(iOS) Add RCTUIStatusBarManager and properly retrieve StatusBar style and height (#42241)

Summary:
This PR migrates from the deprecated way of retrieving the status bar info. It introduces a helper method `RCTUIStatusBarManager` which gets the `UIStatusBarManager` from the KeyWindow.

It also removes the unused `getHeight` method.

## Changelog:

[IOS] [ADDED] - Add `RCTUIStatusBarManager` and properly retrieve StatusBar style and height
[IOS] [REMOVED] - Remove unused getHeight method from StatusBar

Pull Request resolved: https://github.com/facebook/react-native/pull/42241

Test Plan: CI Green, Ensure that preferredStatusBarStyle and preferredStatusBarHidden is properly retrieved for Modals

Reviewed By: philIip

Differential Revision: D52729974

Pulled By: cipolleschi

fbshipit-source-id: 40adef810c1d419900fb7ba706af6fb095941e10

packages/react-native/React/Base/RCTUtils.h

@@ -99,6 +99,9 @@ RCT_EXTERN UIWindow *__nullable RCTKeyWindow(void);
 // e.g. to present a modal view controller or alert over it
 RCT_EXTERN UIViewController *__nullable RCTPresentedViewController(void);
 
+// Retrieve current window UIStatusBarManager
+RCT_EXTERN UIStatusBarManager *__nullable RCTUIStatusBarManager(void) API_AVAILABLE(ios(13));
+
 // Does this device support force touch (aka 3D Touch)?
 RCT_EXTERN BOOL RCTForceTouchAvailable(void);
 

packages/react-native/React/Base/RCTUtils.m

@@ -579,6 +579,11 @@ UIWindow *__nullable RCTKeyWindow(void)
   return nil;
 }
 
+UIStatusBarManager *__nullable RCTUIStatusBarManager(void)
+{
+  return RCTKeyWindow().windowScene.statusBarManager;
+}
+
 UIViewController *__nullable RCTPresentedViewController(void)
 {
   if ([RCTUtilsUIOverride hasPresentedViewController]) {

packages/react-native/React/CoreModules/RCTStatusBarManager.mm

@@ -14,6 +14,9 @@
 
 #import <FBReactNativeSpec/FBReactNativeSpec.h>
 
+static NSString *const kStatusBarFrameDidChange = @"statusBarFrameDidChange";
+static NSString *const kStatusBarFrameWillChange = @"statusBarFrameWillChange";
+
 @implementation RCTConvert (UIStatusBar)
 
 + (UIStatusBarStyle)UIStatusBarStyle:(id)json RCT_DYNAMIC
@@ -71,7 +74,7 @@ RCT_EXPORT_MODULE()
 
 - (NSArray<NSString *> *)supportedEvents
 {
-  return @[ @"statusBarFrameDidChange", @"statusBarFrameWillChange" ];
+  return @[ kStatusBarFrameDidChange, kStatusBarFrameWillChange ];
 }
 
 - (void)startObserving
@@ -108,12 +111,12 @@ RCT_EXPORT_MODULE()
 
 - (void)applicationDidChangeStatusBarFrame:(NSNotification *)notification
 {
-  [self emitEvent:@"statusBarFrameDidChange" forNotification:notification];
+  [self emitEvent:kStatusBarFrameDidChange forNotification:notification];
 }
 
 - (void)applicationWillChangeStatusBarFrame:(NSNotification *)notification
 {
-  [self emitEvent:@"statusBarFrameWillChange" forNotification:notification];
+  [self emitEvent:kStatusBarFrameWillChange forNotification:notification];
 }
 
 RCT_EXPORT_METHOD(getHeight : (RCTResponseSenderBlock)callback)
@@ -167,7 +170,7 @@ RCT_EXPORT_METHOD(setNetworkActivityIndicatorVisible : (BOOL)visible)
   __block facebook::react::ModuleConstants<JS::NativeStatusBarManagerIOS::Constants> constants;
   RCTUnsafeExecuteOnMainQueueSync(^{
     constants = facebook::react::typedConstants<JS::NativeStatusBarManagerIOS::Constants>({
-        .HEIGHT = RCTSharedApplication().statusBarFrame.size.height,
+        .HEIGHT = RCTUIStatusBarManager().statusBarFrame.size.height,
         .DEFAULT_BACKGROUND_COLOR = std::nullopt,
     });
   });

packages/react-native/React/Fabric/Mounting/ComponentViews/Modal/RCTFabricModalHostViewController.mm

@@ -44,7 +44,7 @@
 
 - (UIStatusBarStyle)preferredStatusBarStyle
 {
-  return [RCTSharedApplication() statusBarStyle];
+  return [RCTUIStatusBarManager() statusBarStyle];
 }
 
 - (void)viewDidDisappear:(BOOL)animated
@@ -55,7 +55,7 @@
 
 - (BOOL)prefersStatusBarHidden
 {
-  return [RCTSharedApplication() isStatusBarHidden];
+  return [RCTUIStatusBarManager() isStatusBarHidden];
 }
 
 #if RCT_DEV

packages/react-native/React/Views/RCTModalHostViewController.m

@@ -24,8 +24,8 @@
 
   self.modalInPresentation = YES;
 
-  _preferredStatusBarStyle = [RCTSharedApplication() statusBarStyle];
-  _preferredStatusBarHidden = [RCTSharedApplication() isStatusBarHidden];
+  _preferredStatusBarStyle = [RCTUIStatusBarManager() statusBarStyle];
+  _preferredStatusBarHidden = [RCTUIStatusBarManager() isStatusBarHidden];
 
   return self;
 }