title: iOS 8 move UIView up when keyboard appears | Issue
body: <p>I have a <code>UIView</code> with a <code>UITextField</code> placed at the bottom of the screen which will move up when a keyboard appears.</p>
  
  <p>I have been following the below method prior to iOS 8 and seems to work perfectly.</p>
  
  <pre><code>// When Keyboard appears
  - (void)keyboardWillShow:(NSNotification *)notification {
  
  [UIView beginAnimations:nil context:nil];
  [UIView setAnimationDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
  [UIView setAnimationCurve:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey]integerValue]];
  [UIView setAnimationBeginsFromCurrentState:YES];
  
  // Frame Update
  CGRect frame = self.bottomView.frame;
  frame.origin.y = self.view.frame.size.height - 266.0f;
  self.bottomView.frame = frame;
  
  [UIView commitAnimations];
  }
  
  // When keyboard disappears
  - (void) keyboardHides : (NSNotification *) notification {
  
  [UIView beginAnimations:nil context:NULL];
  [UIView setAnimationDuration:[notification.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
  [UIView setAnimationCurve:[notification.userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue]];
  [UIView setAnimationBeginsFromCurrentState:YES];
  
  // Frame update
  CGRect frame = self.bottomView.frame;
  frame.origin.y = self.view.frame.size.height - self.bottomView.frame.size.height;
  self.bottomView.frame = frame;
  
  [UIView commitAnimations];
  }
  </code></pre>
  
  <p>But the above code doesn't seem to work in <code>iOS 8</code> as the keyboard blocks the UIView behind it.</p>
  
  <p>After a little research, I found out an <a href="https://stackoverflow.com/questions/26213681/ios-8-keyboard-hides-my-textview/26226732#26226732">almost-similar</a> answer. But here the whole <code>UIView</code> was being pushed up, and what I would like to achieve was just to move the <code>bottom UIView</code>. </p>