How to set font size on NSAttributedString

In Swift you can use:

let stringWithAttribute = NSAttributedString(string: selectedFilter ?? "",
                                             attributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 14.0)])

The only thing that worked for me is to wrap the HTML in a <span> and apply the style there:

let modifiedFontString = "<span style=\"font-family: Lato-Regular; font-size: 14; color: rgb(60, 60, 60)\">" + originalHTMLString + "</span>"

Try this extension:

extension String {

    var htmlToAttributedString: NSAttributedString? {
        guard let data = data(using: .utf8) else { return NSAttributedString() }
        do {
            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            return NSAttributedString()
        }
    }

    var htmlToString: String {
        return htmlToAttributedString?.string ?? ""
    }

    func convertToAttributedString() -> NSAttributedString? {
        let modifiedFontString = "<span style=\"font-family: Lato-Regular; font-size: 14; color: rgb(60, 60, 60)\">" + self + "</span>"
        return modifiedFontString.htmlToAttributedString
    }
}

And you use it like this:

someLabel.attributedString = someHTMLString.convertToAttributedString()

Hope it helps!

let myString = "Swift Attributed String"
let myAttribute = [ NSForegroundColorAttributeName: UIColor.blue ]
let myAttrString = NSAttributedString(string: myString, attributes: myAttribute) 

// set attributed text on a UILabel
myLabel.attributedText = myAttrString

Font

let myAttribute = [ NSFontAttributeName: UIFont(name: "Chalkduster", size: 18.0)! ]

Shadow

let myShadow = NSShadow()
myShadow.shadowBlurRadius = 3
myShadow.shadowOffset = CGSize(width: 3, height: 3)
myShadow.shadowColor = UIColor.gray
let myAttribute = [ NSShadowAttributeName: myShadow ]

Underline

let myAttribute = [ NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue ]

Textcolor

let myAttribute = [ NSForegroundColorAttributeName: UIColor.blue ]

Background Color

let myAttribute = [ NSBackgroundColorAttributeName: UIColor.yellow ]