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class ViewController: UIViewController {
var isHidden:Bool = false
@IBAction func clicked(sender: AnyObject) {
    isHidden = !isHidden
    UIView.animateWithDuration(0.5) { () -> Void in
        self.setNeedsStatusBarAppearanceUpdate()
    }
}
override func preferredStatusBarUpdateAnimation() -> UIStatusBarAnimation {
    return UIStatusBarAnimation.Slide
}
override func prefersStatusBarHidden() -> Bool {
    return isHidden
}
}