boscojwho / sheetinteraction Goto Github PK

When two or more modal sheets are presented, and user quickly swipes to close the top sheet, iOS may automatically move the now top-most sheet to a detent it deems appropriate.

When that happens, we need to figure out how to observe that change, and notify SheetInteraction's delegate.

Currently, the delegate isn't notified, and user-interface state may not reflect the actual selected detent.

When prefersScrollingExpandsWhenScrolledToEdge == true, and sheet interaction begins on a scroll view, UISheetPresentationController.selectedDetentIdentifier doesn't immediately reflect where sheet will rest on user interaction end (i.e. touch up).

UISheetPresentationController.selectedDetentIdentifier does immediately reflect end state when user interaction begins on a non-scroll view.

In this case, don't emit change events in this case because pan gesture will never cause sheet view to change height.

Currently, SheetInteraction.Change.percentageTotal is not calculated relative to a sheet's maximumDetentValue. In other words, detent.resolutionContext.maximumDetentValue * 0.5 does not equal percentageTotal = 0.5.

Ideally, these two values would be the same.

Ensure overscroll values are still properly reported when making this change.