You can bind Objective C based Cocoapods to xamarin and its officially supported (https://developer.xamarin.com/guides/ios/advanced_topics/binding_objective-c/walkthrough/)
- you have to find the github repo of the cocoapod and convert that into a static library(.a) file
- you have to use that static library to create binding library in Xam studio
then you are good to use in xamarin.ios
But swift based library is not officially supported in Xamarin.So you can't use Swift based cocoapods directly in xamarin as you do But there are workarounds
You can bridge the Swift framework to C# using Objective C i.e expose the Swift APIs using Objective C and convert that into .a static library and then binding library
Try porting the Swift to C# and it should be faster as well
As Stephane Delcroix quoted
Look if there are any existing monotouch bindings available here before starting to port