I have implemented a collection view with drag and drop delegates as described in WWDC 2017 Drag Drop Collection View. The purpose of my collection view is to reorder within its cell. Now, here's my problem I want to make it scroll automatically when I drag the cell (after the long press) out of the collection view. I want to make it scroll to the down direction when I drag it to under my collection view and scroll it to Up when I drag it top and outside the collection view. Besides I'm not satisfied with the built-in auto scrolling.
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