handle app notifications

ios/app/BUILD.gn

@@ -41,5 +41,6 @@ source_set("app") {
 
   frameworks = [
     "Foundation.framework",
+    "UIKit.framework",
   ]
 }

ios/app/brave_core_main.h

@@ -12,11 +12,11 @@ OBJC_EXPORT
 
 - (instancetype)init;
 
-- (instancetype)initWithSyncServiceURL:(NSString *)syncServiceURL;
+- (instancetype)initWithSyncServiceURL:(NSString*)syncServiceURL;
 
 - (void)scheduleLowPriorityStartupTasks;
 
-- (void)setUserAgent:(NSString *)userAgent;
+- (void)setUserAgent:(NSString*)userAgent;
 
 @end
 

ios/app/brave_core_main.mm

@@ -5,19 +5,20 @@
 
 #import "brave/ios/app/brave_core_main.h"
 
+#import <UIKit/UIKit.h>
+
 #include "base/strings/sys_string_conversions.h"
 #include "brave/ios/app/brave_main_delegate.h"
 #import "brave/ios/browser/brave_web_client.h"
+#include "ios/chrome/app/startup/provider_registration.h"
 #import "ios/chrome/app/startup_tasks.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state_manager.h"
-#include "ios/chrome/app/startup/provider_registration.h"
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #include "ios/web/public/init/web_main.h"
 
-@interface BraveCoreMain()
-{
+@interface BraveCoreMain () {
   std::unique_ptr<BraveWebClient> _webClient;
   std::unique_ptr<BraveMainDelegate> _delegate;
   std::unique_ptr<web::WebMain> _webMain;
@@ -31,8 +32,27 @@
   return [self initWithSyncServiceURL:@""];
 }
 
-- (instancetype)initWithSyncServiceURL:(NSString *)syncServiceURL {
+- (instancetype)initWithSyncServiceURL:(NSString*)syncServiceURL {
   if ((self = [super init])) {
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(onAppEnterBackground:)
+               name:UIApplicationDidEnterBackgroundNotification
+             object:nil];
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(onAppEnterForeground:)
+               name:UIApplicationWillEnterForegroundNotification
+             object:nil];
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(onAppWillTerminate:)
+               name:UIApplicationWillTerminateNotification
+             object:nil];
+
+
+
+
     // Register all providers before calling any Chromium code.
     [ProviderRegistration registerProviders];
 
@@ -43,7 +63,6 @@
     _delegate->SetSyncServiceURL(base::SysNSStringToUTF8(syncServiceURL));
 
     web::WebMainParams params(_delegate.get());
-
     _webMain = std::make_unique<web::WebMain>(std::move(params));
 
     ios::GetChromeBrowserProvider()->Initialize();
@@ -57,19 +76,35 @@
   return self;
 }
 
+- (void)onAppEnterBackground:(NSNotification*)notification {
+  auto* context = GetApplicationContext();
+  if (context)
+    context->OnAppEnterBackground();
+}
+
+- (void)onAppEnterForeground:(NSNotification*)notification {
+  auto* context = GetApplicationContext();
+  if (context)
+    context->OnAppEnterForeground();
+}
+
+- (void)onAppWillTerminate:(NSNotification*)notification {
+  _webMain.reset();
+}
+
 - (void)scheduleLowPriorityStartupTasks {
-  [StartupTasks
-      scheduleDeferredBrowserStateInitialization:_mainBrowserState];
+  [StartupTasks scheduleDeferredBrowserStateInitialization:_mainBrowserState];
 }
 
 - (void)dealloc {
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
   _mainBrowserState = nullptr;
   _webMain.reset();
   _delegate.reset();
   _webClient.reset();
 }
 
-- (void)setUserAgent:(NSString *)userAgent {
+- (void)setUserAgent:(NSString*)userAgent {
   _webClient->SetUserAgent(base::SysNSStringToUTF8(userAgent));
 }