This tutorial explains how to run a React web app locally within an iOS application using Vite and WKWebView, providing a method to operate entirely offline without remote server calls. It guides users through creating a React app with Vite, setting up an iOS app with SwiftUI, and integrating a WKWebView to display the web app's content. The process involves using a build script to bundle the web app's final artifacts and copy them into the iOS app's resource directory. The tutorial emphasizes the importance of specific WKWebView configurations, such as allowing file access from file URLs, to ensure proper functionality. By following these steps, users can achieve offline-first apps on iOS devices, leveraging their existing web app code without relying on cloud services.