How to get stepper and longpress to coexist?

Question

I tried setting up a view with a longpress gesture and a stepper configured for continuous updates. With the longpress, the continuous feature of the stepper does not occur. For now, I've disabled the longpress. I guess I don't need it. But for future reference, how would I allow for both to coexist?

Just to be clear, here is the way the screen was set up when I tried this.

• App was set up with a simple view controller.
• A subview was added to this view (could have been a controller, but I just made it a UIView).
• Several labels and stepper were added to this subview.
• The steppers were wired up as outlets and actions.
• A longpress recognizer was added to the main view in IB.
• For completeness, a tap gesture was also added to the main view in IB.

Taps on the main view function as expected. Taps on the steppers function as expected. Longpress on the main view functions as expected. Longpress on the stepper does not.

I modified the code called by the longpress to check for the frame of the subview and not act if the touch location was within that rectangle, but that didn't make a difference. I did not try getting the longpress to fail in that situation, but I suppose I'll try that next. EDIT: OK, maybe not. There doesn't seem to be an API for that. However, there is this kludge, that I'm not going to try.

Attached is a screen shot from profiler with an inverted call tree so you can see what each item is being called by.

darkStepped: is the IBAction that is called by the stepper. If the stepper were triggered by a gesture recognizer, wouldn't I expect to see the gesture recognizer in the call tree?

Answer 1

After carefully reviewing Apple's docs again, I've found the solution. I added the view controller as the delegate to the longpress gesture recognizer

self.longPress.delegate = self;

(and, of course, adding <UIGestureRecognizerDelegate> to the interface, and then added this method to the view controller:

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
   // Determine if the touch is inside the custom subview
   if (gestureRecognizer == self.longPress) {
      CGPoint touchLocation = [touch locationInView:self.view];
      if (CGRectContainsPoint(self.antControl.frame, touchLocation)) {
         return NO;
      }
   }
   return YES;
}

This way the gesture recognizer doesn't even get called when the longpress occurs within the frame of self.antControl, which is the subview mentioned in the question.