How to transfer HTML text into an attributed string without losing line breaks in Swift 3

Question

Please do not mark as duplicate. None of the existing questions solves not losing line breaks.

Given String: "Regular text becomes bold with \n\nAn italic\n\nLinebreak"

I have two options:

let attrStr = try! NSAttributedString(
        data: story.body.data(using: String.Encoding.unicode, allowLossyConversion: true)!,
        options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                   NSFontAttributeName: Handler.shared.setFont(FontNames.sourceSerifProRegular, 25.0)],
        documentAttributes: nil)

This option loses the font, size and the line breaks.

The following extension from this answer, keeps UILabel's font, but it loses the line breaks as well.

extension UILabel {
    func _slpGetSize() -> CGSize? {
        return (text as NSString?)?.size(attributes: [NSFontAttributeName: font])
    }

    func setHTMLFromString(htmlText: String) {
        let modifiedFont = NSString(format:"<span style=\"font-family: \(self.font!.fontName); font-size: \(self.font!.pointSize)\">%@</span>" as NSString, htmlText) as String

        let attrStr = try! NSAttributedString(
            data: modifiedFont.data(using: .unicode, allowLossyConversion: true)!,
            options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue],
            documentAttributes: nil)

        self.attributedText = attrStr
    }
}

label.setHTMLFromString(htmlText: story.body)

What am I missing? What do I need to do to keep the line breaks? Help is very appreciated.

@LeoDabus I have tried changing `using: .unicode` to `using: .utf8`, same. — David Seek, Apr 12 '17 at 00:02
I have just updated the answer. If you use it properly it will work. — Leo Dabus, Apr 12 '17 at 00:06
If you use the extension just use `yourHTMLCode.data.attributedString` — Leo Dabus, Apr 12 '17 at 00:20
the text is bold and italic, but the line breaks are missing. — David Seek, Apr 12 '17 at 00:22
okay well. that solves that, huh. @LeoDabus since you seem super fit in that, can you tell me, to change the space between lines `using my code`, what do i have to add? — David Seek, Apr 12 '17 at 00:35
i have already done that, worked like a charm, but now the spacing between the lines is big af. any ideas? — David Seek, Apr 12 '17 at 00:40
@DavidSeek I got a solution, you can replace \n character with
tag before converting HTML text into an attributed string. For instance, here you can do the following story.body.replacingOccurrences(of: "\n", with: "
") . Now you can safely convert HTML text into an attributed string. — Mohammad Daihan, Jul 27 '22 at 05:42
To retain the font and size you can use let attrStr = try! NSAttributedString( data: story.body.data(using: String.Encoding.utf16, allowLossyConversion: true)!, options: [ .documentType: NSAttributedString.DocumentType.html, NSFontAttributeName: Handler.shared.setFont(FontNames.sourceSerifProRegular, 25.0)], documentAttributes: nil) — Mohammad Daihan, Jul 27 '22 at 06:56

score 2 · Accepted Answer · answered Apr 11 '17 at 23:39

Try set numberOfLines property in the UILabel.

For that, you can count the number of break lines and set into numberOfLines.

extension UILabel {
    func _slpGetSize() -> CGSize? {
        return (text as NSString?)?.size(attributes: [NSFontAttributeName: font])
    }

    func setHTMLFromString(htmlText: String) {
        let modifiedFont = NSString(format:"<span style=\"font-family: \(self.font!.fontName); font-size: \(self.font!.pointSize)\">%@</span>" as NSString, htmlText) as String

        let attrStr = try! NSAttributedString(
            data: modifiedFont.data(using: .unicode, allowLossyConversion: true)!,
            options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue],
            documentAttributes: nil)

        self.attributedText = attrStr

        self.numberOfLines = htmlText.components(separatedBy: "\n").count
    }
}

I hope this example help you.

I've just test this code and works fine to me. What's happened? — andercruzbr, Apr 12 '17 at 00:44

How to transfer HTML text into an attributed string without losing line breaks in Swift 3

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