Set font failed when loading HTML data using NSAttributedString by swift 3?

Question

This code work perfectly.
But I have a problem that I want to load HTML data and change it's font.
And I try to using NSAttributedString to set UIFont, it doesn't work to me.
What should I do to change HTML data font, and calculate it's height correct?
Thanks.

func loadHtmlContent() {

    let articleHtmlData = "<head><style>img{width:300px !important;height:225px !important}</style></head>"+articleContent

    do {
        let attrStr = try NSMutableAttributedString(
            data: articleHtmlData.data(using: String.Encoding.unicode, allowLossyConversion: true)!,
            options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
            documentAttributes: nil)

        attrStr.enumerateAttribute(
            NSFontAttributeName,
            in:NSMakeRange(0,attrStr.length),
            options:.longestEffectiveRangeNotRequired) { value, range, stop in
                let f1 = value as! UIFont
                let f2 = UIFont(name:"Helvetica", size:20)!
                if let f3 = applyTraitsFromFont(f1, to:f2) {
                    attrStr.addAttribute(
                        NSFontAttributeName, value:f3, range:range)
                }
        }

        self.articleHeight = self.heightForHtmlString(attrStr)
        self.articleContentTextView.attributedText = attrStr

    } catch let error {
        print(error)
    }

}

func heightForHtmlString(_ text: NSAttributedString) -> CGFloat {
    let label:UILabel = UILabel.init(frame: CGRect.init(x: 0, y: 0, width: UIScreen.main.bounds.size.width-(16*4), height: CGFloat.greatestFiniteMagnitude))
    label.numberOfLines = 0
    label.lineBreakMode = NSLineBreakMode.byWordWrapping
    label.font = UIFont(name: "PingFangTC-Regular", size: 20.0)
    label.attributedText = text
    label.sizeToFit()
    return label.frame.height
}

Don't do label.font = UIFont(name: "PingFangTC-Regular", size: 20.0) when playing with label.attributedText. Use it only if you play with label.text. — Larme
– Larme, Commented Feb 23, 2018 at 9:11
Instead use the same logic as there: stackoverflow.com/a/41413014/1801544 Enumerate the FontAttributeName — Larme
– Larme, Commented Feb 23, 2018 at 9:13
@Larme I update question, and I use enumerateAttribute but textView doesn't show any. — tolerate＿Me_Thx
– tolerate＿Me_Thx, Commented Feb 23, 2018 at 9:39
Just make attrStr a NSMutableAttributeString instead of a NSAttributedString (in the init). attrStr.addAttribute(NSFontAttributeName, value:UIFont(name: "PingFangTC-Regular", size: 20.0), range:NSMakeRange(0,attrStr.length)) Also, it's useless to set NSFontAttributeName : UIFont.systemFont(ofSize: 20.0) in the options: because it won't be taken account (see the doc of that method). — Larme
– Larme, Commented Feb 23, 2018 at 9:42

Dhaval Solanki · Accepted Answer · 2018-02-23 09:44:50Z

1

 ->   You can try this

let myDescriptionHTML = "<html><head> <style type=\"text/css\"> body{color:red;}<style>img{display:inline;height:auto;max-width:100%;}body {font-family:\"Eurostile LT\";font-size:20;} p {margin:0px!important; color:black !important;}</style></head><body>\(Your Word)</body></html>" as String

 print(myDescriptionHTML)

answered Feb 23, 2018 at 9:44

Dhaval Solanki

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2 Comments

tolerate＿Me_Thx Over a year ago

Sorry, When I set "font-size:25" or up, my textView doesn't show any text. Why?

Dhaval Solanki Over a year ago

I checked this code in my project it is work for me.

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