Ios – UITableview didSelectRowAtIndexPath supercedes double tap gesture by UITapGestureRecognizer

iosiphoneuigesturerecognizeruitableview

I've set up a UITableView with a double-tap UITapGestureRecognizer. But attempts to double-tap a cell by the user just launches didSelectRowAtIndexPath twice. Are these two supposed to work together?

(i'm aware i could use a single tap gesture recognizer in place of the built-in behavior of didSelectRowAtIndexPath, but here's the problem with that: the cell also has a button that I can't press anymore when i add the single tap gesture recognizer. Also, I've seen examples on SO of users building double tap functionality into didSelectRowAtIndexPath, but isn't that a bit too much of a hack?)

Best Answer

More info about Kris' answer:

cancelsTouchesInView
delaysTouchesBegan
delaysTouchesEnded

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIGestureRecognizer_Class/Reference/Reference.html

In my case I had a problem when adding 2 tap gestures to a UIImageView that was on a custom UITableViewCell. What happened was the didSelectRowAtIndexPath: was called when you tap/double tap on the UIImageView. When I had only one tap gesture, the didSelectRowAtIndexPath: was not called (and for me, that was the right behavior.

To prevent the didSelectRowAtIndexPath: from being called when using two tap gestures (single/double tap), I added this code to the first tap gesture (the single one):

tapGesture.cancelsTouchesInView = YES;
tapGesture.delaysTouchesBegan = YES;

After this change, a tap/double on the UIImageView (on top of the custom cell) did not trigger the didSelectRowAtIndexPath:

Related Solutions

Ios – How to disable the UITableView selection

All you have to do is set the selection style on the UITableViewCell instance using either:

Objective-C:

cell.selectionStyle = UITableViewCellSelectionStyleNone;

[cell setSelectionStyle:UITableViewCellSelectionStyleNone];

Swift 2:

cell.selectionStyle = UITableViewCellSelectionStyle.None

Swift 3 and 4.x:

cell.selectionStyle = .none

Further, make sure you either don't implement -tableView:didSelectRowAtIndexPath: in your table view delegate or explicitly exclude the cells you want to have no action if you do implement it.

More info here and here

Ios – UIButton inside a view that has a UITapGestureRecognizer

You can set your controller or view (whichever creates the gesture recognizer) as the delegate of the UITapGestureRecognizer. Then in the delegate you can implement -gestureRecognizer:shouldReceiveTouch:. In your implementation you can test if the touch belongs to your new subview, and if it does, instruct the gesture recognizer to ignore it. Something like the following:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    // test if our control subview is on-screen
    if (self.controlSubview.superview != nil) {
        if ([touch.view isDescendantOfView:self.controlSubview]) {
            // we touched our control surface
            return NO; // ignore the touch
        }
    }
    return YES; // handle the touch
}

Best Answer

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