Use new setBadgeCount API on iOS 16+

* The method `applicationIconBadgeNumber` is deprecated in iOS 17 - see https://developer.apple.com/documentation/uikit/uiapplication/applicationiconbadgenumber
* Its replacement is `setBadgeCount:withCompletionHandler:` but there is no equivalent getter.
* Use this new API on ios 16+ and swizzle it just like we do for applicationIconBadgeNumber

Author: nan-li

iOS_SDK/OneSignalSDK/OneSignalNotifications/Categories/UNUserNotificationCenter+OneSignalNotifications.m

@@ -97,6 +97,12 @@ + (void)swizzleSelectors {
         [OneSignalNotificationsUNUserNotificationCenter class],
         @selector(onesignalGetNotificationSettingsWithCompletionHandler:)
    );
+    injectSelector(
+        [UNUserNotificationCenter class],
+        @selector(setBadgeCount:withCompletionHandler:),
+        [OneSignalNotificationsUNUserNotificationCenter class],
+        @selector(onesignalSetBadgeCount:withCompletionHandler:)
+    );
 }
 
 + (void)registerDelegate {
@@ -167,6 +173,15 @@ - (void)onesignalGetNotificationSettingsWithCompletionHandler:(void(^)(UNNotific
     [self onesignalGetNotificationSettingsWithCompletionHandler:wrapperBlock];
 }
 
+/**
+ In order for the badge count to be consistent even in situations where the developer manually sets the badge number,
+ we swizzle the 'setBadgeCount()' method for ios 16+ to intercept these calls so we always know the latest count. This is especially
+ necessary as there is no equivalent "getBadgeCount" method available.
+ */
+- (void)onesignalSetBadgeCount:(NSInteger)badge withCompletionHandler:(void(^)(NSError *error))completionHandler {
+    [OneSignalBadgeHelpers updateCachedBadgeValue:badge];
+    [self onesignalSetBadgeCount:badge withCompletionHandler:completionHandler];
+}
 
 // A Set to keep track of which classes we have already swizzled so we only
 // swizzle each one once. If we swizzled more than once then this will create

iOS_SDK/OneSignalSDK/OneSignalNotifications/OSNotificationsManager.m

@@ -802,9 +802,17 @@ + (void)clearBadgeCount:(BOOL)fromNotifOpened fromClearAll:(BOOL)fromClearAll {
     bool wasBadgeSet = [UIApplication sharedApplication].applicationIconBadgeNumber > 0;
 
     if (fromNotifOpened || wasBadgeSet) {
-        [OneSignalCoreHelper runOnMainThread:^{
-            [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
-        }];
+        if (@available(iOS 16.0, *)) {
+            [[UNUserNotificationCenter currentNotificationCenter] setBadgeCount:0 withCompletionHandler:^(NSError * _Nullable error) {
+                if (error) {
+                    [OneSignalLog onesignalLog:ONE_S_LL_ERROR message:[NSString stringWithFormat:@"clearBadgeCount encountered error setting badge count: %@", error]];
+                }
+            }];
+        } else {
+            [OneSignalCoreHelper runOnMainThread:^{
+                [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
+            }];
+        }
     }
 }