Correctly added application callback for dynamic links (#5385)

* Correctly added application callback for dynamic links

* Misspelling

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

@@ -146,6 +146,15 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (BOOL)application:(UIApplication*)application
     performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler;
+
+/**
+ Called if this plugin has been registered for `UIApplicationDelegate` callbacks.
+
+ - Returns: `YES` if this plugin handles the request.
+ */
+- (BOOL)application:(UIApplication*)application
+    continueUserActivity:(NSUserActivity*)userActivity
+      restorationHandler:(void (^)(NSArray*))restorationHandler;
 @end
 
 /**

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

@@ -235,6 +235,21 @@
   }
 }
 
+- (BOOL)application:(UIApplication*)application
+    continueUserActivity:(NSUserActivity*)userActivity
+      restorationHandler:(void (^)(NSArray*))restorationHandler {
+  for (id<FlutterPlugin> plugin in _pluginDelegates) {
+    if ([plugin respondsToSelector:_cmd]) {
+      if ([plugin application:application
+              continueUserActivity:userActivity
+                restorationHandler:restorationHandler]) {
+        return YES;
+      }
+    }
+  }
+  return NO;
+}
+
 // TODO(xster): move when doing https://github.com/flutter/flutter/issues/3671.
 - (NSObject<FlutterBinaryMessenger>*)binaryMessenger {
   UIViewController* rootViewController = _window.rootViewController;