How to do a double tap zoom in using PDFView's built in PageViewController?

Question

I'm building a pdf viewer using PDFKit and the built in page view controller that's in PDFView. I want to be able to double tap the page and zoom in on that part of the screen.

I've tried the zoomIn: method and that doesn't seem to work with the page controller. I've also tried creating a PDFDestination and then using go(to:) on the PDFView but it isn't zooming in. I've also tried going to the destination and then just changing the scale factor but that just zooms in on the center of the page.

Here is my tap gesture:

doubleScreenTap = UITapGestureRecognizer(target: self, action: #selector(zoomIn(_:)))
doubleScreenTap.numberOfTapsRequired = 2
doubleScreenTap.numberOfTouchesRequired = 1
containerView.addGestureRecognizer(doubleScreenTap)

Here is the function that is being called:

@IBAction func zoomIn(_ gestureRecognizer: UITapGestureRecognizer)
{
     if gestureRecognizer.state == .ended
     {
          if let currentPage = pdfView.currentPage
          {
               let point = gestureRecognizer.location(in: pdfView)
               let destination = PDFDestination(page: currentPage, at: point)
               destination.zoom = (pdfView.scaleFactor * 1.5)
               pdfView.go(to: destination)
          {
     {
}

I looking to be able to zoom in on spot that is tapped. Let me know if I'm doing anything wrong or any knowledge you have on this. Thanks

Answer 1

If I am not mistaken this feature is already available for PDFView. It will work if you will define scale factor

pdfView.minScaleFactor = pdfView.scaleFactorForSizeToFit
pdfView.maxScaleFactor = 4.0
pdfView.scaleFactor = pdfView.scaleFactorForSizeToFit

Answer 2

// this enable double tap to zoom
pdfView.enableDataDetectors = false;