Fix ios compile

shell/platform/darwin/ios/framework/Source/FlutterViewController.mm

@@ -59,6 +59,11 @@
 // change. Unfortunately unless you have Werror turned on, incompatible pointers as arguments are
 // just a warning.
 @interface FlutterViewController () <FlutterBinaryMessenger, UIScrollViewDelegate>
+// TODO(dkwingsmt): Make the view ID property public once the iOS shell
+// supports multiple views.
+// https://github.com/flutter/flutter/issues/138168
+@property(nonatomic, assign) int64_t viewId;
+
 @property(nonatomic, readwrite, getter=isDisplayingFlutterUI) BOOL displayingFlutterUI;
 @property(nonatomic, assign) BOOL isHomeIndicatorHidden;
 @property(nonatomic, assign) BOOL isPresentingViewControllerAnimating;
@@ -214,6 +219,12 @@ - (instancetype)initWithCoder:(NSCoder*)aDecoder {
   return self;
 }
 
+- (int64_t)viewId {
+  // TODO(dkwingsmt): Fill the view ID property with the correct value once the
+  // iOS shell supports multiple views.
+  return flutter::kFlutterImplicitViewId;
+}
+
 - (void)awakeFromNib {
   [super awakeFromNib];
   if (!_engine) {
@@ -929,7 +940,7 @@ - (void)flushOngoingTouches {
       pointer_data.change = flutter::PointerData::Change::kCancel;
       pointer_data.device = device.longLongValue;
       pointer_data.pointer_identifier = 0;
-      pointer_data.view_id = _viewIdForPointerEvent();
+      pointer_data.view_id = self.viewId;
 
       // Anything we put here will be arbitrary since there are no touches.
       pointer_data.physical_x = 0;
@@ -1178,7 +1189,7 @@ - (void)dispatchTouches:(NSSet*)touches
 
     pointer_data.device = reinterpret_cast<int64_t>(touch);
 
-    pointer_data.view_id = _viewIdForPointerEvent();
+    pointer_data.view_id = self.viewId;
 
     // Pointer will be generated in pointer_data_packet_converter.cc.
     pointer_data.pointer_identifier = 0;
@@ -2397,7 +2408,7 @@ - (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer
     pointer_data.device = reinterpret_cast<int64_t>(_continuousScrollingPanGestureRecognizer);
     pointer_data.kind = flutter::PointerData::DeviceKind::kTrackpad;
     pointer_data.signal_kind = flutter::PointerData::SignalKind::kScrollInertiaCancel;
-    pointer_data.view_id = _viewIdForPointerEvent();
+    pointer_data.view_id = self.viewId;
 
     if (event.timestamp < _scrollInertiaEventAppKitDeadline) {
       // Only send the event if it occured before the expected natural end of gesture momentum.
@@ -2421,7 +2432,7 @@ - (void)hoverEvent:(UIPanGestureRecognizer*)recognizer API_AVAILABLE(ios(13.4))
   flutter::PointerData pointer_data = [self generatePointerDataAtLastMouseLocation];
   pointer_data.device = reinterpret_cast<int64_t>(recognizer);
   pointer_data.kind = flutter::PointerData::DeviceKind::kMouse;
-  pointer_data.view_id = _viewIdForPointerEvent();
+  pointer_data.view_id = self.viewId;
 
   switch (_hoverGestureRecognizer.state) {
     case UIGestureRecognizerStateBegan:
@@ -2460,7 +2471,7 @@ - (void)hoverEvent:(UIPanGestureRecognizer*)recognizer API_AVAILABLE(ios(13.4))
     inertia_cancel.device = reinterpret_cast<int64_t>(_continuousScrollingPanGestureRecognizer);
     inertia_cancel.kind = flutter::PointerData::DeviceKind::kTrackpad;
     inertia_cancel.signal_kind = flutter::PointerData::SignalKind::kScrollInertiaCancel;
-    inertia_cancel.view_id = _viewIdForPointerEvent();
+    inertia_cancel.view_id = self.viewId;
     packet->SetPointerData(/*i=*/1, inertia_cancel);
     [_engine.get() dispatchPointerDataPacket:std::move(packet)];
     _scrollInertiaEventStartline = DBL_MAX;
@@ -2484,7 +2495,7 @@ - (void)discreteScrollEvent:(UIPanGestureRecognizer*)recognizer API_AVAILABLE(io
   pointer_data.signal_kind = flutter::PointerData::SignalKind::kScroll;
   pointer_data.scroll_delta_x = (translation.x - _mouseState.last_translation.x);
   pointer_data.scroll_delta_y = -(translation.y - _mouseState.last_translation.y);
-  pointer_data.view_id = _viewIdForPointerEvent();
+  pointer_data.view_id = self.viewId;
 
   // The translation reported by UIPanGestureRecognizer is the total translation
   // generated by the pan gesture since the gesture began. We need to be able
@@ -2508,7 +2519,7 @@ - (void)continuousScrollEvent:(UIPanGestureRecognizer*)recognizer API_AVAILABLE(
   flutter::PointerData pointer_data = [self generatePointerDataAtLastMouseLocation];
   pointer_data.device = reinterpret_cast<int64_t>(recognizer);
   pointer_data.kind = flutter::PointerData::DeviceKind::kTrackpad;
-  pointer_data.view_id = _viewIdForPointerEvent();
+  pointer_data.view_id = self.viewId;
   switch (recognizer.state) {
     case UIGestureRecognizerStateBegan:
       pointer_data.change = flutter::PointerData::Change::kPanZoomStart;
@@ -2557,7 +2568,7 @@ - (void)pinchEvent:(UIPinchGestureRecognizer*)recognizer API_AVAILABLE(ios(13.4)
   flutter::PointerData pointer_data = [self generatePointerDataAtLastMouseLocation];
   pointer_data.device = reinterpret_cast<int64_t>(recognizer);
   pointer_data.kind = flutter::PointerData::DeviceKind::kTrackpad;
-  pointer_data.view_id = _viewIdForPointerEvent();
+  pointer_data.view_id = self.viewId;
   switch (recognizer.state) {
     case UIGestureRecognizerStateBegan:
       pointer_data.change = flutter::PointerData::Change::kPanZoomStart;