ios - 与 UITapGestureRecognizer 一起使用时，collectionView 的 didSelectItemAt 不会被调用

Question

一旦我使用addGestureRecognizer在scrollView中关闭键盘，collectionView的didSelectItemAt将不起作用。有什么建议吗？

更新代码:目前我可以点击以关闭键盘并点击以对收集单元执行某些操作。但是，如果我滑动 ScrollView ，键盘就会消失。有什么办法可以防止这种情况发生？

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

尝试实现UIGestureRecognizerDelegate .在你的代码中实现它的 gestureRecognizer(_:shouldRecognizeSimultaneouslyWith:) 方法以返回 true - 这样你的手势识别器就会工作，但它也会允许识别其他手势(特别是 collectionView 中的那个)。

代码:

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

委托(delegate)实现:

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