Add warning for ios profiling issue and link to workaround.

packages/devtools_app/lib/src/app.dart

@@ -518,7 +518,6 @@ class DevToolsAboutDialog extends StatelessWidget {
 
   Widget _createFeedbackLink(BuildContext context) {
     final reportIssuesLink = devToolsExtensionPoints.issueTrackerLink();
-    final colorScheme = Theme.of(context).colorScheme;
     return InkWell(
       onTap: () async {
         ga.select(
@@ -527,7 +526,10 @@ class DevToolsAboutDialog extends StatelessWidget {
         );
         await launchUrl(reportIssuesLink.url, context);
       },
-      child: Text(reportIssuesLink.display, style: linkTextStyle(colorScheme)),
+      child: Text(
+        reportIssuesLink.display,
+        style: Theme.of(context).linkTextStyle,
+      ),
     );
   }
 }

packages/devtools_app/lib/src/profiler/profiler_screen.dart

@@ -4,6 +4,7 @@
 
 import 'dart:async';
 
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:vm_service/vm_service.dart' hide Stack;
@@ -16,6 +17,7 @@ import '../auto_dispose_mixin.dart';
 import '../banner_messages.dart';
 import '../common_widgets.dart';
 import '../config_specific/import_export/import_export.dart';
+import '../config_specific/launch_url/launch_url.dart';
 import '../globals.dart';
 import '../notifications.dart';
 import '../screen.dart';
@@ -30,6 +32,9 @@ import 'profiler_screen_controller.dart';
 final profilerScreenSearchFieldKey =
     GlobalKey(debugLabel: 'ProfilerScreenSearchFieldKey');
 
+const iosProfilerWorkaround =
+    'https://github.com/flutter/flutter/issues/88466#issuecomment-905830680';
+
 class ProfilerScreen extends Screen {
   const ProfilerScreen()
       : super.conditional(
@@ -153,6 +158,36 @@ class _ProfilerScreenBodyState extends State<ProfilerScreenBody>
                   cpuProfileData == null) {
                 return _buildRecordingInfo();
               }
+              if (cpuProfileData.isEmpty) {
+                // TODO(kenz): remove the note about profiling on iOS after
+                // https://github.com/flutter/flutter/issues/88466 is fixed.
+                return Center(
+                  child: RichText(
+                    textAlign: TextAlign.center,
+                    text: TextSpan(
+                      text: 'No CPU samples recorded.',
+                      children: serviceManager.vm.operatingSystem == 'ios'
+                          ? [
+                              const TextSpan(
+                                text: '''
+\n\nIf you are attempting to profile on a real iOS device, you may be hitting a known issue. Try using this ''',
+                              ),
+                              TextSpan(
+                                text: 'workaround',
+                                style: Theme.of(context).linkTextStyle,
+                                recognizer: TapGestureRecognizer()
+                                  ..onTap = () async {
+                                    await launchUrl(
+                                        iosProfilerWorkaround, context);
+                                  },
+                              ),
+                              const TextSpan(text: '.'),
+                            ]
+                          : [],
+                    ),
+                  ),
+                );
+              }
               return CpuProfiler(
                 data: cpuProfileData,
                 controller: controller.cpuProfilerController,

packages/devtools_app/lib/src/status_line.dart

@@ -110,8 +110,6 @@ class StatusLine extends StatelessWidget {
     Screen currentScreen,
     TextTheme textTheme,
   ) {
-    final colorScheme = Theme.of(context).colorScheme;
-
     final String docPageId = currentScreen.docPageId;
     if (docPageId != null) {
       return InkWell(
@@ -125,7 +123,7 @@ class StatusLine extends StatelessWidget {
         },
         child: Text(
           'flutter.dev/devtools/$docPageId',
-          style: linkTextStyle(colorScheme),
+          style: Theme.of(context).linkTextStyle,
         ),
       );
     } else {

packages/devtools_app/lib/src/theme.dart

@@ -409,12 +409,12 @@ extension ThemeDataExtension on ThemeData {
   Color get titleSolidBackgroundColor => colorScheme.isLight
       ? colorScheme.alternatingBackgroundColor
       : canvasColor.darken(0.2);
-}
 
-TextStyle linkTextStyle(ColorScheme colorScheme) => TextStyle(
-      color: colorScheme.devtoolsLink,
-      decoration: TextDecoration.underline,
-    );
+  TextStyle get linkTextStyle => TextStyle(
+        color: colorScheme.devtoolsLink,
+        decoration: TextDecoration.underline,
+      );
+}
 
 const wideSearchTextWidth = 400.0;
 const defaultSearchTextWidth = 200.0;

packages/devtools_app/lib/src/ui/service_extension_widgets.dart

@@ -573,7 +573,7 @@ class ServiceExtensionRichTooltip extends StatelessWidget {
                       children: [
                         Text(
                           'More info',
-                          style: linkTextStyle(Theme.of(context).colorScheme),
+                          style: Theme.of(context).linkTextStyle,
                         ),
                         const SizedBox(width: densePadding),
                         Icon(