Why is underline style not working for a NSAttributedString?

user_894067 0
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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.

nsattributedstring swift uilabel uikit ios
1 Answers

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
user_8940670
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