Problem with gesture in Xcode 12 and iOS 14

Question

I have a problem after upgrading to Xcode 12 and iOS 14.

Scenario: I have a Nested UITableView: nestedTableView. Like below

class GAllowGestureEventPassTableView: UITableView, UIGestureRecognizerDelegate {

    var allowGestureEventPassViews: [UIView] = []
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        panGestureRecognizer.cancelsTouchesInView = false
        guard let otherView = otherGestureRecognizer.view else { return false }
        print("tableView  : \(type(of: otherView))")
        if allowGestureEventPassViews.contains(otherView) {
            print("allowGestureEventPassViews contains  : \(type(of: otherView))")
            print("gesture pass  ")
            return true
        } else {
            return false
        }
    }
}

Then I add another UITableView to nestedTableView's allowGestureEventPassViews array. so I can control which tableView can be scroll.

    self.nestedTableView.allowGestureEventPassViews.append(controller.tableView)

In Xcode 11.7, iOS 14 worked just fine.

Log:

tableView  : GAllowGestureEventPassTableView
tableView  : GAllowGestureEventPassTableView
tableView  : GAllowGestureEventPassTableView
tableView  : UITableView
allowGestureEventPassViews contains  : UITableView
gesture pass

but after upgrading to Xcode 12 gesture seen to be different. In Xcode 12 The gesture never pass through the nestedTableView.

tableView  : GAllowGestureEventPassTableView
tableView  : GAllowGestureEventPassTableView
tableView  : GAllowGestureEventPassTableView
tableView  : UITableViewCellContentView

Does anyone has the same problem? or an I misunderstand something about iOS14 gesture.

score 36 · Accepted Answer · answered Sep 21 '20 at 09:03

36

I found the answer.

In iOS14 some reason, UITableViewCellContentView hierarchy is different.

In tableView(_:cellForRowAt:) I add subview

 cell.addSubview(contentScollView)

UITableViewCellContentView is blocking the gesture.

Change to

 cell.contentView.addSubview(contentScollView)

This solve my problem.

answered Sep 21 '20 at 09:03

Django Free

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4
10

3

Thank you for discovering this so quickly! Helped a lot – Ludovico Verniani Sep 21 '20 at 18:53
Apple is really messing with me with this iOS14 release. Good eye. In my case it was a UICollectionView inside of a UITableViewCell – Danny Sep 22 '20 at 05:03
1

Wow I can't believe, this thing messes with all my app. How come they do things like that?! – Gal Shahar Oct 07 '20 at 22:17
Wow THANK YOU! I would have never found that myself :) – Mansoor Shah Said Nov 16 '20 at 20:14
Does anybody know that how to fix in OBJC? it's was working like charm but after iOS 14 it's not working! – Rushang Prajapati Mar 24 '21 at 07:52

score 0 · Answer 2 · edited Sep 23 '21 at 15:12

0

In Objective C:

[self.contentView addSubview: contentScollView];

edited Sep 23 '21 at 15:12

Ryan M

18,333
31
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answered Sep 23 '21 at 14:38

Andriy Grytsiv

41
2

Problem with gesture in Xcode 12 and iOS 14

2 Answers2

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