Set bold to one UITextView iOS swift

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Solution:

 The below function is used for set the bold to the TextView.


    @IBAction func didTapOnBold(_ sender: Any) {
        let textView = TextView
        if textView != nil {
            var fonts = textView.font
            fonts = (fonts?.isBold)! ? fonts?.removeBold() : fonts?.setBold()
textView.font = fonts!.fontName



        }

    }




extension UIFont
{



var isBold: Bool
    {
        return fontDescriptor.symbolicTraits.contains(.traitBold)

    }

//set the bold
func setBold() -> UIFont
    {
        if isBold {
            return self
            
        } else {
            var symTraits = fontDescriptor.symbolicTraits
            symTraits.insert([.traitBold])
            let fontDescriptorVar = fontDescriptor.withSymbolicTraits(symTraits)
            return UIFont(descriptor: fontDescriptorVar!, size: 0)
        }

    }

//remove the bold
func removeBold()-> UIFont
    {
        if !isBold {
            return self
        } else {
            var symTraits = fontDescriptor.symbolicTraits
            symTraits.remove([.traitBold])
            let fontDescriptorVar = fontDescriptor.withSymbolicTraits(symTraits)
            return UIFont(descriptor: fontDescriptorVar!, size: 0)
        }
    }
}

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