c# - Unable to subclass NSTextStorage -


i'm using xamarin + textkit create editor syntax highlighting feature. when try add layoutmanager custom nstextstorage, crash app following message:

xamarin.ios: received unhandled objectivec exception: nsinvalidargumentexception *** -string defined abstract class. define -[thomas_editor_syntaxrenderer string]! 

i try [export("***")] override methods of custom class keep crashing app. don't know fix bug.

can tell me how fix problem? had uploaded sample code on gist.


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