Question

I have table view with button. I have added UIPanGestureRecognizer to button to allow user to move button horizontally. But then vertical scroll of whole table view does not work now when user touches the button. If I don’t use gesturerecognizer, vertical scroll works ok. How to allow users to move button horizontally and table view vertically?

Answer 1

When you intercept the gesture recoginition, you are blocking the UITableView to get notified about the gesture event. To deal with this, in the same place (method) that you recognize a gesture, do a comparison. If it is a horizontal gensture (e.g. horizontal pan), do whatever you want to do, otherwise, pass it along the chain, so that the table view gets a chance to respond to it.

EDIT

It depends what methods you have, and what methods you have overriden. Once you recognized the touch event. Here is an example:

-(void)respondToEvent:(UIEvent *)event {
       if (event == horizontalPan)
          [self handleEvent:event];
       else
          [super respondToEvent:event];
}

You should call the same method on the next responder (or super).

References:

1. https://developer.apple.com/library/ios/#DOCUMENTATION/EventHandling/Conceptual/EventHandlingiPhoneOS/EventsiPhoneOS/EventsiPhoneOS.html#//apple_ref/doc/uid/TP40009541-CH2-SW5

2. https://developer.apple.com/library/ios/#documentation/uikit/reference/UIResponder_Class/Reference/Reference.html#//apple_ref/occ/cl/UIResponder

3. http://books.google.com/books?id=rk1EEL4WpFEC&lpg=PP1&pg=PA530#v=onepage&q&f=false