Remove unneeded NSNotification center removeObserver

Summary:
A very common pattern I've seen in RN codebase:

     - (instancetype) init {
        [[NSNotificationCenter defaultCenter] addObserver:self ...]
      }

    - (void) dealloc {
       [[NSNotificationCenter defaultCenter] removeObserver:self ...]
     }

From Apple:

https://developer.apple.com/documentation/foundation/nsnotificationcenter/1413994-removeobserver?language=objc

> If your app targets iOS 9.0 and later or macOS 10.11 and later, you don't need to unregister an observer in its dealloc method.

RN targets iOS9+

Changelog: [Internal][Cleanup] Remove unneeded NSNotification center removeObserver

Reviewed By: shergin

Differential Revision: D18264235

fbshipit-source-id: 684e5f5555cec96b055b13cd83daaeb393f4fac9

Author: Peter Argany

Libraries/CameraRoll/RCTImagePickerManager.mm

@@ -59,11 +59,6 @@ + (BOOL)requiresMainQueueSetup
   return NO;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self name:@"AVCaptureDeviceDidStartRunningNotification" object:nil];
-}
-
 - (dispatch_queue_t)methodQueue
 {
   return dispatch_get_main_queue();

Libraries/Image/RCTAnimatedImage.m

@@ -164,7 +164,6 @@ - (void)dealloc
     CFRelease(_imageSource);
     _imageSource = NULL;
   }
-  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
 }
 
 @end

Libraries/Image/RCTImageCache.m

@@ -54,11 +54,6 @@ - (instancetype)init
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (void)clearCache
 {
   [_decodedImageCache removeAllObjects];

Libraries/Image/RCTImageView.m

@@ -103,11 +103,6 @@ - (instancetype)initWithBridge:(RCTBridge *)bridge
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 RCT_NOT_IMPLEMENTED(- (instancetype)init)
 
 RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)aDecoder)

Libraries/Image/RCTUIImageViewAnimated.m

@@ -311,7 +311,6 @@ - (void)dealloc
   // Removes the display link from all run loop modes.
   [_displayLink invalidate];
   _displayLink = nil;
-  [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
 }
 
 - (void)didReceiveMemoryWarning:(NSNotification *)notification

Libraries/Settings/RCTSettingsManager.mm

@@ -52,11 +52,6 @@ - (instancetype)initWithUserDefaults:(NSUserDefaults *)defaults
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (facebook::react::ModuleConstants<JS::NativeSettingsManager::Constants>)constantsToExport
 {
   return (facebook::react::ModuleConstants<JS::NativeSettingsManager::Constants>)[self getConstants];

Libraries/Text/Text/RCTTextViewManager.m

@@ -50,11 +50,6 @@ - (void)setBridge:(RCTBridge *)bridge
                                                     lazilyLoadIfNecessary:YES]];
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (UIView *)view
 {
   return [RCTTextView new];

Libraries/Text/TextInput/Multiline/RCTUITextView.m

@@ -51,11 +51,6 @@ - (instancetype)initWithFrame:(CGRect)frame
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 #pragma mark - Accessibility
 
 - (void)setIsAccessibilityElement:(BOOL)isAccessibilityElement

Libraries/Text/TextInput/RCTBaseTextInputViewManager.m

@@ -95,11 +95,6 @@ - (void)setBridge:(RCTBridge *)bridge
                                                     lazilyLoadIfNecessary:YES]];
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 #pragma mark - RCTUIManagerObserver
 
 - (void)uiManagerWillPerformMounting:(__unused RCTUIManager *)uiManager

Libraries/Text/TextInput/Singleline/RCTUITextField.m

@@ -32,11 +32,6 @@ - (instancetype)initWithFrame:(CGRect)frame
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (void)_textDidChange
 {
   _textWasPasted = NO;

RNTester/RNTesterUnitTests/RCTModuleInitNotificationRaceTests.m

@@ -62,11 +62,6 @@ - (void)didInitViewManager:(NSNotification *)note
   }
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 @end
 
 @interface RCTModuleInitNotificationRaceTests : XCTestCase <RCTBridgeDelegate>

React/Base/RCTRootView.m

@@ -385,7 +385,6 @@ - (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
 
 - (void)dealloc
 {
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
   [_contentView invalidate];
 }
 

React/Base/Surface/RCTSurface.mm

@@ -106,7 +106,6 @@ - (instancetype)initWithBridge:(RCTBridge *)bridge
 - (void)dealloc
 {
   [self _stop];
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
 #pragma mark - Immutable Properties (no need to enforce synchronization)

