title: iOS 7 keyboard issue
body: <p>I am using iOS 7 for my application. In my app I have changed keyboard appearance to '<code>UIkeyboardApperanceAlert</code>'. It makes keyboard black. But problem is when app comes from background to foreground, whenever I click in <code>textField</code> it first opens keyboard with white color and then it's color turns to black.</p>
  <p>Why this is happening?</p>