I think you forgot to call the mainViewController's viewDidLoad in SlideMenuController.swift

I noticed my main viewcontroller's `viewWillAppear` method was being called before its `viewDidLoad` method, so I checked in `SlideMenuController.swift` and noticed that you manually call `mainViewController's` `viewWillAppear` method in the corresponding `SlideMenuController` method. is this something you intended?

Start in SlideMenuController.swift, focusing on the SlideMenuController lifecycle method that manually calls the main view controller’s viewWillAppear. Reproduce or inspect the reported ordering between viewWillAppear and viewDidLoad; done means the lifecycle sequence no longer exhibits the reported problem and is verified on iOS.

Written by the indexing model from the issue text.