Build Flutter app as a framework on iOS (#8971)
**THIS IS A BREAKING CHANGE.** See below for migration steps for existing projects. Previously, Flutter app code was built as a raw dylib on iOS. Dynamic libraries outside of a framework bundle are not supported on iOS, except for the system Swift libraries provided by Xcode. See: https://developer.apple.com/library/content/technotes/tn2435/_index.html#//apple_ref/doc/uid/DTS40017543-CH1-TROUBLESHOOTING_BUNDLE_ERRORS-EMBEDDED__DYLIB_FILES * Migrates Xcode build from app.dylib to App.framework * Migrates flutter create template * Migrates example projects Migration steps for existing projects ===================================== The following steps should be taken from the root of your Flutter project: 1. Edit `ios/.gitignore`: add `/Flutter/App.framework` on a new line. 2. In the Xcode project navigator, remove `app.dylib` from the Flutter folder. Delete this file from the `ios/Flutter` directory in your project. 3. Run a build to generate `ios/Flutter/App.framework`. From the command line, run `flutter build ios`. If you have not configured app signing in Xcode, an alternative method is to open the simulator, then run `flutter run -d iP`. 4. In the Xcode project navigator, select the `Runner` project. In the project settings that are displayed in the main view, ensure that the `Runner` target is selected. You can verify this by exposing the sidebar using the [| ] icon in the upper-left corner of the main view. 5. Select the *General* tab in the project settings. Under the *Embedded Binaries* section, click '+' to add `App.framework`. In the sheet that drops down, click the *Add Other...* button. Navigate to the `ios/Flutter` directory and select `App.framework`. Click *Open*. In the sheet that drops down, select *Create folder references*, then click *Finish*. 6. In the project settings, verify that `App.framework` has been added to the *Embedded Binaries* and *Linked Frameworks and Libraries* lists. 7. In the Xcode project navigator, drag `App.framework` under the Flutter folder. 8. In the Xcode project navigator, select `Flutter` then from the *File* menu, select *Add Files to "Runner"...*. Navigate to the `ios/Flutter` directory, select `AppFrameworkInfo.plist` and click the *Add* button. 9. From the command line, in your project directory, run `flutter build clean`, then `flutter run`. At this point your project should be fully migrated.
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