[CupertinoActivityIndicator] Add `color` parameter (#92172)

packages/flutter/lib/src/cupertino/activity_indicator.dart

@@ -27,6 +27,7 @@ class CupertinoActivityIndicator extends StatefulWidget {
   /// Creates an iOS-style activity indicator that spins clockwise.
   const CupertinoActivityIndicator({
     Key? key,
+    this.color,
     this.animating = true,
     this.radius = _kDefaultIndicatorRadius,
   })  : assert(animating != null),
@@ -43,6 +44,7 @@ class CupertinoActivityIndicator extends StatefulWidget {
   /// to 1.0.
   const CupertinoActivityIndicator.partiallyRevealed({
     Key? key,
+    this.color,
     this.radius = _kDefaultIndicatorRadius,
     this.progress = 1.0,
   })  : assert(radius != null),
@@ -53,6 +55,11 @@ class CupertinoActivityIndicator extends StatefulWidget {
         animating = false,
         super(key: key);
 
+  /// Color of the activity indicator.
+  ///
+  /// Defaults to color extracted from native iOS.
+  final Color? color;
+
   /// Whether the activity indicator is running its animation.
   ///
   /// Defaults to true.
@@ -117,8 +124,7 @@ class _CupertinoActivityIndicatorState extends State<CupertinoActivityIndicator>
       child: CustomPaint(
         painter: _CupertinoActivityIndicatorPainter(
           position: _controller,
-          activeColor:
-              CupertinoDynamicColor.resolve(_kActiveTickColor, context),
+          activeColor: widget.color ?? CupertinoDynamicColor.resolve(_kActiveTickColor, context),
           radius: widget.radius,
           progress: widget.progress,
         ),

packages/flutter/lib/src/material/progress_indicator.dart

@@ -594,7 +594,8 @@ class _CircularProgressIndicatorState extends State<CircularProgressIndicator> w
   }
 
   Widget _buildCupertinoIndicator(BuildContext context) {
-    return CupertinoActivityIndicator(key: widget.key);
+    final Color? tickColor = widget.backgroundColor;
+    return CupertinoActivityIndicator(key: widget.key, color: tickColor);
   }
 
   Widget _buildMaterialIndicator(BuildContext context, double headValue, double tailValue, double offsetValue, double rotationValue) {

packages/flutter/test/cupertino/activity_indicator_test.dart

@@ -158,6 +158,32 @@ void main() {
         ..rrect(rrect: const RRect.fromLTRBXY(-10, -100 / 3, 10, -100, 10, 10)),
     );
   });
+
+  testWidgets('Can specify color', (WidgetTester tester) async {
+    final Key key = UniqueKey();
+    await tester.pumpWidget(
+      Center(
+        child: RepaintBoundary(
+          key: key,
+          child: Container(
+            color: CupertinoColors.white,
+            child: const CupertinoActivityIndicator(
+              animating: false,
+              color: Color(0xFF5D3FD3),
+              radius: 100,
+            ),
+          ),
+        ),
+      ),
+    );
+
+    expect(
+      find.byType(CupertinoActivityIndicator),
+      paints
+        ..rrect(rrect: const RRect.fromLTRBXY(-10, -100 / 3, 10, -100, 10, 10),
+                color: const Color(0x935d3fd3)),
+    );
+  });
 }
 
 Widget buildCupertinoActivityIndicator([bool? animating]) {

packages/flutter/test/material/progress_indicator_test.dart

@@ -822,6 +822,34 @@ void main() {
     }),
   );
 
+  testWidgets(
+    'Adaptive CircularProgressIndicator can use backgroundColor to change tick color for iOS',
+    (WidgetTester tester) async {
+      await tester.pumpWidget(
+        const MaterialApp(
+          home: Scaffold(
+            body: Material(
+              child: CircularProgressIndicator.adaptive(
+                backgroundColor: Color(0xFF5D3FD3),
+              ),
+            ),
+          ),
+        ),
+      );
+
+      expect(
+        find.byType(CupertinoActivityIndicator),
+        paints
+          ..rrect(rrect: const RRect.fromLTRBXY(-1, -10 / 3, 1, -10, 1, 1),
+                color: const Color(0x935D3FD3)),
+      );
+    },
+    variant: const TargetPlatformVariant(<TargetPlatform> {
+      TargetPlatform.iOS,
+      TargetPlatform.macOS,
+    }),
+  );
+
   testWidgets(
     'Adaptive CircularProgressIndicator does not display CupertinoActivityIndicator in non-iOS',
     (WidgetTester tester) async {