Fix bundle id on iOS launch using flutter run (#31039)

packages/flutter_tools/lib/src/ios/simulators.dart

@@ -23,6 +23,7 @@ import '../project.dart';
 import '../protocol_discovery.dart';
 import 'ios_workflow.dart';
 import 'mac.dart';
+import 'plist_utils.dart';
 
 const String _xcrunPath = '/usr/bin/xcrun';
 
@@ -343,7 +344,15 @@ class IOSSimulator extends Device {
 
     // Launch the updated application in the simulator.
     try {
-      await SimControl.instance.launch(id, package.id, args);
+      // Use the built application's Info.plist to get the bundle identifier,
+      // which should always yield the correct value and does not require
+      // parsing the xcodeproj or configuration files.
+      // See https://github.com/flutter/flutter/issues/31037 for more information.
+      final IOSApp iosApp = package;
+      final String plistPath = fs.path.join(iosApp.simulatorBundlePath, 'Info.plist');
+      final String bundleIdentifier = iosWorkflow.getPlistValueFromFile(plistPath, kCFBundleIdentifierKey);
+
+      await SimControl.instance.launch(id, bundleIdentifier, args);
     } catch (error) {
       printError('$error');
       return LaunchResult.failed();

packages/flutter_tools/test/ios/simulators_test.dart

@@ -6,10 +6,12 @@ import 'dart:async';
 import 'dart:io' show ProcessResult, Process;
 
 import 'package:file/file.dart';
+import 'package:flutter_tools/src/build_info.dart';
 import 'package:file/memory.dart';
 import 'package:flutter_tools/src/device.dart';
 import 'package:flutter_tools/src/application_package.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/ios/ios_workflow.dart';
 import 'package:flutter_tools/src/ios/mac.dart';
 import 'package:flutter_tools/src/ios/simulators.dart';
 import 'package:flutter_tools/src/project.dart';
@@ -26,6 +28,8 @@ class MockIMobileDevice extends Mock implements IMobileDevice {}
 class MockProcess extends Mock implements Process {}
 class MockProcessManager extends Mock implements ProcessManager {}
 class MockXcode extends Mock implements Xcode {}
+class MockSimControl extends Mock implements SimControl {}
+class MockIOSWorkflow extends Mock implements IOSWorkflow {}
 
 void main() {
   FakePlatform osx;
@@ -417,6 +421,33 @@ void main() {
     });
   });
 
+  group('startApp', () {
+    SimControl simControl;
+
+    setUp(() {
+      simControl = MockSimControl();
+    });
+
+    testUsingContext("startApp uses compiled app's Info.plist to find CFBundleIdentifier", () async {
+        final IOSSimulator device = IOSSimulator('x', name: 'iPhone SE', category: 'iOS 11.2');
+        when(iosWorkflow.getPlistValueFromFile(any, any)).thenReturn('correct');
+
+        final Directory mockDir = fs.currentDirectory;
+        final IOSApp package = PrebuiltIOSApp(projectBundleId: 'incorrect', bundleName: 'name', bundleDir: mockDir);
+
+        const BuildInfo mockInfo = BuildInfo(BuildMode.debug, 'flavor');
+        final DebuggingOptions mockOptions = DebuggingOptions.disabled(mockInfo);
+        await device.startApp(package, prebuiltApplication: true, debuggingOptions: mockOptions);
+
+        verify(simControl.launch(any, 'correct', any));
+      },
+      overrides: <Type, Generator>{
+        SimControl: () => simControl,
+        IOSWorkflow: () => MockIOSWorkflow()
+      },
+    );
+  });
+
   testUsingContext('IOSDevice.isSupportedForProject is true on module project', () async {
     fs.file('pubspec.yaml')
       ..createSync()