UILongPressGestureRecognizer eating presented UIAlertController touches?

Question

Created Mar ’22

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I have a UICollectionViewController in shared iOS/tvOS code. On iOS I use context menus while I fallback to UIAlertController (alert sheet) triggered by a long press on tvOS.

viewDidLoad:

override func viewDidLoad() {
    super.viewDidLoad()
    // ...
    #if os(tvOS)
    let longPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(longPressAction(_:)))
    collectionView.addGestureRecognizer(longPressGestureRecognizer)
    #endif
}

Selector:

#if os(tvOS)
@objc func longPressAction(_ sender: UIGestureRecognizer) {
    guard sender.state == .began else {
        return
    }
    if let indexPath = collectionView.indexPathForItem(at: sender.location(in: collectionView)) {
        let ac = UIAlertController(/* ... */) // alert sheet
        present(ac, animated: true, completion: nil)
    }
}
#endif

Upon long pressing, the alert sheet gets displayed properly on tvOS but the first tap on one of the sheet actions is ignored (this calls longPressAction again with a .cancel state). I tried inserting a sender.isEnabled = false after the guard but it simply caused the .cancel state to come in faster while still eating the first tap.

Suggestions?

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Answer 1

bbousquet OP

Mar ’22

It seems to work properly if I take action on the .ended state. However, this state is only attained when the touch ends, which isn't how I expect a long press to be triggered.

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