Fix for dimensions not updating correctly on iPad due to screen rotation

Summary:
On certain devices (in my case, any iPad Pro model), listening to `DeviceEventEmitter.didUpdateDimensions` would call back *before* the interface change takes places (i.e. calling `Dimensions.get()` in this callback would return wrong values). Turns out that we were listening for the wrong native event.

Edit to add: now using `[RCTSharedApplication() statusBarOrientation]` to get the current orientation. Not yet sure why, but the `userInfo` provided by the notification was returning the wrong orientation *only* on the first time you rotate the device.

This fixes the open issue: https://github.com/facebook/react-native/issues/7340
Closes https://github.com/facebook/react-native/pull/11350

Differential Revision: D4348186

Pulled By: javache

fbshipit-source-id: cb2cfb9cccfc459ad4b46a5af2bec4c973132ae8

React/Modules/RCTUIManager.m

@@ -246,11 +246,11 @@ RCT_EXPORT_MODULE()
   });
 }
 
-- (void)interfaceOrientationWillChange:(NSNotification *)notification
+- (void)interfaceOrientationDidChange
 {
 #if !TARGET_OS_TV
   UIInterfaceOrientation nextOrientation =
-    [notification.userInfo[UIApplicationStatusBarOrientationUserInfoKey] integerValue];
+    [RCTSharedApplication() statusBarOrientation];
 
   // Update when we go from portrait to landscape, or landscape to portrait
   if ((UIInterfaceOrientationIsPortrait(_currentInterfaceOrientation) &&
@@ -260,7 +260,7 @@ RCT_EXPORT_MODULE()
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
     [_bridge.eventDispatcher sendDeviceEventWithName:@"didUpdateDimensions"
-                                                body:RCTExportedDimensions(YES)];
+                                                body:RCTExportedDimensions()];
 #pragma clang diagnostic pop
   }
 
@@ -347,8 +347,8 @@ RCT_EXPORT_MODULE()
                                              object:_bridge.accessibilityManager];
 #if !TARGET_OS_TV
   [[NSNotificationCenter defaultCenter] addObserver:self
-                                           selector:@selector(interfaceOrientationWillChange:)
-                                               name:UIApplicationWillChangeStatusBarOrientationNotification
+                                           selector:@selector(interfaceOrientationDidChange)
+                                               name:UIApplicationDidChangeStatusBarOrientationNotification
                                              object:nil];
 #endif
 
@@ -1525,12 +1525,12 @@ RCT_EXPORT_METHOD(clearJSResponder)
 
   constants[@"customBubblingEventTypes"] = bubblingEvents;
   constants[@"customDirectEventTypes"] = directEvents;
-  constants[@"Dimensions"] = RCTExportedDimensions(NO);
+  constants[@"Dimensions"] = RCTExportedDimensions();
 
   return constants;
 }
 
-static NSDictionary *RCTExportedDimensions(BOOL rotateBounds)
+static NSDictionary *RCTExportedDimensions()
 {
   RCTAssertMainQueue();
 
@@ -1538,8 +1538,8 @@ static NSDictionary *RCTExportedDimensions(BOOL rotateBounds)
   CGRect screenSize = [[UIScreen mainScreen] bounds];
   return @{
     @"window": @{
-        @"width": @(rotateBounds ? screenSize.size.height : screenSize.size.width),
-        @"height": @(rotateBounds ? screenSize.size.width : screenSize.size.height),
+        @"width": @(screenSize.size.width),
+        @"height": @(screenSize.size.height),
         @"scale": @(RCTScreenScale()),
     },
   };