Drop down table doesn't play well with gesture recognizers.

[Cananito]

If the superview of the textfield has a gesture recognizer, interactions with the tableview will be interrupted by the gesture recognizer.

Current workaround:

1. Set yourself as the gesture recognizer's delegate.
2. Implement gestureRecognizer:shouldReceiveTouch:.
3. Add this pseudo implementation:

if ([self.dropDownTextField isFirstResponder]) {
    CGPoint touchPoint = [touch locationInView:self.dropDownTextField];

    if (CGRectContainsPoint(self.dropDownTextField.dropDownTableView.frame, touchPoint)) {
        return NO;
    }
}