Call a function in a UIViewController's UIView

Question

I've created a view controller and the associated view using the interface builder. I'm trying to call a function that I added to the UIView from the UIViewController. I'm not sure how to call that function though.

I've tried

 [self.view myFunction]

but that just makes my program crash.

Answer 1

How is the view getting initialized? Is it a custom view type? If your view is being initialized from a nib, make sure that the class on the view type is the class that has the method implemented.

Answer 2

Did you declare your IB outlets and connect the method to it?

Your view (more accurately nib)'s file owner should be set to your viewController class.

Unless your calling drawing functions and methods you shouldn't call anything on the view. You just don't need to.

Edit: grammar corrections.

Answer 3

It is probably crashing because UIView does not have a method named myFunction. In order to add myFunction to a UIView object, you need to subclass it.

I assume you have subclassed your UIView, and called it something like MyView. You also probably have subclassed your UIViewController and called it MyUIViewController. Therefore you may have:

@interface MyViewController : UIViewController {
    MyView *myView;
....
}

Now you can call [self.myView myFunction];

That's one way. Another way may be:

[(MyView *)self.view myFunction];

This depends on whether myView is the first view in the hierarchy (or should be set up in your NIB files).