How to use add pinch-to-zoom to a TextView (Swift)

TextViewPinchToZoom.swift

var pinchGestureRecognizer : UIPinchGestureRecognizer!

override func viewDidLoad() {
    super.viewDidLoad()
    pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(pinchGesture))
    self.textView.addGestureRecognizer(pinchGestureRecognizer)
}


@objc func pinchGesture(gestureRecognizer: UIPinchGestureRecognizer ) {
    print("*** Pinch: Scale: \(gestureRecognizer.scale) Velocity: \(gestureRecognizer.velocity)")
    
    let font = self.textView.font
    var pointSize = font?.pointSize
    let fontName = font?.fontName
    
    pointSize = ((gestureRecognizer.velocity > 0) ? 1 : -1) * 1 + pointSize!;
    
    if (pointSize! < 13) { pointSize = 13}
    if (pointSize! > 42) { pointSize = 42}
        
    self.textView.font = UIFont(name: fontName!, size: pointSize!)
}

Thanks for sharing! Any idea how to preserve the formatting of an NSAttributedString rendered by the textView? I.e., you have inline headings, bold text etc. - All get away when following this approach...

I didn't tried but you should set it's ´NSAttributedString´ inside the pinchGesture(gestureRecognizer