title: BecomeFirstResponder in viewdidload make the views goes up in iOS 10
body: <p>i have issue with becomeFirstReponder, in iOS 9 , the views keep remain in their spot, but when i upgrade my Xcode to Xcode 8 and compile it with iOS 10, the views move to the top (out of screen) when the keyboard begins to appear.</p>
  
  <pre><code>- (void)viewDidLoad {
  [super viewDidLoad];
  
  [self.usernameTextField becomeFirstResponder];
  }
  </code></pre>
  
  <p>Is there any other solution to make the keyboard is appear without moving other element to the top?</p>