Add capability to add AppDelegate as UNUserNotificationCenterDelegate (#9864)

shell/platform/darwin/ios/framework/Headers/FlutterPlugin.h

@@ -23,6 +23,9 @@ NS_ASSUME_NONNULL_BEGIN
  * Protocol for listener of events from the UIApplication, typically a FlutterPlugin.
  */
 @protocol FlutterApplicationLifeCycleDelegate
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
+    <UNUserNotificationCenterDelegate>
+#endif
 @optional
 /**
  * Called if this has been registered for `UIApplicationDelegate` callbacks.
@@ -98,15 +101,6 @@ NS_ASSUME_NONNULL_BEGIN
         "See -[UIApplicationDelegate application:didReceiveLocalNotification:] deprecation",
         ios(4.0, 10.0));
 
-/**
- * Calls all plugins registered for `UNUserNotificationCenterDelegate` callbacks.
- */
-- (void)userNotificationCenter:(UNUserNotificationCenter*)center
-       willPresentNotification:(UNNotification*)notification
-         withCompletionHandler:
-             (void (^)(UNNotificationPresentationOptions options))completionHandler
-    API_AVAILABLE(ios(10));
-
 /**
  * Called if this has been registered for `UIApplicationDelegate` callbacks.
  *
@@ -372,8 +366,14 @@ typedef void (*FlutterPluginRegistrantCallback)(NSObject<FlutterPluginRegistry>*
 /***************************************************************************************************
  * Implement this in the `UIAppDelegate` of your app to enable Flutter plugins to register
  * themselves to the application life cycle events.
+ *
+ * For plugins to receive events from `UNUserNotificationCenter`, register this as the
+ * `UNUserNotificationCenterDelegate`.
  */
 @protocol FlutterAppLifeCycleProvider
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
+    <UNUserNotificationCenterDelegate>
+#endif
 - (void)addApplicationLifeCycleDelegate:(NSObject<FlutterApplicationLifeCycleDelegate>*)delegate;
 @end
 

shell/platform/darwin/ios/framework/Headers/FlutterPluginAppLifeCycleDelegate.h

@@ -14,6 +14,9 @@ NS_ASSUME_NONNULL_BEGIN
  */
 FLUTTER_EXPORT
 @interface FlutterPluginAppLifeCycleDelegate : NSObject
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
+                                               <UNUserNotificationCenterDelegate>
+#endif
 
 /**
  * Registers `delegate` to receive life cycle callbacks via this FlutterPluginAppLifecycleDelegate
@@ -70,15 +73,6 @@ FLUTTER_EXPORT
         "See -[UIApplicationDelegate application:didReceiveLocalNotification:] deprecation",
         ios(4.0, 10.0));
 
-/**
- * Calls all plugins registered for `UNUserNotificationCenterDelegate` callbacks.
- */
-- (void)userNotificationCenter:(UNUserNotificationCenter*)center
-       willPresentNotification:(UNNotification*)notification
-         withCompletionHandler:
-             (void (^)(UNNotificationPresentationOptions options))completionHandler
-    API_AVAILABLE(ios(10));
-
 /**
  * Calls all plugins registered for `UIApplicationDelegate` callbacks in order of registration until
  * some plugin handles the request.

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

@@ -83,15 +83,27 @@ static NSString* kBackgroundFetchCapatibility = @"fetch";
 - (void)userNotificationCenter:(UNUserNotificationCenter*)center
        willPresentNotification:(UNNotification*)notification
          withCompletionHandler:
-             (void (^)(UNNotificationPresentationOptions options))completionHandler
-    API_AVAILABLE(ios(10)) {
-  if (@available(iOS 10.0, *)) {
+             (void (^)(UNNotificationPresentationOptions options))completionHandler {
+  if ([_lifeCycleDelegate respondsToSelector:_cmd]) {
     [_lifeCycleDelegate userNotificationCenter:center
                        willPresentNotification:notification
                          withCompletionHandler:completionHandler];
   }
 }
 
+/**
+ * Calls all plugins registered for `UNUserNotificationCenterDelegate` callbacks.
+ */
+- (void)userNotificationCenter:(UNUserNotificationCenter*)center
+    didReceiveNotificationResponse:(UNNotificationResponse*)response
+             withCompletionHandler:(void (^)(void))completionHandler {
+  if ([_lifeCycleDelegate respondsToSelector:_cmd]) {
+    [_lifeCycleDelegate userNotificationCenter:center
+                didReceiveNotificationResponse:response
+                         withCompletionHandler:completionHandler];
+  }
+}
+
 - (BOOL)application:(UIApplication*)application
             openURL:(NSURL*)url
             options:(NSDictionary<UIApplicationOpenURLOptionsKey, id>*)options {

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

@@ -276,16 +276,23 @@ static BOOL isPowerOfTwo(NSUInteger x) {
        willPresentNotification:(UNNotification*)notification
          withCompletionHandler:
              (void (^)(UNNotificationPresentationOptions options))completionHandler {
-  if (@available(iOS 10.0, *)) {
-    for (NSObject<FlutterApplicationLifeCycleDelegate>* delegate in _delegates) {
-      if (!delegate) {
-        continue;
-      }
-      if ([delegate respondsToSelector:_cmd]) {
-        [delegate userNotificationCenter:center
-                 willPresentNotification:notification
+  for (NSObject<FlutterApplicationLifeCycleDelegate>* delegate in _delegates) {
+    if ([delegate respondsToSelector:_cmd]) {
+      [delegate userNotificationCenter:center
+               willPresentNotification:notification
+                 withCompletionHandler:completionHandler];
+    }
+  }
+}
+
+- (void)userNotificationCenter:(UNUserNotificationCenter*)center
+    didReceiveNotificationResponse:(UNNotificationResponse*)response
+             withCompletionHandler:(void (^)(void))completionHandler {
+  for (id<FlutterApplicationLifeCycleDelegate> delegate in _delegates) {
+    if ([delegate respondsToSelector:_cmd]) {
+      [delegate userNotificationCenter:center
+          didReceiveNotificationResponse:response
                    withCompletionHandler:completionHandler];
-      }
     }
   }
 }