React/CoreModules/RCTAccessibilityManager.mm

@@ -94,11 +94,6 @@ - (instancetype)init
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (void)didReceiveNewContentSizeCategory:(NSNotification *)note
 {
   self.contentSizeCategory = note.userInfo[UIContentSizeCategoryNewValueKey];

React/CoreModules/RCTDeviceInfo.h

@@ -8,8 +8,7 @@
 #import <UIKit/UIKit.h>
 
 #import <React/RCTBridge.h>
-#import <React/RCTBridgeModule.h>
 
-@interface RCTDeviceInfo : NSObject <RCTBridgeModule, RCTInvalidating>
+@interface RCTDeviceInfo : NSObject <RCTBridgeModule>
 
 @end

React/CoreModules/RCTDeviceInfo.mm

@@ -112,19 +112,6 @@ static BOOL RCTIsIPhoneX() {
   };
 }
 
-- (void)dealloc
-{
-  [NSNotificationCenter.defaultCenter removeObserver:self];
-}
-
-- (void)invalidate
-{
-  RCTExecuteOnMainQueue(^{
-    self->_bridge = nil;
-    [[NSNotificationCenter defaultCenter] removeObserver:self];
-  });
-}
-
 - (NSDictionary<NSString *, id> *)constantsToExport
 {
   return [self getConstants];

React/CoreModules/RCTTiming.mm

@@ -160,7 +160,6 @@ - (void)dealloc
 {
   [self markEndOfBackgroundTaskIfNeeded];
   [_sleepTimer invalidate];
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
 - (void)markStartOfBackgroundTaskIfNeeded

React/DevSupport/RCTDevLoadingView.m

@@ -34,11 +34,6 @@ + (void)setEnabled:(BOOL)enabled
   isEnabled = enabled;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 + (BOOL)requiresMainQueueSetup
 {
   return YES;

React/DevSupport/RCTDevMenu.m

@@ -157,9 +157,7 @@ - (void)invalidate
 {
   _presentedItems = nil;
   [_actionSheet dismissViewControllerAnimated:YES
-                                   completion:^(void){
-                                   }];
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
+                                   completion:^(void){}];
 }
 
 - (void)showOnShake
@@ -425,7 +423,7 @@ - (void)setDefaultJSBundle
 
   _presentedItems = items;
   [RCTPresentedViewController() presentViewController:_actionSheet animated:YES completion:nil];
-  
+
   [_bridge enqueueJSCall:@"RCTNativeAppEventEmitter"
                   method:@"emit"
                     args:@[@"RCTDevMenuShown"]

React/Fabric/RCTSurfacePresenterBridgeAdapter.mm

@@ -92,7 +92,6 @@ - (instancetype)initWithBridge:(RCTBridge *)bridge contextContainer:(ContextCont
 - (void)dealloc
 {
   [_surfacePresenter suspend];
-  [self _removeBridgeObservers:_bridge];
 }
 
 - (RCTBridge *)bridge

React/Modules/RCTDevSettings.mm

@@ -204,7 +204,6 @@ - (void)invalidate
 #if ENABLE_PACKAGER_CONNECTION
   [[RCTPackagerConnection sharedPackagerConnection] removeHandler:_reloadToken];
 #endif
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
 - (NSArray<NSString *> *)supportedEvents

React/Modules/RCTRedBox.m

@@ -210,7 +210,6 @@ - (void)dealloc
 {
     _stackTraceTableView.dataSource = nil;
     _stackTraceTableView.delegate = nil;
-    [[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
 - (NSString *)stripAnsi:(NSString *)text

React/Modules/RCTTVNavigationEventEmitter.m

@@ -32,11 +32,6 @@ - (instancetype)init
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (NSArray<NSString *> *)supportedEvents
 {
   return @[TVNavigationEventName];

React/Modules/RCTUIManager.m

@@ -88,11 +88,6 @@ + (BOOL)requiresMainQueueSetup
   return NO;
 }
 
-- (void)dealloc
-{
-  [NSNotificationCenter.defaultCenter removeObserver:self];
-}
-
 - (void)invalidate
 {
   /**
@@ -339,9 +334,9 @@ - (NSString *)viewNameForReactTag:(NSNumber *)reactTag
   if (name) {
     return name;
   }
-  
+
   UIView *view = _viewRegistry[reactTag];
-  
+
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wundeclared-selector"
 

ReactCommon/turbomodule/core/platform/ios/RCTTurboModuleManager.mm

@@ -118,11 +118,6 @@ - (instancetype)initWithBridge:(RCTBridge *)bridge delegate:(id<RCTTurboModuleMa
   return self;
 }
 
-- (void)dealloc
-{
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-}
-
 - (void)notifyAboutTurboModuleSetup:(const char *)name
 {
   NSString *moduleName = [[NSString alloc] initWithUTF8String:name];