Swift: Custom ViewController initializers

Question

How do you add custom initializers to UIViewController subclasses in Swift?

I've created a sub class of UIViewController that looks something like this:

class MyViewController : UIViewController {     init(leftVC:UIViewController, rightVC:UIViewController, gap:Int)     {         self.leftVC = leftVC;         self.rightVC = rightVC;         self.gap = gap;          super.init();          setupScrollView();         setupViewControllers();     } } 

When I run it I get a fatal error:

fatal error: use of unimplemented initializer 'init(nibName:bundle:)' for class 'MyApp.MyViewController'

I've read elewhere that when adding a custom initializer one has to also override init(coder aDecoder:NSCoder) so let's override that init and see what happens:

override init(coder aDecoder: NSCoder) {     super.init(coder: aDecoder); } 

If I add this, Xcode complains that self.leftVC is not initialized at super.init call. So I guess that can't be the solution either. So I wonder how can I add custom initializers properly to a ViewController subclass in Swift (since in Objective-C this seems not to be a problem)?

Answer 1

Solved it! One has to call the designated initializer which in this case is the init with nibName, obviously ...

init(leftVC:UIViewController, rightVC:UIViewController, gap:Int) {     self.leftVC = leftVC     self.rightVC = rightVC     self.gap = gap      super.init(nibName: nil, bundle: nil)      setupScrollView()     setupViewControllers() } 

Answer 2

For a more generic UIViewController you can use this as of Swift 2.0

init() {     super.init(nibName: nil, bundle: nil) }