NSAttributedString tail truncation in UILabel

Question

I'm using ContextLabel to parse @ , # and URL's. This is the best solution i found, cause it sizes correctly and dont affect performance. It firstly parses string at input and than converts it to NSAttributedString and after this assigns it to attributedText property of UILabel. Everything works as expected, except tail truncation - it's very incorrect ( see pic below )

Where shall i start digging - is it wrong attributes on attributed string? Or label layout issue? Thanks!

Are you hard coding the width of that label? – Feroz May 13 '16 at 11:16 — Feroz, May 13 '16 at 11:16

score 81 · Accepted Answer · edited May 23 '17 at 12:34

I had this problem and fixed it by adding a NSParagraphStyle specifying the desired line break mode:

    //assuming myString is an NSMutableAttributedString
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineBreakMode = .byTruncatingTail

    let range = NSRange(location: 0, length: myString.mutableString.length)
    myString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: range)

See Word wrap for NSMutableAttributedString for further reference.

score 21 · Answer 2 · edited Jan 30 '21 at 12:40

21

Following also works irrespective of using AttributedText or normal text.
Make sure to add the below line after setting the AttributedText and font to the label:

label.lineBreakMode = .byTruncatingTail

edited Jan 30 '21 at 12:40

Marián Černý

15,096
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answered Jan 10 '18 at 11:33

Nishchith

423
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You made my day! Thanks. Keyword - AFTER – Dmih Jan 20 '22 at 09:05

score 1 · Answer 3 · answered Dec 06 '22 at 08:45

func htmlToAttributedString() -> NSAttributedString?
    {
        guard let data = data(using: .utf8) else { return nil }
        do
        {
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.alignment = .left
            paragraphStyle.lineBreakMode = .byTruncatingTail
            
            
            let content = try NSMutableAttributedString(data: data, options: [.documentType:     NSAttributedString.DocumentType.html, .characterEncoding:     String.Encoding.utf8.rawValue], documentAttributes: nil)
            
            content.addAttributes([NSAttributedString.Key.paragraphStyle: paragraphStyle,
                                   NSAttributedString.Key.font: UIFont(name:"Poppins-Medium",size:18),
                                   NSAttributedString.Key.foregroundColor: UIColor(red: (94.0/255.0), green: (90.0/255.0), blue: (90.0/255.0), alpha: 1.0)],
                                  range: NSMakeRange(0, content.length))
            
            return content
        }
        catch
        {
            return nil
        }
    }

NSAttributedString tail truncation in UILabel

3 Answers3

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