Design polish for the "profile pic in conversation view" and "archived conversations in home view."

Signal/src/ViewControllers/ConversationView/ConversationHeaderView.swift

@@ -74,7 +74,7 @@ public class ConversationHeaderView: UIStackView {
         textRows.distribution = .fillProportionally
         textRows.spacing = 0
 
-        textRows.layoutMargins = UIEdgeInsets(top: 0, left: 4, bottom: 0, right: 4)
+        textRows.layoutMargins = UIEdgeInsets(top: 0, left: 8, bottom: 0, right: 8)
         textRows.isLayoutMarginsRelativeArrangement = true
 
         // low content hugging so that the text rows push container to the right bar button item(s)

Signal/src/ViewControllers/HomeView/HomeViewController.m

@@ -274,6 +274,18 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
             break;
     }
 
+    [self applyDefaultBackButton];
+
+    if ([self.traitCollection respondsToSelector:@selector(forceTouchCapability)]
+        && (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable)) {
+        [self registerForPreviewingWithDelegate:self sourceView:self.tableView];
+    }
+
+    [self updateBarButtonItems];
+}
+
+- (void)applyDefaultBackButton
+{
     // We don't show any text for the back button, so there's no need to localize it. But because we left align the
     // conversation title view, we add a little tappable padding after the back button, by having a title of spaces.
     // Admittedly this is kind of a hack and not super fine grained, but it's simple and results in the interactive pop
@@ -284,13 +296,15 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
 
     self.navigationItem.backBarButtonItem =
         [[UIBarButtonItem alloc] initWithTitle:paddingString style:UIBarButtonItemStylePlain target:nil action:nil];
+}
 
-    if ([self.traitCollection respondsToSelector:@selector(forceTouchCapability)]
-        && (self.traitCollection.forceTouchCapability == UIForceTouchCapabilityAvailable)) {
-        [self registerForPreviewingWithDelegate:self sourceView:self.tableView];
-    }
-
-    [self updateBarButtonItems];
+- (void)applyArchiveBackButton
+{
+    self.navigationItem.backBarButtonItem =
+        [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"BACK_BUTTON", @"button text for back button")
+                                         style:UIBarButtonItemStylePlain
+                                        target:nil
+                                        action:nil];
 }
 
 - (void)viewDidAppear:(BOOL)animated
@@ -298,6 +312,7 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
     [super viewDidAppear:animated];
 
     [self displayAnyUnseenUpgradeExperience];
+    [self applyDefaultBackButton];
 }
 
 - (void)updateBarButtonItems
@@ -408,6 +423,7 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
 - (void)viewWillAppear:(BOOL)animated
 {
     [super viewWillAppear:animated];
+
     __block BOOL hasAnyMessages;
     [self.uiDatabaseConnection readWithBlock:^(YapDatabaseReadTransaction * _Nonnull transaction) {
         hasAnyMessages = [self hasAnyMessagesWithTransaction:transaction];
@@ -442,6 +458,7 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
     }
 
     [self checkIfEmptyView];
+    [self applyDefaultBackButton];
 }
 
 - (void)viewWillDisappear:(BOOL)animated
@@ -985,6 +1002,10 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
 {
     OWSAssert(self.homeViewMode == HomeViewMode_Inbox);
 
+    // When showing archived conversations, we want to use a conventional "back" button
+    // to return to the "inbox" home view.
+    [self applyArchiveBackButton];
+
     // Push a separate instance of this view using "archive" mode.
     HomeViewController *homeView = [HomeViewController new];
     homeView.homeViewMode = HomeViewMode_Archive;

Signal/src/views/ReminderView.swift

@@ -79,17 +79,29 @@ class ReminderView: UIView {
 
         self.addSubview(container)
         container.autoPinWidthToSuperview(withMargin: 16)
-        container.autoPinHeightToSuperview(withMargin: 16)
+        switch (mode) {
+        case .nag:
+            container.autoPinHeightToSuperview(withMargin: 16)
+        case .explanation:
+            container.autoPinHeightToSuperview(withMargin: 12)
+        }
+
+        // Margin: top and bottom 12 left and right 16.
 
         // Label
-        label.font = UIFont.ows_regularFont(withSize: 14)
+        switch (mode) {
+        case .nag:
+            label.font = UIFont.ows_regularFont(withSize: 14)
+        case .explanation:
+            label.font = UIFont.ows_dynamicTypeSubheadline
+        }
         container.addSubview(label)
+        label.textColor = UIColor.black.withAlphaComponent(0.9)
         label.numberOfLines = 0
         label.lineBreakMode = .byWordWrapping
-        label.autoPinEdge(toSuperviewEdge: .top)
         label.autoPinLeadingToSuperviewMargin()
+        label.autoPinEdge(toSuperviewEdge: .top)
         label.autoPinEdge(toSuperviewEdge: .bottom)
-        label.textColor = UIColor.black.withAlphaComponent(0.9)
 
         guard mode == .nag else {
             label.autoPinTrailingToSuperviewMargin()