CODEWITHSUNDEEP
iosswiftviewcontrollerarkit
Caddarina
Caddarina

Reputation: 21

Pass data from ViewController to class

I'm quite new to Swift and I'm struggling with this issue. I want to pass the size and point of squareImage to a different swift file in my project using setSquareRec.

View Controller:

class ViewController: UIViewController, SceneDelegate {

    @IBOutlet var squareImage: UIImageView!

    var scene = Scene()

    func setSquareRec() {
        scene.x = Int(squareImage.bounds.minX)
        scene.y = Int(squareImage.bounds.minY)
        scene.width = Int(squareImage.bounds.width)
        scene.height = Int(squareImage.bounds.height)
    }

    ...

}

The class:

protocol SceneDelegate{
    func setSquareRec()
}

class Scene: SKScene {

    var width = 0
    var height = 0
    var x = 0
    var y = 0

    ...

    let ARViewController = ViewController()
    ARViewController.setSquareRec()

}

It gives me the error Thread 5: Fatal error: Unexpectedly found nil while unwrapping an Optional value in the first line ( scene.width = Int(sqareImage.bounds.minX) ) of the function setSquareRec

How is it possible that is has no value?! And how is it possible to pass it to another class? I looked at so many solutions but none of them worked or I don't get it.

Upvotes: 2

Views: 548

Answers (2)

Khushal Dugar
Khushal Dugar

Reputation: 231

The way you are using your delegate is wrong infact you are not using the delegate itselg. Kindly look at the approach below.

import UIKit

class ViewController: UIViewController, SceneDelegate {

    @IBOutlet var squareImage: UIImageView!

    var scene = Scene()

    override func viewDidLoad() {
        super.viewDidLoad()

        //set delegate for scene as this delegate
        scene.sceneDelegate = self
    }

    func setSquareRec() {
        scene.x = Int(squareImage.bounds.minX)
        scene.y = Int(squareImage.bounds.minY)
        scene.width = Int(squareImage.bounds.width)
        scene.height = Int(squareImage.bounds.height)
    }
}

protocol SceneDelegate{
    func setSquareRec()
}

class Scene: SKScene {

    var width = 0
    var height = 0
    var x = 0
    var y = 0
    var sceneDelegate: SceneDelegate?

    ...
    //call this delegate method like this
    //This will call the setSquareRec method to any class who is set as delegate
    sceneDelegate.setSquareRec()
    ...
}

not tested kindly test let me know incase of any issue

Upvotes: 1

Arthur
Arthur

Reputation: 410

You instantiate your view controller with let ARViewController = ViewController().

Try inflating it from a storyboard.

Feel free to ask if it isn't clear.

Upvotes: 1

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