If app not in foreground, don't send resume message

Author: Ye Chunlin

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

@@ -626,12 +626,10 @@ - (void)viewDidAppear:(BOOL)animated {
   TRACE_EVENT0("flutter", "viewDidAppear");
   [self onUserSettingsChanged:nil];
   [self onAccessibilityStatusChanged:nil];
-  [[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.resumed"];
-
-  [super viewDidAppear:animated];
-  if (UIApplication.sharedApplication.applicationState == UIApplicationStateBackground) {
-    [[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.paused"];
+  if (UIApplication.sharedApplication.applicationState == UIApplicationStateActive) {
+    [[_engine.get() lifecycleChannel] sendMessage:@"AppLifecycleState.resumed"];
   }
+  [super viewDidAppear:animated];
 }
 
 - (void)viewWillDisappear:(BOOL)animated {