Auto layout in camera overlay mode - cannot center button vertically

I am trying to add an overlay to a camera. For this, I created the following event method:

- (IBAction)takePhoto:(id)sender {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];

if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
    [imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
    imagePicker.showsCameraControls = NO;
    imagePicker.navigationBarHidden = YES;
    imagePicker.toolbarHidden = YES;
    imagePicker.wantsFullScreenLayout = YES;

    // Overlay
    // Insert the overlay

    self.overlay = [[OverlayViewController alloc] initWithNibName:@"OverlayView" bundle:nil];
    //[self.overlay.view setTranslatesAutoresizingMaskIntoConstraints:NO];
    self.overlay.pickerReference = imagePicker;
    imagePicker.cameraOverlayView = self.overlay.view;
    imagePicker.delegate = self.overlay;

    [self presentViewController:imagePicker animated:NO completion:nil];
} else{
    [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
    [imagePicker setDelegate:self];
    [self presentViewController:imagePicker animated:YES completion:nil];
}
}

      

        
        
        
      

    

The button is centered like this.

But it looks like an iPhone 4 in use. It is not vertically centered. If I try to connect the Slikaj button to the bottom, it is not visible because the screen size of the iPhone 4 is smaller than the iPhone 5. The "Use automatic layout" checkbox is checked (enabled). What am I doing wrong?