title: UIAlertController background color iOS10
body: <p>Code that I wrote for iOS9, worked really well:</p>
  
  <pre><code>UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Select source"
                                                                     message:nil
                                                              preferredStyle:UIAlertControllerStyleActionSheet];
      alert.view.backgroundColor = DARK_BLUE;
      alert.view.tintColor = NEON_GREEN;
      UIView *subview = alert.view.subviews.firstObject;
      UIView *alertContentView = subview.subviews.firstObject;
      alertContentView.backgroundColor = DARK_BLUE;
      alertContentView.layer.cornerRadius = 10;
  </code></pre>
  
  <p>My point of view is that <code>UIAlertController</code> is inheriting from <code>UIViewController</code>, and <code>UIViewController</code> have property <code>UIView</code> that can be changed. And this is working. Now, that view inherited from <code>UIViewController</code> have it's own subview that is contentView showed as Alert. I can access it as firstObject in array of subviews. Now, why message for sending background color isn't working anymore? Do anyone know some new solution?</p>