toolbarItems not visible when presented in UIPageViewController

[hllGitHub]

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It is good to use it under normal circumstances.
But when I use UIPageViewController, the toolbarItems is gone. TOWebViewController as viewControllers.

![2017-05-10 4 22 51]

[TimOliver]

Hi there!

Hmm, a UIPageViewController? I've never tested it in that before. Do you have a sample app that you could upload here for me to test?

I don't really have time to add new features (This controller was only designed to be pushed modally, or in a UINavigationController, not in anything else), so a PR here would be mighty appreciated. :)