How to grab the value of a WebView in Swift - swift

Question

Suppose I have a label that is a NSTextField. I know I can access the value of that label by:
#IBOutlet weak var label: NSTextField!
let labelValue = label.stringValue
And then I can use that variable accordingly.
The same is easily said for an NSImage:
#IBOutlet weak var productImageView: NSImageView!
let img = productImageView.image
My question is how do I grab the value of a WebView. I am unsure which property allows me to use a WebView.
#IBOutlet weak var videoTemp: WebView!
let videoPassed = videoTemp //how do I access this videoTemp's value much like .stringValue and .image
I am trying to load dynamic video URL's to Youtube videos when I click on a collection view item. The line that I have commented in my setupAppVideo method is where my fatal error occurs:
"fatal error: unexpectedly found nil while unwrapping an Optional value"
but when I print out the url and request variables their are no nil values and all of them are the correct links in the console.
import Cocoa
import WebKit
class test1: NSCollectionViewItem {
#IBOutlet weak var label: NSTextField!
#IBOutlet weak var label2: NSTextField!
#IBOutlet weak var productImageView: NSImageView!
#IBOutlet weak var videoTemp: WKWebView!
var buildProduct: ProductModel? {
didSet{
label.stringValue = (buildProduct?.product_name)!
label2.stringValue = (buildProduct?.product_price)!
setupAppIconImage()
setupAppVideo()
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
func setupAppIconImage() {
if let appIconImageURL = buildProduct?.product_image {
let url = NSURL(string: appIconImageURL)
URLSession.shared.dataTask(with: url! as URL,completionHandler:{(data, response, error) in
if error != nil {
print(error)
return
}
DispatchQueue.main.async(){
self.productImageView.image = NSImage(data: data!)
}
}).resume()
}
}
func setupAppVideo(){
if let appVideoURL = buildProduct?.product_video{
let url = NSURL(string: appVideoURL)
print(url)
let request = NSURLRequest(url: url as! URL)
print(request)
//self.videoTemp.load(request as URLRequest)
}
}
}