSMutableAttributedString(string: "Hello World!")
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single, range: NSRange.init(location: 0, length: attributedString.length))
label.attributedText = attributedString

However, when running the code the label shows Hello World! with no underline.

I'm running Xcode 12.4, and using an iOS 14.4 iPhone 12 Pro Max simulator.

Testes

.underlineStyle: NSUnderlineStyle.single.rawValue – Drover

Try with TextView. It will work – Illiberal

@Illiberal There are reasons why using TextView might not be desired in this case. – Testes

@CharlieFish I have faced this too But I ended up using TextView for this bug – Illiberal

@Illiberal Yep, that might be a legit solution. Feel free to post an answer if you want to provide more detail. Likely many ways to solve this issue. Always good to share knowledge in case others run into a similar situation and having multiple answers or options is always helpful. – Testes

Answer 1

It seems like this is a bug. Changing the value from NSUnderlineStyle.single to 1 fixes the issue.

The final code would look something like the following.

let attributedString = NSMutableAttributedString(string: "Hello World!")
attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: 1, range: NSRange.init(location: 0, length: attributedString.length))
label.attributedText = attributedString

Testes

how can i get this answer from somewhere... big thx – Upcoming

you're holding it wrong. see https://mcmap.net/q/966899/-how-to-get-nsattributedstring-39-s-underline-style-attribute-to-work – Custodial