gistfile1.m

- (void) viewWillAppear:(BOOL)animated {
  
  // Update Layout so Constraints are satified
  [self.view layoutIfNeeded];
  self.deviceListViewController.view.frame = self.leftBarContainerView.bounds;
  

  [self.leftBarContainerView addConstraint:[NSLayoutConstraint constraintWithItem:self.leftBarContainerView attribute:NSLayoutAttributeTop
                                                                        relatedBy:NSLayoutRelationEqual
                                                                           toItem:self.deviceListViewController.view
                                                                        attribute:NSLayoutAttributeTop
                                                                       multiplier:1.0f constant:0]];
  [self.leftBarContainerView addConstraint:[NSLayoutConstraint constraintWithItem:self.leftBarContainerView attribute:NSLayoutAttributeBottom
                                                                          relatedBy:NSLayoutRelationEqual
                                                                             toItem:self.deviceListViewController.view
                                                                          attribute:NSLayoutAttributeBottom
                                                                         multiplier:1.0f constant:0]];
  [self.leftBarContainerView addConstraint:[NSLayoutConstraint constraintWithItem:self.leftBarContainerView attribute:NSLayoutAttributeLeading
                                                                              relatedBy:NSLayoutRelationEqual
                                                                                 toItem:self.deviceListViewController.view
                                                                              attribute:NSLayoutAttributeLeading
                                                                             multiplier:1.0f constant:0]];
  [self.leftBarContainerView addConstraint:[NSLayoutConstraint constraintWithItem:self.leftBarContainerView attribute:NSLayoutAttributeTrailing
                                                                        relatedBy:NSLayoutRelationEqual
                                                                           toItem:self.deviceListViewController.view
                                                                        attribute:NSLayoutAttributeTrailing
                                                                       multiplier:1.0f constant:0]];

}