From c354127d4dfd2b960a6fa7ca173d65cb005801fa Mon Sep 17 00:00:00 2001
From: Chris Bracken <chris@bracken.jp>
Date: Thu, 2 Feb 2017 16:29:22 -0800
Subject: [PATCH] Support status bar taps in FlutterAppDelegate (#3387)

Provide a default status bar tap handler for FlutterAppDelegate.
By default, taps are passed to the key window's rootViewController if
it's a FlutterViewController. Apps with custom app delegates can
customize this behaviour to send the tap to the FlutterViewController(s)
they prefer by overriding touchesBegan:withEvent.
---
 .../framework/Headers/FlutterAppDelegate.h    | 14 ++++++++++---
 .../framework/Source/FlutterAppDelegate.mm    | 21 +++++++++++++++++++
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h b/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h
index ef7a4e2315a..967c55745b7 100644
--- a/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h
+++ b/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h
@@ -9,10 +9,18 @@
 
 #include "FlutterMacros.h"
 
-// Empty implementation of UIApplicationDelegate, for simple apps
-// that don't need to customize the application delegate.
+/**
+ * UIApplicationDelegate subclass for simple apps that want default behavior.
+ *
+ * This class provides the following behaviors:
+ *   * Status bar touches are forwarded to the key window's root view
+ *     FlutterViewController, in order to trigger scroll to top.
+ *
+ * App delegates for Flutter applications are *not* required to inherit from
+ * this class. Developers of custom app delegate classes should copy and paste
+ * code as necessary from FlutterAppDelegate.mm.
+ */
 FLUTTER_EXPORT
-__attribute__((deprecated("subclass UIResponder<UIApplicationDelegate>")))
 @interface FlutterAppDelegate : UIResponder<UIApplicationDelegate>
 
 @property(strong, nonatomic) UIWindow* window;
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm b/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm
index b69ee926376..6af8ce94216 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterAppDelegate.mm
@@ -3,7 +3,28 @@
 // found in the LICENSE file.
 
 #include "flutter/shell/platform/darwin/ios/framework/Headers/FlutterAppDelegate.h"
+#include "flutter/shell/platform/darwin/ios/framework/Headers/FlutterViewController.h"
 
 @implementation FlutterAppDelegate
 
+// Returns the key window's rootViewController, if it's a FlutterViewController.
+// Otherwise, returns nil.
+- (FlutterViewController*)rootFlutterViewController {
+  UIViewController *viewController =
+      [UIApplication sharedApplication].keyWindow.rootViewController;
+  if ([viewController isKindOfClass:[FlutterViewController class]]) {
+    return (FlutterViewController*)viewController;
+  }
+  return nil;
+}
+
+- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
+  [super touchesBegan:touches withEvent:event];
+
+  // Pass status bar taps to key window Flutter rootViewController.
+  if (self.rootFlutterViewController != nil) {
+    [self.rootFlutterViewController handleStatusBarTouches:event];
+  }
+}
+
 @end