diff --git a/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn b/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn
index 37290b9f827..d9f008ff2a4 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn
+++ b/engine/src/flutter/shell/platform/darwin/ios/BUILD.gn
@@ -255,6 +255,7 @@ shared_library("ios_test_flutter") {
     ":ios_gpu_configuration",
     ":ios_test_flutter_mrc",
     "//flutter/common:common",
+    "//flutter/lib/ui:ui",
     "//flutter/shell/platform/darwin/common:framework_shared",
     "//flutter/shell/platform/embedder:embedder_as_internal_library",
     "//flutter/third_party/tonic",
diff --git a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm
index 905fcc0dd67..da09c2d8aca 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm
+++ b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewController.mm
@@ -641,7 +641,9 @@ static void sendFakeTouchEvent(FlutterEngine* engine,
     _engineNeedsLaunch = NO;
   }
 
-  [_engine.get() attachView];
+  if ([_engine.get() viewController] == self) {
+    [_engine.get() attachView];
+  }
 
   if (@available(iOS 13.4, *)) {
     _pointerInteraction.reset([[UIPointerInteraction alloc] initWithDelegate:self]);
@@ -1005,7 +1007,9 @@ static flutter::PointerData::DeviceKind DeviceKindFromTouchType(UITouch* touch)
 #pragma mark - Handle view resizing
 
 - (void)updateViewportMetrics {
-  [_engine.get() updateViewportMetrics:_viewportMetrics];
+  if ([_engine.get() viewController] == self) {
+    [_engine.get() updateViewportMetrics:_viewportMetrics];
+  }
 }
 
 - (CGFloat)statusBarPadding {
diff --git a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewControllerTest.mm b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewControllerTest.mm
index 5cb96fd35d7..4cac7322b0e 100644
--- a/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewControllerTest.mm
+++ b/engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterViewControllerTest.mm
@@ -5,6 +5,7 @@
 #import <OCMock/OCMock.h>
 #import <XCTest/XCTest.h>
 
+#import "flutter/lib/ui/window/viewport_metrics.h"
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
 #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
 #import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h"
@@ -67,6 +68,8 @@ class PointerDataPacket {};
          libraryURI:(NSString*)libraryURI
        initialRoute:(NSString*)initialRoute;
 - (void)dispatchPointerDataPacket:(std::unique_ptr<flutter::PointerDataPacket>)packet;
+- (void)updateViewportMetrics:(flutter::ViewportMetrics)viewportMetrics;
+- (void)attachView;
 @end
 
 @interface FlutterEngine (TestLowMemory)
@@ -115,6 +118,7 @@ typedef enum UIAccessibilityContrast : NSInteger {
 - (void)handlePressEvent:(FlutterUIPressProxy*)press
               nextAction:(void (^)())next API_AVAILABLE(ios(13.4));
 - (void)scrollEvent:(UIPanGestureRecognizer*)recognizer;
+- (void)updateViewportMetrics;
 @end
 
 @interface FlutterViewControllerTest : XCTestCase
@@ -177,6 +181,63 @@ typedef enum UIAccessibilityContrast : NSInteger {
   XCTAssertNil(weakViewController);
 }
 
+- (void)testUpdateViewportMetricsDoesntInvokeEngineWhenNotTheViewController {
+  FlutterEngine* mockEngine = OCMPartialMock([[FlutterEngine alloc] init]);
+  [mockEngine createShell:@"" libraryURI:@"" initialRoute:nil];
+  FlutterViewController* viewControllerA = [[FlutterViewController alloc] initWithEngine:mockEngine
+                                                                                 nibName:nil
+                                                                                  bundle:nil];
+  mockEngine.viewController = nil;
+  FlutterViewController* viewControllerB = [[FlutterViewController alloc] initWithEngine:mockEngine
+                                                                                 nibName:nil
+                                                                                  bundle:nil];
+  mockEngine.viewController = viewControllerB;
+  [viewControllerA updateViewportMetrics];
+  flutter::ViewportMetrics viewportMetrics;
+  OCMVerify(never(), [mockEngine updateViewportMetrics:viewportMetrics]);
+}
+
+- (void)testUpdateViewportMetricsDoesInvokeEngineWhenIsTheViewController {
+  FlutterEngine* mockEngine = OCMPartialMock([[FlutterEngine alloc] init]);
+  [mockEngine createShell:@"" libraryURI:@"" initialRoute:nil];
+  FlutterViewController* viewController = [[FlutterViewController alloc] initWithEngine:mockEngine
+                                                                                nibName:nil
+                                                                                 bundle:nil];
+  mockEngine.viewController = viewController;
+  [viewController updateViewportMetrics];
+  flutter::ViewportMetrics viewportMetrics;
+  OCMVerify([mockEngine updateViewportMetrics:viewportMetrics]);
+}
+
+- (void)testViewDidLoadDoesntInvokeEngineWhenNotTheViewController {
+  FlutterEngine* mockEngine = OCMPartialMock([[FlutterEngine alloc] init]);
+  [mockEngine createShell:@"" libraryURI:@"" initialRoute:nil];
+  FlutterViewController* viewControllerA = [[FlutterViewController alloc] initWithEngine:mockEngine
+                                                                                 nibName:nil
+                                                                                  bundle:nil];
+  mockEngine.viewController = nil;
+  FlutterViewController* viewControllerB = [[FlutterViewController alloc] initWithEngine:mockEngine
+                                                                                 nibName:nil
+                                                                                  bundle:nil];
+  mockEngine.viewController = viewControllerB;
+  UIView* view = viewControllerA.view;
+  XCTAssertNotNil(view);
+  OCMVerify(never(), [mockEngine attachView]);
+}
+
+- (void)testViewDidLoadDoesInvokeEngineWhenIsTheViewController {
+  FlutterEngine* mockEngine = OCMPartialMock([[FlutterEngine alloc] init]);
+  [mockEngine createShell:@"" libraryURI:@"" initialRoute:nil];
+  mockEngine.viewController = nil;
+  FlutterViewController* viewController = [[FlutterViewController alloc] initWithEngine:mockEngine
+                                                                                nibName:nil
+                                                                                 bundle:nil];
+  mockEngine.viewController = viewController;
+  UIView* view = viewController.view;
+  XCTAssertNotNil(view);
+  OCMVerify([mockEngine attachView]);
+}
+
 - (void)testBinaryMessenger {
   FlutterViewController* vc = [[FlutterViewController alloc] initWithEngine:self.mockEngine
                                                                     nibName:nil