react-native run-ios “Could not find iPhone X simulator”

問題

這個問題發生在舊的RN版本（0.57，0.58（<0.58.4），…）和Xcode 10.3中，其中可用模擬器的名稱得到了一些調整 在文件node_modules/@react native community/cli/build/commands/runIOS/findMatchingSimulator.js中，react native嘗試通過簡單的.startsWith檢查選擇正確的模擬器。由於重命名，檢查現在應該使用.includes（ref）

Found Xcode project appupdateDemo.xcodeproj

Could not find iPhone X simulator

Error: Could not find iPhone X simulator
    at resolve (/Users/topbrids/rn_share_pro/appupdateDemo/node_modules/react-native/local-cli/runIOS/runIOS.js:149:13)
    at new Promise (<anonymous>)
    at runOnSimulator (/Users/topbrids/rn_share_pro/appupdateDemo/node_modules/react-native/local-cli/runIOS/runIOS.js:134:10)
    at Object.runIOS [as func] (/Users/topbrids/rn_share_pro/appupdateDemo/node_modules/react-native/local-cli/runIOS/runIOS.js:106:12)
    at Promise.resolve.then (/Users/topbrids/rn_share_pro/appupdateDemo/node_modules/react-native/local-cli/cliEntry.js:117:22)

解決方案

1. 跟新你的RN版本到0.58.4 +
2. 如果您無法或不會升級到新的RN版本，則可以使用以下命令自動調整findMatchingSimulator.js文件：

sed -i '' 's/startsWith/includes/g' node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

用這個命令就不用我們去node_modules下麵手動修改源碼了

還可以把這個命令 放到package.json 的 script節點下麵 指定命令 然後用npm run xx 直接執行這個命令 這樣用起來更方便一些

{
  "name": "appupdateDemo",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest",
    "fixOldRnVersion": "sed -i '' 's/startsWith/includes/g' node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js"
  },
  "dependencies": {
    "react": "16.6.1",
    "react-native": "0.57.7",
    "rn-app-upgrade": "^1.0.4"
  },
  "devDependencies": {
    "babel-jest": "24.9.0",
    "jest": "24.9.0",
    "metro-react-native-babel-preset": "0.57.0",
    "react-test-renderer": "16.6.1"
  },
  "jest": {
    "preset": "react-native"
  }
}

[topbrids@topdeMacBook-Pro appupdateDemo]$ npm run fixOldRnVersion

> [email protected] fixOldRnVersion /Users/topbrids/rn_share_pro/appupdateDemo
> sed -i '' 's/startsWith/includes/g' node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js