Add explanation messages to the “block user alert” and the block section of the 1:1 conversation settings view.

// FREEBIE

Signal/src/ViewControllers/BlockListUIUtils.m

@@ -99,7 +99,10 @@ typedef void (^BlockAlertCompletionBlock)();
                                 [self formatDisplayNameForAlertTitle:displayName]];
 
     UIAlertController *actionSheetController =
-        [UIAlertController alertControllerWithTitle:title message:nil preferredStyle:UIAlertControllerStyleActionSheet];
+        [UIAlertController alertControllerWithTitle:title
+                                            message:NSLocalizedString(@"BLOCK_LIST_BLOCK_ALERT_MESSAGE",
+                                                        @"The message of the 'block user' action sheet.")
+                                     preferredStyle:UIAlertControllerStyleActionSheet];
 
     UIAlertAction *unblockAction = [UIAlertAction
         actionWithTitle:NSLocalizedString(@"BLOCK_LIST_BLOCK_BUTTON", @"Button label for the 'block' button")

Signal/src/ViewControllers/OWSConversationSettingsTableViewController.m

@@ -194,6 +194,8 @@ static NSString *const OWSConversationSettingsTableViewControllerSegueShowGroupM
 
     __weak OWSConversationSettingsTableViewController *weakSelf = self;
 
+    // First section.
+
     NSMutableArray *firstSectionItems = [NSMutableArray new];
     if (!self.isGroupThread && self.thread.hasSafetyNumbers) {
         [firstSectionItems addObject:[OWSTableItem itemWithCustomCellBlock:^{
@@ -209,10 +211,30 @@ static NSString *const OWSConversationSettingsTableViewControllerSegueShowGroupM
                                          }]];
     }
 
+    [firstSectionItems addObject:[OWSTableItem itemWithCustomCellBlock:^{
+        weakSelf.toggleDisappearingMessagesCell.selectionStyle = UITableViewCellSelectionStyleNone;
+        return weakSelf.toggleDisappearingMessagesCell;
+    }
+                                                       customRowHeight:108.f
+                                                           actionBlock:nil]];
+
+    if (self.disappearingMessagesSwitch.isOn) {
+        [firstSectionItems addObject:[OWSTableItem itemWithCustomCellBlock:^{
+            weakSelf.disappearingMessagesDurationCell.selectionStyle = UITableViewCellSelectionStyleNone;
+            return weakSelf.disappearingMessagesDurationCell;
+        }
+                                                           customRowHeight:76.f
+                                                               actionBlock:nil]];
+    }
+
+    [contents addSection:[OWSTableSection sectionWithTitle:nil items:firstSectionItems]];
+
+    // Second section.
+
     if (!self.isGroupThread) {
         BOOL isBlocked = [[_blockingManager blockedPhoneNumbers] containsObject:self.signalId];
 
-        [firstSectionItems addObject:[OWSTableItem itemWithCustomCellBlock:^{
+        OWSTableItem *item = [OWSTableItem itemWithCustomCellBlock:^{
             UITableViewCell *cell = [UITableViewCell new];
             cell.textLabel.text = NSLocalizedString(
                 @"CONVERSATION_SETTINGS_BLOCK_THIS_USER", @"table cell label in conversation settings");
@@ -234,26 +256,17 @@ static NSString *const OWSConversationSettingsTableViewControllerSegueShowGroupM
             cell.accessoryView = blockUserSwitch;
             return cell;
         }
-                                                               actionBlock:nil]];
+                                                       actionBlock:nil];
+        OWSTableSection *section = [OWSTableSection sectionWithTitle:nil
+                                                               items:@[
+                                                                   item,
+                                                               ]];
+        section.footerTitle = NSLocalizedString(@"CONVERSATION_SETTINGS_BLOCK_FOOTER_TITLE",
+            @"A footer title for the block user option in the conversation settings");
+        [contents addSection:section];
     }
 
-    [firstSectionItems addObject:[OWSTableItem itemWithCustomCellBlock:^{
-        weakSelf.toggleDisappearingMessagesCell.selectionStyle = UITableViewCellSelectionStyleNone;
-        return weakSelf.toggleDisappearingMessagesCell;
-    }
-                                                       customRowHeight:108.f
-                                                           actionBlock:nil]];
-
-    if (self.disappearingMessagesSwitch.isOn) {
-        [firstSectionItems addObject:[OWSTableItem itemWithCustomCellBlock:^{
-            weakSelf.disappearingMessagesDurationCell.selectionStyle = UITableViewCellSelectionStyleNone;
-            return weakSelf.disappearingMessagesDurationCell;
-        }
-                                                           customRowHeight:76.f
-                                                               actionBlock:nil]];
-    }
-
-    [contents addSection:[OWSTableSection sectionWithTitle:nil items:firstSectionItems]];
+    // Third section.
 
     if (self.isGroupThread) {
         NSArray *groupItems = @[

Signal/src/ViewControllers/OWSTableViewController.h

@@ -21,9 +21,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSTableSection : NSObject
 
-@property (nonatomic, nullable) NSString *title;
+@property (nonatomic, nullable) NSString *headerTitle;
+@property (nonatomic, nullable) NSString *footerTitle;
 
-+ (OWSTableSection *)sectionWithTitle:(NSString *)title items:(NSArray<OWSTableItem *> *)items;
++ (OWSTableSection *)sectionWithTitle:(nullable NSString *)title items:(NSArray<OWSTableItem *> *)items;
 
 - (void)addItem:(OWSTableItem *)item;
 

Signal/src/ViewControllers/OWSTableViewController.m

@@ -45,10 +45,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSTableSection
 
-+ (OWSTableSection *)sectionWithTitle:(NSString *)title items:(NSArray<OWSTableItem *> *)items
++ (OWSTableSection *)sectionWithTitle:(nullable NSString *)title items:(NSArray<OWSTableItem *> *)items
 {
     OWSTableSection *section = [OWSTableSection new];
-    section.title = title;
+    section.headerTitle = title;
     section.items = [items mutableCopy];
     return section;
 }
@@ -224,7 +224,13 @@ NSString * const kOWSTableCellIdentifier = @"kOWSTableCellIdentifier";
 - (nullable NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)sectionIndex
 {
     OWSTableSection *section = [self sectionForIndex:sectionIndex];
-    return section.title;
+    return section.headerTitle;
+}
+
+- (nullable NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)sectionIndex
+{
+    OWSTableSection *section = [self sectionForIndex:sectionIndex];
+    return section.footerTitle;
 }
 
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

Signal/translations/en.lproj/Localizable.strings

@@ -97,6 +97,9 @@
 /* No comment provided by engineer. */
 "ATTACHMENT_QUEUED" = "New attachment queued for retrieval.";
 
+/* The message of the 'block user' action sheet. */
+"BLOCK_LIST_BLOCK_ALERT_MESSAGE" = "Blocked users will not be able to call you or send you messages.";
+
 /* Button label for the 'block' button */
 "BLOCK_LIST_BLOCK_BUTTON" = "Block";
 
@@ -217,6 +220,9 @@
 /* title for conversation settings screen */
 "CONVERSATION_SETTINGS" = "Conversation Settings";
 
+/* A footer title for the block user option in the conversation settings */
+"CONVERSATION_SETTINGS_BLOCK_FOOTER_TITLE" = "Blocked users will not be able to call you or send you messages.";
+
 /* table cell label in conversation settings */
 "CONVERSATION_SETTINGS_BLOCK_THIS_USER" = "Block this user";