Restart timer animation when returning from background

// FREEBIE

Author: michaelkirk

Signal/src/view controllers/MessagesViewController.m

@@ -305,6 +305,10 @@ - (void)toggleObservers:(BOOL)shouldObserve
                                                  selector:@selector(startReadTimer)
                                                      name:UIApplicationWillEnterForegroundNotification
                                                    object:nil];
+        [[NSNotificationCenter defaultCenter] addObserver:self
+                                                 selector:@selector(startExpirationTimerAnimations)
+                                                     name:UIApplicationWillEnterForegroundNotification
+                                                   object:nil];
         [[NSNotificationCenter defaultCenter] addObserver:self
                                                  selector:@selector(cancelReadTimer)
                                                      name:UIApplicationDidEnterBackgroundNotification
@@ -349,8 +353,7 @@ - (void)viewWillAppear:(BOOL)animated
     [self.thread touch];
 
     // restart any animations that were stopped e.g. while inspecting the contact info screens.
-    [[NSNotificationCenter defaultCenter] postNotificationName:OWSMessagesViewControllerDidAppearNotification
-                                                        object:nil];
+    [self startExpirationTimerAnimations];
 
     OWSDisappearingMessagesConfiguration *configuration =
         [OWSDisappearingMessagesConfiguration fetchObjectWithUniqueID:self.thread.uniqueId];
@@ -437,6 +440,12 @@ - (void)viewWillDisappear:(BOOL)animated {
     [self saveDraft];
 }
 
+- (void)startExpirationTimerAnimations
+{
+    [[NSNotificationCenter defaultCenter] postNotificationName:OWSMessagesViewControllerDidAppearNotification
+                                                        object:nil];
+}
+
 - (void)viewDidDisappear:(BOOL)animated {
     [super viewDidDisappear:animated];
     self.inputToolbar.contentView.textView.editable = NO;