Question

I have an UIView high 30, than i add an UITableView as subview with 30 as origin.y. Because the table remains “under” the main view I cannot select the cells. Consequently I have implemented this method:

 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Tocco intercettato");
    if (oldSet && oldEvent) {
        [table touchesEnded:oldSet withEvent:oldEvent];
    }
    oldSet = touches;
    oldEvent = event;
    [table touchesBegan:touches withEvent:event];
    [table touchesEnded:touches withEvent:event];
    }

The taps work, but the slides does not work and consequently I cannot slide the table. Some idea in order to resolve?

Answer 1

Passing the touches from an overlying UIView to an underlying UITableView does not work (as you’re seeing, the taps go through but not the scrolling movements). This is because UITableView (as a subclass of UIScrollView) does all sorts of under-the-hood weirdness with the responder chain (your code is also kind of odd, where you call both touchesBegan and touchesEnded from the overlying view’s touchesBegan method, but this isn’t why you can’t scroll the table).

A simple way to achieve what you want (assuming I’ve understood that correctly) is to override the hitTest:withEvent: method on your overlying view and have the method return the underlying UITableView (instead of self, which is the default implementation):

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UITableView *tv = (UITableView *)[self.superview.subviews objectAtIndex:0];
    return tv;
}

Note that this code assumes the UITableView is the first view added to your view controller, and that the overlying UIView is added after that.

Edit: OK, after re-reading your question, I think I understand your question. You have a main view with a height of 30, and to that view you’ve added a UITableView at y = 30. I think adding this method to your main view will do what you need:

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if (point.y < self.frame.size.height) {
        return self;
    } else {
        return myTableView; // assumes myTableView is a reference to the
                            // UITableView that you've added
    }
}

Essentially, you’re telling the OS to pass all touches on to myTableView if they’re outside the bounds of your main view.

However, a simpler way would be to add both the 30-pixel-high main view (the orange thing) and the UITableView as subviews of another view (or view controller). That way, you wouldn’t have to do anything kludgy to get your table to behave like a normal table.