title: Flutter.h not found error
body: <p>I've lost the ability to build Flutter applications for iOS since a few days back. I updated my iPad to 11.4 which forced me to update xCode to 9.4 and I think there was a new release of Flutter thrown in the mix too. In my infinite wisdom I updated them all and now can't test my projects any more. </p>
  
  <p>With deadlines approaching quickly I am looking for advice on how to get moving again. I'm not that familiar with Apple products so don't really know my way around xCode etc yet.</p>
  
  <p>This is a fresh 'FLUTTER CREATE testproject' project, no changes have been made to it whatsoever.</p>
  
  <p>FLUTTER RUN log:</p>
  
  <pre><code>Launching lib/main.dart on iPad Pro (12.9-inch) (2nd generation) in debug mode...
  Starting Xcode build...
  Xcode build done.
  Failed to build iOS app
  Error output from Xcode build:
  ↳
      ** BUILD FAILED **
  
  Xcode's output:
  ↳
      === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
      cp: /Users/trevburley/FlutterSDK/flutter/bin/cache/artifacts/engine/ios/Flutter.framework: No such file or directory
      find: /Users/trevburley/IdeaProjects/testproject/ios/Flutter/Flutter.framework: No such file or directory
      Project /Users/trevburley/IdeaProjects/testproject built and packaged successfully.
      Command /bin/sh emitted errors but did not return a nonzero exit code to indicate failure
      In file included from /Users/trevburley/IdeaProjects/testproject/ios/Runner/GeneratedPluginRegistrant.m:5:
      /Users/trevburley/IdeaProjects/testproject/ios/Runner/GeneratedPluginRegistrant.h:8:9: fatal error: 'Flutter/Flutter.h' file not found
      #import &lt;Flutter/Flutter.h&gt;
              ^~~~~~~~~~~~~~~~~~~
      1 error generated.
  Could not build the application for the simulator.
  Error launching application on iPad Pro (12.9-inch) (2nd generation).
  </code></pre>
  
  <p>and verbose FLUTTER DOCTOR:</p>
  
  <pre><code>Trevs-MBP:testproject trevburley$ flutter doctor -v
  [✓] Flutter (Channel beta, v0.4.4, on Mac OS X 10.13.5 17F77, locale en-GB)
      • Flutter version 0.4.4 at /Users/trevburley/FlutterSDK/flutter
      • Framework revision f9bb4289e9 (3 weeks ago), 2018-05-11 21:44:54 -0700
      • Engine revision 06afdfe54e
      • Dart version 2.0.0-dev.54.0.flutter-46ab040e58
  
  [✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
      • Android SDK at /Users/trevburley/Library/Android/sdk
      • Android NDK location not configured (optional; useful for native profiling support)
      • Platform android-27, build-tools 27.0.3
      • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
      • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
      • All Android licenses accepted.
  
  [✓] iOS toolchain - develop for iOS devices (Xcode 9.4)
      • Xcode at /Applications/Xcode.app/Contents/Developer
      • Xcode 9.4, Build version 9F1027a
      • ios-deploy 1.9.2
      • CocoaPods version 1.5.3
  
  [✓] Android Studio (version 3.1)
      • Android Studio at /Applications/Android Studio.app/Contents
      • Flutter plugin version 25.0.1
      • Dart plugin version 173.4700
      • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
  
  [✓] IntelliJ IDEA Community Edition (version 2018.1.4)
      • IntelliJ at /Applications/IntelliJ IDEA CE.app
      • Flutter plugin version 25.0.2
      • Dart plugin version 181.4892.1
  
  [✓] VS Code (version 1.23.1)
      • VS Code at /Applications/Visual Studio Code.app/Contents
      • Dart Code extension version 2.13.0
  
  [✓] Connected devices (1 available)
      • iPad Pro (12.9-inch) (2nd generation) • D8D24435-C465-4403-B74F-E8DD32DDD30A • ios • iOS 11.4 (simulator)
  
  • No issues found!
  </code></pre>