Missing argument for parameter 'coder' in call in Swift

Question

class SecondViewController:UIViewController {
  required init(coder aDecoder: NSCoder){
    super.init(coder: aDecoder)
    //Custom logic here
  }
}

Quite a newbie question:

a view controller(SecondViewController), inherent from UIViewController needs a designated init function like above.

In this case, how should I call it, given I am not sure what the value for "coder" should be? I used to call the controller as: SecondViewController(), but it gives:

Missing argument for parameter 'coder' in call

I understand coder parameter has to be provided, but want to ask what its value comes from.

Hossam Ghareeb · Accepted Answer · 2016-08-31 11:24:29Z

7

Thanks for the answers from @Chackle. Finally the solution I figured out is below.

What I want:

Inherit my SecondViewController from UIViewController
Simply to initialize any new SecondViewController as SecondViewController()

Solution:

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    init() {
        super.init(nibName: nil, bundle: nil)
        //Do whatever you want here
    }

"required init(coder aDecoder: NSCoder)" is a must if you create a subclass of UIViewController. And so is "super.init(nibName: nil, bundle: nil)", because it is the way how UIViewController does initialization.

edited Aug 31, 2016 at 11:24

Hossam Ghareeb

7,1233 gold badges56 silver badges65 bronze badges

answered May 20, 2015 at 3:20

aquajach

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