与UITapGestureRecognizer一起使用时，不调用collectionView的didSelectItemAt

Question

Once I use addGestureRecognizer to dismiss keyboard in scrollView, collectionView's didSelectItemAt would not work. Any suggestions?

UPDATE CODE: Currently I can tap to dismiss keyboard and tap to do something with collection cell. But, if I swipe the scrollView, the keyboard will dismiss. Any way to prevent that?

class PostVC: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

    @IBOutlet weak var colorCollectionView: UICollectionView!
    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var titleTextField: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        let tapViewGesture = UITapGestureRecognizer(target: self, action: #selector(PostVC.didTapViewForDismissKeyboard))
        scrollView.addGestureRecognizer(tapViewGesture)
        tapViewGesture.delegate = self
    }

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool{
        view.endEditing(true)
        return false
    }

    func didTapViewForDismissKeyboard(_ pressed: UIGestureRecognizer) {
        view.endEditing(true)
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        print("HIHI")
    }

extension PostVC: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

Answer 1

Try to implement UIGestureRecognizerDelegate . Implement its gestureRecognizer(_:shouldRecognizeSimultaneouslyWith:) method in your code to return true - that way your gesture recognizer will work, but it will also allow other gestures to be recognized (specifically the one in the collectionView ).

Code:

// add this to initializing code to set gesture recognizer's delegate to self
tapViewGesture.delegate = self

Delegate implementation:

extension YourViewController: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

Answer 2

Don't use a gesture recognizer. That is intercepting your taps and not giving them to the collection view. Instead put your call to view.endEditing(true) in the collectionView(_:didSelectItemAt:) method.