title: Switching back to the standard keyboard for UITextField with custom InputView (monotouch)
body: <p>I'm using a custom input view on a UITextField by setting its InputView property; it works great.</p>
  
  <p>However, in certain conditions I need to switch back to the standard keyboard input. Intuitively, I'm trying to set InputView property to null, but this doesn't work - an exception is thrown.</p>
  
  <p>Looking at UITextField.InputView implementation, it starts like this:</p>
  
  <pre><code>public void set_InputView(UIView value)
  {
    if (!value)
    {
      throw new ArgumentNullException(value);
    }
  ...
  </code></pre>
  
  <p>So, it is obvious that setting InputView to null is no-go ...</p>
  
  <p>Does anybody know how it can be done?</p>
  
  <p>Thank you</p>