How to check if an NSMutableAttributedString font size is smaller/greater than some value?

Question

I try to make an if block by checking if an NSMutableAttributedString font size is smaller/greater than some value. I couldn't find an explanation about this. Code sample is as follows:

if textView.font.pointSize < 30 {
   //execute
}

where string inside textView is NSMutableAttributedString. Any ideas?

Answer 1

Not tested, but that should do the trick

extension UITextView {
    func maxPointSize() -> CGFloat {
        var max: CGFloat = font?.pointSize ?? 0.0 //In case you mix .attributedText and .text but I'd recommand to avoid mixing them.
        guard let attributedString = attributedText else { return max }
        attributedString.enumerateAttribute(.font, in: NSRange(location: 0, length: attributedString.length), options: []) { value, range, pointee in
            guard let font = value as? UIFont else { return }
            max = font.pointSize > max ? font.pointSize : max
        }
        return max
    }
}

The idea is to enumerate the fonts inside the NSAttributedString, and keep the max value.

Then

if textView.maxPointSize() < 30 {
   //execute
}