Reasons why a website might not appear on webview?

Question

I'm trying to make a web view in an app. I've managed to do one, however I'm having trouble with the other. I used the exact same code for both however it doesnt work for the second one. Are there any reasons why it works for one but not the other?

Here is my code:

@IBOutlet var webView: UIWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    let url = NSURL (string: "https://acorn.utoronto.ca/")
    let requestObj = NSURLRequest(URL: url!)
    webView.loadRequest(requestObj)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}