Swift: How to change NSImage image source?

Question

I'm a newbee with XCode and Swift. Trying to simply set an image in my view in an OS X application. The image should be loaded from the web, but I think that doesn't matter.

I created a new Cocoa App, have a list view which works. In the XIB for the list row I have placed an "Image View" element and with this I can display a static image in each row.

Now I want to change the image URL when the row loads. I dragged the line from the image to my controller class, which added the @IBOutlet to the code.

This is my code of the controller class:

import Cocoa

class ListRowViewController: NSViewController {

    @IBOutlet weak var rowImage: NSImageView!

    override var nibName: String? {
        return "ListRowViewController"
    }

    override func loadView() {
        super.loadView()

        var url = NSURL(fileURLWithPath: "http://example.com/some-image.png")

        var image = NSImage(byReferencingURL: url!)

        self.rowImage.image(image)
    }

}

Now the very funny frustrating error message from the last statement (self.rowImage.image(image)) is

Cannot convert the expression's type 'NSImage' to type 'NSImage?'.

OK. What does that mean and how do I fix it? Is that somehow related to optionals? I experimented with ?'s and !'s but just can't figure out what XCode expects from me.

Answer 1

image of NSImageView is a property, you can just assign to it.

self.rowImage.image = image

And, your URL is wrong NSURL(fileURLWithPath:) is for local files. Use NSURL(string:) instead.

var url = NSURL(string: "http://example.com/some-image.png")