I am using AppCode 2017.2, Build #OC-172.3317.89, built on July 20, 2017, Mac OS X 10.12.4.
I use the auto-layout DSL Stevia (https://github.com/freshOS/Stevia) which extends (not sure how, but I guess through extensions) all UIViews with methods and fields. In the version of AppCode that I run the methods on the views are not found and produce an error. This code does not generate errors in the stable branch of AppCode.
AppCode 2017.1.3, Build #OC-171.4694.27, built on June 7, 2017:
the openChartsIcon is just an ordinary UIImageView that is extended by the Stevia import.