Using @available with stored properties : <p>I have an app that uses local notifications and supports iOS 10. I am trying to add iOS 9 support which requires me to use the old location notification API. I am trying to use @available and #available on my iOS 10 code and I can't figure out how to get my center variable to only be for devices running iOS 10. </p>

<p>When I set my target from iOS 10  to 9 I get the error message for this variable: "UNUserNotificationCenter is only available on iOS 10.0 or newer." It suggests I add "@available(iOS 10.0, *)" to my entire class which I don't want to do since there is code in this class that will be used for iOS 9. I appreciate any suggestions on how to limit my center property to just iOS 10.</p>

<pre><code>class ViewController: UIViewController, UITextFieldDelegate {

  let center = UNUserNotificationCenter.current()
  ...
</code></pre>
