Use Bridging-header Watch app

Create an Objective-C bridging header file, and then in you project settings, go to the watch extension target, and click "build settings." For the filter at the top, make sure 'All' is selected, not 'Basic.' Then look for the the subheading 'Swift Compiler - Code generation' and you can see where you can enter the Objective-C Bridging Header. Enter the path to your header here. Make sure to import the header files into your bridging header file for any objective-c code that you would like to call