2 minute read

Tags: , ,


Expo is a framework and a platform for universal React applications. It is a set of tools and services built around React Native and native platforms that help you develop, build, deploy, and quickly iterate on iOS, Android, and web apps from the same JavaScript/TypeScript codebase.



# Install the command line tools
npm install --global expo-cli

速度開始 新專案!

expo init my-project


  • Managed workflow
    • blank a minimal app as clean as an empty canvas
    • blank (TypeScript) same as blank but with TypeScript configuration
    • tabs (TypeScript) several example screens and tabs using react-navigation and TypeScript
      # - yarn start # you can open iOS, Android, or web from here, or run them directly with the commands below.
      # - yarn android
      # - yarn ios # requires an iOS device or macOS for access to an iOS simulator
      # - yarn web
  • Bare workflow
    • minimal bare and minimal, just the essentials to get you started
    • minimal (TypeScript) same as minimal but with TypeScript configuration
      # - yarn android
      # - yarn ios # you need to use macOS to build the iOS project - use managed workflow if you need to do iOS development without a Mac
      # - yarn web
      # 💡 You can also open up the projects in the ios and android directories with their respective IDEs.
      # 🚀 expo-updates (​https://github.com/expo/expo/blob/master/packages/expo-updates/README.md​) has been installed in your project. Before you do a release build, you'll need to configure a few values in Expo.plist and AndroidManifest.xml in order for updates to work.
  Managed Workflow Bare Workflow
blank Imgur  
blank (TS) Imgur  
tabs (TS) Imgur  
minimal   Imgur
minimal (TS)   Imgur


  • With the managed workflow you only write JavaScript / TypeScript and Expo tools and services take care of everything else for you.
  • In the bare workflow you have full control over every aspect of the native project, and Expo tools and services are a little more limited.

直接 run 起來 (manged workflow: blank)

cd dir
npm start
  • 你 cmd 的視窗 會出現相關訊息 & QRcode
    • Imgur
    • 會出現網址 or 直接幫你跳一個網頁
      • Imgur
  • 拿起你的手機 掃 QRCode (請確認手機已經下載 EXPO GO)
    • Apple 直接開相機掃描
    • 安卓小夥伴 可以直接開 EXPO GO 點 Scan QR Code
      • Imgur
  • 看到 Building 的畫面
    • Imgur
  • build 成功

    • Imgur

恭喜你 生第一個 APP 出來了 可以丟 Google & Apple 了 XDDD


  • 開發電腦 & 手機要同吃一個網段唷!
  • Expo reload
    • ios
      • 三隻手指頭 常壓螢幕 會有重新整理的選項
    • android
      • 自己找 icon 會有 reload icon
    • 小呆瓜方式 QRCode 重新掃


  • 改 App loading 的圖
    • splash
      • image
      • resizeMode
      • backgroundColor
  • To Be Continue…

塞一個 WebView 完成你的 APP ! XD

  • React Native WebView

    • 安裝
      • 所有相關 react native的套件都用 expo 幫你 裝避免版本衝突地獄
      • expo install react-native-webview
        import React, { Component } from 'react';
         import { StyleSheet, Text, View } from 'react-native';
         import { WebView } from 'react-native-webview';
         // ...
         class MyWebComponent extends Component {
           render() {
             return <WebView source=\{\{ uri: 'https://reactnative.dev/' \}\} />;
  • your-react-native-expo-project/App.js

        import { WebView } from 'react-native-webview';
        export default function App() {
          // 換上你 Blog 的 url!
          return (<WebView 
            source=\{\{ uri: 'https://yuting3656.github.io/yutingblog/' \}\} />


  • 打開 expo build 出來的網頁
  • 左下角 選 Tunnel
    • Imgur
    • 會幫你開愛情的通道 讓你不用同網段也可以 快速看開發的情況唷唷~~