title: xamarin.forms, How to change app top layout
body: <p>I need to do some change in my aplication top of the ios device...
  The <em>Back</em> button is orange, but I need that it, and only it, be white...
  But when I chaged the page title to orange, it changed together...</p>
  
  <p><a href="https://i.stack.imgur.com/vzbpC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vzbpC.png" alt="enter image description here"></a></p>
  
  <p>I used this line in 'AppDelegate' to it:</p>
  
  <pre><code>UINavigationBar.Appearance.SetTitleTextAttributes(
      new UITextAttributes() { TextColor = UIColor.Orange });
  </code></pre>
  
  <p>Besides that, My statusbar is white...I changed it to black using this in appDelegate:</p>
  
  <pre><code>if (statusBar.RespondsToSelector(new ObjCRuntime.Selector("setBackgroundColor:")))
          {
              statusBar.BackgroundColor = UIColor.White;
          }
  </code></pre>
  
  <p>I can do it black, But I need it's letters be white...I searched and I can't find a answer that works...please, if you can, help me
  it's really important to me</p>