Swift: Add Shadow To UIButton

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func viewDidLoad() {
    super.viewDidLoad()

    // make the shadow
    myButton.layer.shadowOffset = CGSizeMake(5, 5)

    // set the radius
    myButton.layer.shadowRadius = 5

    // change the color of the shadow (has to be CGColor)
    myButton.layer.shadowColor = UIColor.blueColor().CGColor
    
    // display the shadow
    myButton.layer.shadowOpacity = 1.0
}