CODEWITHSUNDEEP
iosswift
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Reputation: 2120

Swift: Change Type of View Controller to Something Other than UIViewController

I'm, relatively, a beginner, so this may be an entirely common practice—or an entirely impossible one—but I've been wondering if it's possible to modify a view controller added in a storyboard so that instead of (or in addition to?) being an instance of UIViewConroller, it's also an instance of (blahblah)ViewController, e.g. ABUnknownPersonViewController.

That way, instead of doing something like this: 

class ViewController : UIViewController { 

    override func viewDidLoad() {
        let test = ABUnknownPersonViewController() 
        ...
        self.presentViewController(test, animated: false, completion: nil) 

    }

}

This could be done: 

class ViewController : ABUnknownPersonViewController { 

    override func viewDidLoad() { 

         //ViewController already is an ABUnknownPersonViewController, so you can treat it as one 
         //example below (displayedPerson is a property of ABUnkownPersonViewControllers)
         self.displayedPerson...

    }

}

EDIT: ABUnknownPersonViewController is a class supplied by Apple, which does not support subclassing (here). With that said, and the understanding that I would obviously like as simple a solution as possible (avoidance of protocols and whatnot), what are my options?

I tried class FourthViewController: UIViewController, ABUnknownPersonViewController, ABUnknownPersonViewController, ABUnknownPersonViewControllerDelegate only to get an error about multiple inheritance.

Upvotes: 2

Views: 1562

Answers (1)

Angela
Angela

Reputation: 3110

It sounds like what you actually want to do is to subclass UIViewController, and in your storyboard, set the custom class to your subclass. When the view controller is loaded from the storyboard, it will be an instance of your subclass.

So your subclass would look like this:

class ABUnknownPersonViewController : UIViewController { 

    override func viewDidLoad() { 
         self.displayedPerson...

    }

}

In the storyboard, highlight the view controller you want to use a custom class for, and in the Custom Class field, type the name of your subclass. If you've done it correctly, it should autocomplete for you.

enter image description here

Upvotes: 3

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