A Boolean value that indicates that zooming has exceeded the scaling limits specified for the receiver.
The value of this property is
true if the scroll view is zooming back to a minimum or maximum zoom scaling value; otherwise the value is
Zooming and Panning
var zoomScale: CGFloat
A floating-point value that specifies the current scale factor applied to the scroll view's content.
var isZooming: Bool
A Boolean value that indicates whether the content view is currently zooming in or out.
var bouncesZoom: Bool
A Boolean value that determines whether the scroll view animates the content scaling when the scaling exceeds the maximum or minimum limits.