Today Microsoft has released a new version of Visual Studio to add support for Xcode 9.2
This is a FUNDAMENTAL update for Visual Studio and Xamarin as with the old version you cannot compile code for Apple (you can read the article here).
Let’s see now the complete Release notes:
C:\Windows\tempfills up with .itrace files after upgrade to 15.5.6.
vstest.console.exefails test run with socket exception.
There are a couple of important issues fixed in this release but definitely the support for Xcode 9.3 is the most important feature of this update.
You can update Visual Studio going on Help -> Check for Updates
or you can install Visual Studio from here: https://www.visualstudio.com/downloads