PreviewControllerHideBottomButtons

###Description Repo demonstrates how to remove UIToolbar buttons on QLPreviewController.

###Steps:

1. Subclass UIToolbar
2. Create UINavigationController using init(navigationBarClass:toolbarClass:) and supply UIToolbar subsclass created in step 1 for toolbarClass
3. Inside of UIToolbar subsclass override setItems(_:animated:). To remove all buttons call super with empty array super.setItems([], animated: false) or potentially you can add only buttons you want to keep.

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Clone and run example to see it in action.