Swift - "use of unresolved identifier"
<p>I am studying Swift!
I want create Main interface on xib.
But have error "use of unresolved identifier".</p>

<p><a href="https://i.stack.imgur.com/SOdLr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SOdLr.png" alt="enter image description here"></a></p>

<p>Add code from <code>MainViewController</code></p>

<pre><code>import Foundation

public class MainViewController : BaseViewController {

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        // TODO: Write your test code here
        // ...
    } }
</code></pre>

<p>UPD:(Add image)
<a href="https://i.stack.imgur.com/NHODh.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NHODh.png" alt="enter image description here"></a></p>