Creating bindings from a 3rd party library

I'm trying to create bindings for a 3rd-party library, https://github.com/heitorfr/ios-image-editor

I've tried going through the steps on the Xamarin docs but Objective Sharpie seems to have an issue because the Controller inherits from UIViewController so when it generates the interface it is set to inherit from UIGestureRecognizerDelegate (which is a class so the interface can't inherit it).

Since I'm fairly new to both Xamarin and Objective-C I'm not really sure how to go about fixing this, or if I wanted to create a binding by hand how to go about that instead.