CODEWITHSUNDEEP
xcodeswiftuiviewcontrollersubclassinit
Michael Kornelakis
Michael Kornelakis

Reputation: 411

Custom init while creating view with storyboard or programmatically

I am trying to create a subclass of UIViewController and then through the storyboard or programmatically pass data to it. What I have tried so far is to have a subViewController swift file with a class subViewController that is a UIViewController

import UIKit

class subViewController: UIViewController {

    var s1 = String()

    init(myString: String) {

        self.s1 = myString
        super.init(nibName: nil, bundle: nil)
    }

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

    @IBOutlet var label: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        print(self.s1)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

then in Identity Inspector I connect this to the view controller

and in AppDelegate.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

    let SubVC = subViewController(myString: "Komic")

    self.window?.rootViewController = SubVC

    self.window?.makeKeyAndVisible()
    return true
}

This loads a black screen but it logs out myString. As far as I understand it doesn't create the view but it just creates the instance of the class and that's why it's giving me the black screen. I also know that this part

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

runs when the storyboard gives you the view. But I can't pass data in there that's why I am trying to do this programmaticaly. Is it possible somehow to do that? I know I could instantiateWithIdentifier with the storyboard but I can't find a way to pass my data through that....any help?

Upvotes: 2

Views: 1981

Answers (2)

Tulleb
Tulleb

Reputation: 9206

An (ugly) way to solve this issue:

You can set your var s1 from an external buffer in your code (AppDelegate variable in this example)

required init?(coder aDecoder: NSCoder) {
    self.s1 = UIApplication.shared().delegate.bufferForS1

    super.init(coder: aDecoder)
}

And when you initiate your UIViewController through Storyboard:

UIApplication.shared().delegate.bufferForS1 = myS1Value
self.navigationController!.pushViewControllerFading(self.storyboard!.instantiateViewController(withIdentifier: "myViewControllerID") as UIViewController)

Upvotes: 2

Luke De Feo
Luke De Feo

Reputation: 2165

You are not loading the view controller from the storyboard when you call your custom initialiser, if you create a customer initialiser it is your responsibility to create the view hierarchy programatically - typically in loadView() although lots of people do it in viewDidLoad().

In Order to the load the view hierarchy you defined in the storyboard you can do this:

let storyBoard = UIStoryboard(name: "storyboardName", bundle: NSBundle.mainBundle())
let viewController = storyBoard.instantiateViewControllerWithIdentifier("storyboardId")

You define the storyboard Id of a view controller in the identity inspector

Upvotes: -1

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