Fix scrollView zoom to infinity warning

Check if image view bounds width or height can be zero before setting scroll view zoom, to fix warning "UIScrollView is ignoring an attempt to set zoomScale to a non-finite value: inf"

Author: thomasdao

Sources/ImageViewerController.swift

@@ -222,6 +222,10 @@ class ImageViewerController:UIViewController, UIGestureRecognizerDelegate {
 extension ImageViewerController {
 
     func updateMinMaxZoomScaleForSize(_ size: CGSize) {
+        if imageView.bounds.width == 0 || imageView.bounds.height == 0 {
+            return
+        }
+        
         let minScale = min(
             size.width/imageView.bounds.width,
             size.height/imageView.bounds.height)