marcuswestin/WebViewJavascriptBridge ? reverse-engineered prompt

Build me an Objective C library for iOS and macOS that lets a native app talk back and forth with JavaScript inside a web view. I want it to work with the common Apple web views, and I want both sides to be able to register named handlers and call each other with optional responses. Please include a simple example app I can run to see messages going from JavaScript to Objective C and back, plus a basic test setup if that makes sense. Also make it easy to drop into a project or install with CocoaPods, and include the JavaScript snippet needed to set up the bridge in a page. If there are any tricky web view lifecycle details or timing issues, handle those cleanly so it feels reliable and easy to use.