Custom init for UIViewController in Swift with interface setup in storyboard

Question

I\'m having issue for writing custom init for subclass of UIViewController, basically I want to pass the dependency through the init method for viewController rather than se

Answer 1

One way that I've done this is with a convenience initializer.

class MemeDetailVC : UIViewController {

    convenience init(meme: Meme) {
        self.init()
        self.meme = meme
    }
}

Then you initialize your MemeDetailVC with let memeDetailVC = MemeDetailVC(theMeme)

Apple's documentation on initializers is pretty good, but my personal favorite is the Ray Wenderlich: Initialization in Depth tutorial series which should give you plenty of explanation/examples on your various init options and the "proper" way to do things.

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EDIT: While you can use a convenience initializer on custom view controllers, everyone is correct in stating that you cannot use custom initializers when initializing from the storyboard or through a storyboard segue.

If your interface is set up in the storyboard and you're creating the controller completely programmatically, then a convenience initializer is probably the easiest way to do what you're trying to do since you don't have to deal with the required init with the NSCoder (which I still don't really understand).

If you're getting your view controller via the storyboard though, then you will need to follow @Caleb Kleveter's answer and cast the view controller into your desired subclass then set the property manually.