title: Not showing next/previous button using IQKeyboardManagerSwift
body: <p>I am using IQKeyboardManagerSwift in my application. I can not see next/previous button to toolbar. I attached screen shots of my aliments.</p>
  
  <pre><code>IQKeyboardManager.shared.enable = true
  IQKeyboardManager.shared.enableAutoToolbar = true
  IQKeyboardManager.shared.toolbarPreviousNextAllowedClasses = [UIView.self, UIStackView.self]
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/Ybb3g.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ybb3g.png" alt="enter image description here"></a></p>
  
  <p>Please help me.</p>