title: MFMailComposeViewController bar background color not changing in iOS7
body: <p>I'm trying to <strong>change the background color</strong> of the <code>MFMailComposeViewController</code> in <strong>iOS7</strong> but I cannot make it work.</p>
  
  <p>I'm using the following snipped:</p>
  
  <pre><code>MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
  picker.mailComposeDelegate = self;
  
  if([picker.navigationBar respondsToSelector:@selector(barTintColor)]) {
      // iOS7
      picker.navigationBar.barTintColor = READER_NAVIGATION_BAR_BACKGROUND_COLOR;
      // Set back button arrow color
      [picker.navigationBar setTintColor:READER_NAVIGATION_BAR_BACK_BUTTON_ARROW_COLOR];
  
      // Set Navigation Bar Title Color
      [picker.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObject:READER_NAVIGATION_BAR_TITLE_NORMAL_FONT_COLOR forKey:UITextAttributeTextColor]];
  
      // Set back button color
      [[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:READER_NAVIGATION_BAR_BUTTONS_FONT_COLOR, UITextAttributeTextColor,nil] forState:UIControlStateNormal];
  
  } 
  </code></pre>
  
  <p>Does anybody knows how to change the bakcground color of the <code>MFMailComposeViewController</code> in iOS7? </p>