managing iboutlets in base view controller - ios

Question

Every UIViewController of my app is using the UITextField delegates, like:
- (void)textFieldDidBeginEditing:(UITextField*)textField {
self.responder = textField;
}
- (BOOL)textFieldShouldReturn:(UITextField*)textField {
double elementYPosition = self.responder.frame.origin.y;
double elementHeight = self.responder.frame.size.height;
double scrollYPosition = self.scrollView.contentOffset.y;
/* some logic */
}
Now I'm trying to create a base view controller, so I can inherit use it all around, reusing the methods. The responder property in the base view controller works just fine, because the UITextField delegate set its value, but the scrollview is a IBOutlet, and I'm not really sure how to design this base class:
#import "ViewControllerBase.h"
#interface ViewControllerBase ()
#property (weak, nonatomic) UIView* responder;
#property (weak, nonatomic) IBOutlet UIScrollView *scrollView; /* ??? */
#end
#implementation ViewControllerBase
-- methods
#end

Answer 1

In the subclass header:
#property (weak, nonatomic) UIScrollView *scrollView;
In the subclass load method:
self.scrollView = (UIScrollView *)self.view.subviews[0];
But it only works because my view controllers are always in the following format:
UIViewController (self)
UIView (self.view)
UIScrollView (self.view.subviews[0])
UILabel
UIElement
UIElement
UIElement