Rotation with AutoLayout

Question

I'm beginner in Xcode and I'm using ios6 with autolayout.

I would like to rotate my uiviewcontroller from:

to:

I would like to prevent my bottom bar from rotating. Something very similar to Apple's camera app rotation, but whats going wrong is that everything rotates.

I tried to put some code like

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{   
    // [Bar setTransform:CGAffineTransformMakeRotation(M_PI / -2.0)];
    // [Bar setTranslatesAutoresizingMaskIntoConstraints:YES];
}

Answer 1

I don't know how to achieve it by IB, but you can do that by adding specific constraints through code:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
  if (UIInterfaceOrientationIsPortrait(toInterfaceOrientation)) {
    [self.view removeConstraints:landscapeConstraints];
  } else {
    [self.view addConstraints:landscapeConstraints];
  }
}