Workaround for iPhone 6+ horizontal size class bug (when using "present as popover" initial show comes with compact class, only after rotation it is correctly regular)

gistfile1.m

- (void)viewWillAppear:(BOOL)animated
{
	[super viewWillAppear:animated];
	
	// workaround for iPhone 6+ bug
	if (self.traitCollection.displayScale==3)
	{
		CGSize windowSize = [UIScreen mainScreen].bounds.size;
		CGSize viewSize = self.view.bounds.size;
		
		if (viewSize.width < windowSize.width)
		{
			UITraitCollection *collection = [UITraitCollection traitCollectionWithHorizontalSizeClass:UIUserInterfaceSizeClassRegular];
			[self _setupForTraitCollection:collection];
			return;
		}
	}
	
	[self _setupForTraitCollection:self.traitCollection];
}

- (void)_setupForTraitCollection:(UITraitCollection *)collection
{
	if (collection.horizontalSizeClass == UIUserInterfaceSizeClassRegular || collection.userInterfaceIdiom == UIUserInterfaceIdiomPad)
	{
		[self.navigationController setNavigationBarHidden:YES];
	}
	else
	{
		[self.navigationController setNavigationBarHidden:NO];
	}
}

- (void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
	[self _setupForTraitCollection:newCollection];
}