scrollView(_:handle:completion:)

Declaration

optional func scrollView(_ scrollView: BEScrollView, handle scrollUpdate: BEScrollViewScrollUpdate, completion: @escaping (Bool) -> Void)

optional func scrollView(_ scrollView: BEScrollView, handle scrollUpdate: BEScrollViewScrollUpdate) async -> Bool

Parameters

• scrollView:

  The Bescrollview that receives the scroll update.

• scrollUpdate:

  An object that describes the scroll update. Retrieve all information from this object immediately on the main queue when the system calls your delegate method, as the values may change.

• completion:

  A block to call when you finish processing the scroll update. Pass true if you handled the scroll event and the scroll view doesn’t need to react to it; pass false otherwise.

Discussion

Your BEScrollViewDelegate receives scroll updates before its delegating scroll view handles them. The system calls this method on the main queue — retrieve information from scrollUpdate on the main queue, then process the update asynchronously. Call the completion block asynchronously on the main queue when you finish processing.