I used Xamarin and GTK #, as well as Xamarin for code and XCode for formatting. They both pretty well work with C # to create code.
Just keep in mind that GTK # looks pretty awkward and outdated when you put it next to your own Mac app.
On the other hand, the structure of objects for Xcode forms (yes, I know that I do not use the βcorrectβ terminology ...) is a bit of a learning curve, but itβs not very difficult, and Xamarin did a nice job integrating the object model into C #, therefore, between the Apple documentation and what Xamarin provides, and er .. from StackOverflow itself, you should be able to create some neat apps.
code4life
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