title: Podfile.lock missing when initial react-native run-ios
body: <p>I am setting up IOS dev for React Native (0.61) app which has the working android version. What I did was to copy src of components and package.json file after react native environment is setup by following online post (installed xcode command line tool 10.2). But launching run-ios failed:</p>
  
  <pre><code>$ react-native run-ios
  error Could not find "Podfile.lock" at /Users/mine/Documents/code/js/emps_fe6/ios/Podfile.lock. Did you run "pod install" in iOS directory?
  error Could not find the following native modules: RNCAsyncStorage, RNDeviceInfo, RNGestureHandler, RNKeychain, BVLinearGradient, RNLocalize, RNReanimated, RNVectorIcons, react-native-video. Did you forget to run "pod install" ?
  info Found Xcode project "emps_fe6.xcodeproj"
  xcrun: error: unable to find utility "simctl", not a developer tool or in PATH
  error Could not parse the simulator list output. Run CLI with --verbose flag for more details.
  Error: Command failed: xcrun simctl list --json devices
  xcrun: error: unable to find utility "simctl", not a developer tool or in PATH
  
      at checkExecSyncError (child_process.js:629:11)
      at Object.execFileSync (child_process.js:647:13)
      at runOnSimulator (/Usersamine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js:130:54)
      at Object.runIOS [as func] (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js:100:12)
      at Command.handleAction (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli/build/index.js:164:23)
      at Command.listener (/Users/mine/Documents/code/js/emps_fe6/node_modules/commander/index.js:315:8)
      at Command.emit (events.js:198:13)
      at Command.parseArgs (/Users/amine/Documents/code/js/emps_fe6/node_modules/commander/index.js:651:12)
      at Command.parse (/Users/mine/Documents/code/js/emps_fe6/node_modules/commander/index.js:474:21)
      at setupAndRun (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli/build/index.js:237:24)
  </code></pre>
  
  <p>Here is the output of react native info:</p>
  
  <pre><code>$ react-native info
  info Fetching system and libraries information...
  System:
      OS: macOS High Sierra 10.13.6
      CPU: (8) x64 Intel(R) Core(TM) i7-2675QM CPU @ 2.20GHz
      Memory: 194.93 MB / 8.00 GB
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 10.17.0 - /usr/local/bin/node
      Yarn: 1.19.1 - /usr/local/bin/yarn
      npm: 6.11.3 - /usr/local/bin/npm
    IDEs:
      Xcode: /undefined - /usr/bin/xcodebuild
    npmPackages:
      react: 16.11.0 =&gt; 16.11.0 
      react-native: 0.61.2 =&gt; 0.61.2 
    npmGlobalPackages:
      react-native-cli: 2.0.1
  </code></pre>
  
  <p>Here is the package.json:</p>
  
  <pre><code>"dependencies": {
      "@react-native-community/async-storage": "^1.6.2",
      "moment": "^2.24.0",
      "react": "16.11.0",
      "react-native": "0.61.2",
      "react-native-cli": "^2.0.1",
      "react-native-confirmation-code-field": "^4.1.0",
      "react-native-device-info": "^4.0.1",
      "react-native-elements": "^1.2.6",
      "react-native-gesture-handler": "^1.4.1",
      "react-native-gifted-chat": "^0.11.3",
      "react-native-keychain": "^4.0.1",
      "react-native-linear-gradient": "^2.5.6",
      "react-native-localize": "^1.3.1",
      "react-native-modal": "^11.4.0",
      "react-native-modal-datetime-picker": "^7.6.0",
      "react-native-reanimated": "^1.3.0",
      "react-native-segmented-control-tab": "^3.4.1",
      "react-native-vector-icons": "^6.6.0",
      "react-native-video": "^5.0.2",
      "react-navigation": "^4.0.10",
      "react-navigation-stack": "^1.10.2",
      "react-navigation-tabs": "^2.5.6",
      "simctl": "^2.0.0",
      "socket.io-client": "2.1.1",
      "xcode": "^2.0.0"
    },
  </code></pre>
  
  <p>In the error message, there mentioned quite a few modules which are missing. But those modules have been installed as it shows in the package.json. I am not sure about what the error message means. Also I installed the <code>simctl</code> but <code>scrum simctl</code> still can not find it. I am using VS Code as IDE. </p>
  
  <p>UPDATE:</p>
  
  <p>created an empty <code>Podfile.lock</code> under /ios, the error becomes when run-ios:</p>
  
  <pre><code>error Cannot read property 'SPEC CHECKSUMS' of undefined. Run CLI with --verbose flag for more details.
  TypeError: Cannot read property 'SPEC CHECKSUMS' of undefined
      at getDependenciesFromPodfileLock (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli-platform-ios/build/link-pods/getDependenciesFromPodfileLock.js:63:58)
      at warnAboutPodInstall (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli-platform-ios/build/link/warnAboutPodInstall.js:43:67)
      at Object.runIOS [as func] (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli-platform-ios/build/commands/runIOS/index.js:80:36)
      at Command.handleAction (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli/build/index.js:164:23)
      at Command.listener (/Users/mine/Documents/code/js/emps_fe6/node_modules/commander/index.js:315:8)
      at Command.emit (events.js:198:13)
      at Command.parseArgs (/Users/mine/Documents/code/js/emps_fe6/node_modules/commander/index.js:651:12)
      at Command.parse (/Users/mine/Documents/code/js/emps_fe6/node_modules/commander/index.js:474:21)
      at setupAndRun (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli/build/index.js:237:24)
      at Object.run (/Users/mine/Documents/code/js/emps_fe6/node_modules/@react-native-community/cli/build/index.js:184:11)
  </code></pre>