How to create uialertcontroller in global swift
<p>I'm trying to create <code>uialertcontroller</code> in <code>Config.swift</code> file as follow.</p>

<pre><code>static func showAlertMessage(titleStr:String, messageStr:String) -&gt; Void {
    let window : UIWindow?
    let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
    self.window!.presentViewController(alert, animated: true, completion: nil)
}
</code></pre>

<p>problem is I've found problem in <code>self.window!.</code></p>

<blockquote>
  <p>Type 'Config' has no member 'window'</p>
</blockquote>

<p>Please let me know how to solve that issue.</p>