How to set a background image in Xcode using swift?

Question

How can I set a background image for my main view controller in Xcode 6 using swift? I know that you can do this in the assistant editor as below:

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Answer 1

override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor(patternImage: UIImage(named: "background.png"))
}

Answer 2

SWIFT 4

view.layer.contents = #imageLiteral(resourceName: "webbg").cgImage