From f2bf93c449ffd4994236cabd948a8175fb4f8d01 Mon Sep 17 00:00:00 2001
From: zhongwuzw <zhongwuzw@qq.com>
Date: Wed, 3 Nov 2021 23:05:29 +0800
Subject: [PATCH] [macOS] Fixes Crash of cxx destruction when App will
 terminate

---
 .../macos/framework/Source/FlutterViewController.mm   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/shell/platform/darwin/macos/framework/Source/FlutterViewController.mm b/shell/platform/darwin/macos/framework/Source/FlutterViewController.mm
index 87b41b9e44a78..ffbfa255beabe 100644
--- a/shell/platform/darwin/macos/framework/Source/FlutterViewController.mm
+++ b/shell/platform/darwin/macos/framework/Source/FlutterViewController.mm
@@ -254,6 +254,10 @@ static void CommonInit(FlutterViewController* controller) {
              selector:@selector(onAccessibilityStatusChanged:)
                  name:EnhancedUserInterfaceNotification
                object:nil];
+  [center addObserver:controller
+             selector:@selector(applicationWillTerminate:)
+                 name:NSApplicationWillTerminateNotification
+               object:nil];
 }
 
 - (instancetype)initWithCoder:(NSCoder*)coder {
@@ -557,6 +561,13 @@ - (void)dispatchMouseEvent:(NSEvent*)event phase:(FlutterPointerPhase)phase {
   }
 }
 
+- (void)applicationWillTerminate:(NSNotification*)notification {
+  if (!_engine) {
+    return;
+  }
+  [_engine shutDownEngine];
+}
+
 - (void)onAccessibilityStatusChanged:(NSNotification*)notification {
   if (!_engine) {
     return;