Hi, does anyboda have details about the coefficient paramaters of the vDSP::twoPoleTwoZeroFilter method? https://developer.apple.com/documentation/accelerate/vdsp/3241153-twopoletwozerofilter I assume that there are two filter, two zero and a gain coefficient, but how is the order, the value range etc? Thanks Jürgen

Hi, we have an application that observes PDFViewVisiblePagesChanged and PDFViewPageChanged notifications for detecting the scroll state of a PDFView NotificationCenter.default.addObserver(self,                                                 selector: #selector(handleOnScroll),                                                name: Notification.Name.PDFViewVisiblePagesChanged,                                                 object: nil) NotificationCenter.default.addObserver(self,                                                 selector: #selector(handleOnScroll),                                                name: Notification.Name.PDFViewPageChanged,                                                 object: nil) With iOS14 this worked like a charm, the notification gets triggered immediately when the user starts scrolling the pdf. In iOS16 we have issues, it seems that the notifications get triggered/send only after the scrolling has been completed/stopped. Can anybody confirm this? Has anybody a solution how we can detect a scrolling PDFView using a different method? Background: While the PDF is scrolling other elements of the UI need to be disabled. Thanks Jürgen