Access IBOutlet from another class

Question

I am new to Swift / iOS, so please bear with me:

I am trying to access a function in one class from another class and update the name of UIImage.

In my viewcontroller class I have

class Documents: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet var UpdateImage: UIImageView

    override func viewDidLoad() {
        super.viewDidLoad()
        UpdateImage()
    }

    func UpdateImage() {
        UpdateImage.image = UIImage(named: "NewImage")
    }
}

Everything works, the image is updated to "NewImage"

Question: I can access the UpdateImage function from another class, but why does it generate an error when I try to change the image in the Documents class?

class GetChanges {

    var success = { operation:AFHTTPRequestOperation!, response:AnyObject!) -> Void in

        var MakeChange = Documents()
        MakeChange.UpdateImage()

    }
}

This generates an error in "UpdateImage.image = UIImage (named:" NewImage ") in the Documents class; "Fatal error: Zero unexpectedly found while expanding optional value"

Answer 1

, , nib/. , UpdateImage.

, :

var MakeChange = Documents()

Documents. nib/, IBOutlet UpdateImage. , nil .

- Documents, . , , .

, , , , , .

• Types () .

• , . UpdateImage . updateImageView

• . .

!

Answer 2

Contoller, iOS.

:

. nib/, IBOutlet UpdateImage

, init ViewController (.. Documents()) nib . viewController viewDidLoad. Apple:

nib . . nib, viewDidLoad() .

MakeChange.UpdateImage(), viewDidLoad. , :

class Documents: UIViewController, UITableViewDataSource, 

    UITableViewDelegate {

        @IBOutlet var UpdateImage: UIImageView
        var imageName: String?

        override func viewDidLoad() {
            super.viewDidLoad()
            updateImageView()
        }

        func updateImageView() {
            if let imageName = imageName {
                UpdateImage.image = UIImage(named: imageName)
            }
        }
    }

let documentsViewController = Documents
documentsViewController.imageName = "newImage"

documentViewController, newImage