CODEWITHSUNDEEP
iosswiftuicollectionviewuikituigesturerecognizer
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Reputation: 3393

collectionView(_:shouldBeginMultipleSelectionInteractionAt:) unexpectedly called for trackpad click

In my collection view, I want to be able to do a two-finger swipe to initiate edit mode and begin selecting rows. I do this by setting allowsSelectionDuringEditing and allowsMultipleSelectionDuringEditing to true, and I return true from the collectionView(_:shouldBeginMultipleSelectionInteractionAt:) delegate method.

For the most part, this works fine. The problem comes when using a trackpad.

A one-finger trackpad click also triggers the collectionView(_:shouldBeginMultipleSelectionInteractionAt:) callback. Not only is this not the way I want to initiate selection, it also blocks being able use the trackpad to tap on a cell to open my detail screen. But within that callback there doesn't seem to be a way to determine what kind of user event triggered it.

So, how do I keep this "two finger swipe to select" behavior without it getting messed up by trackpad clicks?

I tried adding my own gesture recognizer to help me detect swipes. But when I check it from within my shouldBeginMultipleSelectionInteractionAt callback I only ever see it in the possible state, even if I make sure to put it at the beginning of the gestureRecongizers array.

I also tried actually checking the collectionView.gestureRecognizers array for one-finger gestures that have triggered, but this did not work very consistently.

Upvotes: 0

Views: 26

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