title: Cannot set text color of Send and Cancel buttons in the mail composer when presented from the UIActivityViewController in iOS7
body: <p>I am using the UIActivityViewController to share items in iOS7. When I tap on the Mail option, it pops up the mail composer, but the Cancel and Send buttons on the navigation bar and the navigation bar itself are blue, making it very difficult to read, so I want to change their color. It's working in iOS6 but not in iOS7.</p>
  
  <p>I tried</p>
  
  <pre><code>[[UIBarButtonItem appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor redColor], UITextAttributeTextColor, [UIColor clearColor], UITextAttributeTextShadowColor, nil] forState:UIControlStateNormal];
  </code></pre>
  
  <p>which works in iOS6, and I tried</p>
  
  <pre><code>[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];
  [[UINavigationBar appearance] setBarTintColor:[UIColor redColor]];
  </code></pre>
  
  <p>which causes the color to flash red the first time the app is run before immediately switching  back to the blue color.</p>