In my previous post I gave a very high level overview of what Xamarin is and what Xamarin is not. Though my post was more conversational and explained by example, I left out the technical details. In this post, I’m going to focus on the nuts & bolts of Xamarin.iOS. But before we start off coding a sample application, it is (in my opinion) essential to understand what Xamarin.iOS is, how it is compiled, and how it executes on your iOS device. Though it is easy to jump right in and start coding, I believe it is essential to understand the Xamarin.iOS fundamentals, as well as the iOS operating system fundamentals. In the long run, this will be beneficial when you have to start debugging your apps. It will also help you troubleshoot issues and understand what is happening between the iOS operating system, Xamarin.iOS, and your own code.