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startupcode/HtmlToAttributedString.swift

Last active October 3, 2023 01:08
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Swift - Assign HTML to NSAttributedString with custom FONT
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HtmlToAttributedString.swift
//Usage
lbl.attributedText = htmlToAttributedString ("html text")
//Assign attributed string
func htmlToAttributedString(string : String) -> NSAttributedString{
var attribStr = NSMutableAttributedString()
do {//, allowLossyConversion: true
attribStr = try NSMutableAttributedString(data: string.dataUsingEncoding(NSUnicodeStringEncoding)!, options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
let textRangeForFont : NSRange = NSMakeRange(0, attribStr.length)
attribStr.addAttributes([NSFontAttributeName : UIFont(name: "Arial", size:15)!], range: textRangeForFont)
} catch {
print(error)
}
return attribStr
}
@hdmdhr
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hdmdhr commented Jul 29, 2022 •
edited
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It does not seem to work.

The code below worked for me.

First it converts html string to default attributed string; then it enumerates font attribute in the result string, replace the system default font with your custom font; then finally add your new font as a new attribute.

guard let attributedString = try? NSMutableAttributedString(data: Data(htmlString.utf8),
                                                                            options: [.documentType: NSAttributedString.DocumentType.html,
                                                                                      .characterEncoding: String.Encoding.utf8.rawValue],
                                                                            documentAttributes: nil)
                else {
                    return .init(string: "Invalid content")
                }
                
                let range = NSRange(location: 0, length: attributedString.length)
                
                attributedString.enumerateAttribute(.font, in: range) { value, range, pointer in
                    guard let currentFont = value as? UIFont else { return }
                    
                    let isBold = currentFont.fontName.lowercased().contains("bold")
                    let replacementFont = UIFont(name: isBold ? "Arial-Bold" : "Arial", size: currentFont.pointSize)
                    
                    let replacementAttribute = [NSAttributedString.Key.font: replacementFont]
                    attributedString.addAttributes(replacementAttribute, range: range)
                }
                
                return attributedString

@startupcode
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startupcode commented Jul 30, 2022 via email

@NikKovIos
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NikKovIos commented Dec 18, 2022 •
edited
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The both of these gists would break markdown. For example monospace and italic text style. This could help, but not working with custom fonts https://stackoverflow.com/a/33828793/5790492

Maybe someone need only to change the size of default font https://stackoverflow.com/a/74841172/5790492

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startupcode commented Dec 19, 2022 via email

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