Clean up ahead of PR.

Signal/src/ViewControllers/OWS2FASettingsViewController.m

@@ -38,6 +38,16 @@ NS_ASSUME_NONNULL_BEGIN
     self.title = NSLocalizedString(@"ENABLE_2FA_VIEW_TITLE", @"Title for the 'enable two factor auth PIN' views.");
 
     [self createContents];
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(stateDidChange:)
+                                                 name:NSNotificationName_2FAStateDidChange
+                                               object:nil];
+}
+
+- (void)dealloc
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
 }
 
 - (void)createContents
@@ -72,15 +82,8 @@ NS_ASSUME_NONNULL_BEGIN
 
     [super viewWillAppear:animated];
 
-    if (self.mode == OWS2FASettingsMode_Status) {
-        // Ever time we re-enter the "status" view, recreate its
-        // contents wholesale since we may have just enabled or
-        // disabled 2FA.
-        [self createContents];
-    } else {
-        // If we're using a table, refresh its contents.
-        [self updateTableContents];
-    }
+    // If we're using a table, refresh its contents.
+    [self updateTableContents];
 
     [self updateNavigationItems];
 }
@@ -413,7 +416,7 @@ NS_ASSUME_NONNULL_BEGIN
                       }
                           failure:^(NSError *error) {
                               [modalActivityIndicator dismissWithCompletion:^{
-                                  [weakSelf createContents];
+                                  [weakSelf updateTableContents];
 
                                   [OWSAlerts
                                       showAlertWithTitle:NSLocalizedString(@"ALERT_ERROR_TITLE", @"")
@@ -477,6 +480,15 @@ NS_ASSUME_NONNULL_BEGIN
     [self.navigationController popViewControllerAnimated:YES];
 }
 
+- (void)stateDidChange:(NSNotification *)notification
+{
+    DDLogInfo(@"%@ %s", self.logTag, __PRETTY_FUNCTION__);
+
+    if (self.mode == OWS2FASettingsMode_Status) {
+        [self createContents];
+    }
+}
+
 @end
 
 NS_ASSUME_NONNULL_END

SignalServiceKit/src/Util/OWS2FAManager.h

@@ -4,6 +4,8 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+extern NSString *const NSNotificationName_2FAStateDidChange;
+
 typedef void (^OWS2FASuccess)(void);
 typedef void (^OWS2FAFailure)(NSError *error);
 

SignalServiceKit/src/Util/OWS2FAManager.m

@@ -3,6 +3,7 @@
 //
 
 #import "OWS2FAManager.h"
+#import "NSNotificationCenter+OWS.h"
 #import "OWSRequestFactory.h"
 #import "TSNetworkManager.h"
 #import "TSStorageManager.h"
@@ -10,6 +11,8 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+NSString *const NSNotificationName_2FAStateDidChange = @"NSNotificationName_2FAStateDidChange";
+
 NSString *const kOWS2FAManager_Collection = @"kOWS2FAManager_Collection";
 NSString *const kOWS2FAManager_IsEnabledKey = @"kOWS2FAManager_IsEnabledKey";
 
@@ -72,6 +75,10 @@ NSString *const kOWS2FAManager_IsEnabledKey = @"kOWS2FAManager_IsEnabledKey";
 - (void)setIs2FAEnabled:(BOOL)value
 {
     [self.dbConnection setBool:value forKey:kOWS2FAManager_IsEnabledKey inCollection:kOWS2FAManager_Collection];
+
+    [[NSNotificationCenter defaultCenter] postNotificationNameAsync:NSNotificationName_2FAStateDidChange
+                                                             object:nil
+                                                           userInfo:nil];
 }
 
 - (void)enable2FAWithPin:(NSString *)pin success:(nullable OWS2FASuccess)success failure:(nullable OWS2FAFailure)failure