Gestures Conflict on UITableView swipe to delete iOS

Question

I have a problem in my gesture recognizers. My goal is to implement using swipe to delete in my table view. But I think other gestures are conflicting with each other. I'm using this libray romaonthego/REFrostedViewController this a library for my hamburger menu and this library has a pangesture feature. I think the conflict is w/in the gestures. because when I run my code of my tableview in another project it's working.Pls help, Thank you in advance.

Answer 1

I had a similar problem, what I ended up doing is similar to TonyMkenu , but there are more recognizers that you need to allow:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

if (otherGestureRecognizer.delegate == self )
    return NO;

//if otherGestureRecognizer is swipe to delete from a UITableView cancel slide menu recognizers

if ([[otherGestureRecognizer.view class] isSubclassOfClass:[UITableView class]])
{
    NSLog(@"Allow1 %@", [otherGestureRecognizer description]);

    return YES;
}

if( [[otherGestureRecognizer.view class] isSubclassOfClass:[UITableViewCell class]] ||
[NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UITableViewCellScrollView"] ||
[NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UITableViewWrapperView"])
{
    NSLog(@"Allow&Disable %@", [otherGestureRecognizer description]);

    if(gestureRecognizer.delegate == self)
    {//cancel the slide menu recognizer

        gestureRecognizer.enabled = NO;
        gestureRecognizer.enabled = YES;
    }

    return YES;
}

NSLog(@"Deny %@", [otherGestureRecognizer description]);
return NO;

}

Answer 2

Edit: Updated for iOS 11

The other answers were helpful, but in my case the best solution was to do the logic in shouldRequireFailureOfOtherGesture like so:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    if (gestureRecognizer == self.pan) {
        return YES;
    }
    return NO;
}

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRequireFailureOfGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    if (gestureRecognizer == self.pan) {

        // iOS 10
        if ([NSStringFromClass([otherGestureRecognizer.view class]) isEqualToString:@"UITableViewWrapperView"]) {
            return YES;
        }
        // iOS 11
        else if ([otherGestureRecognizer isMemberOfClass:[UIPanGestureRecognizer class]] && [otherGestureRecognizer.view isKindOfClass:[UITableView class]]) {
            return YES;
        }
    }
    return NO;
}

This had a much better behavior in my case. I also used delaysTouchesBegan = YES on my pan gesture. Might be useful!

Answer 3

In iOS 11，hope this can help you.

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    if ([[otherGestureRecognizer.view class] isSubclassOfClass:[UITableView class]]) {
        if ([otherGestureRecognizer isKindOfClass: [UIPanGestureRecognizer class]]) {
            UIPanGestureRecognizer *otherPan = (UIPanGestureRecognizer *)otherGestureRecognizer;
            CGPoint translation = [otherPan translationInView:otherGestureRecognizer.view];
            return translation.x < 0;
        }
    }
    return NO;
}

Answer 4

First of all... check if you have this

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}

and second...

try to add this

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

    if ([gestureRecognizer.view isKindOfClass:[UITableView class]]) {
       return YES;
    } else {
       return NO;
    }
}

https://stackoverflow.com/a/14338043