VoiceOver: Make ScrollToBottomButton speakable

Riot/Assets/en.lproj/Vector.strings

@@ -250,6 +250,7 @@
 
 // Chat
 "room_jump_to_first_unread" = "Jump to first unread message";
+"room_accessiblity_scroll_to_bottom" = "Scroll to bottom";
 "room_new_message_notification" = "%d new message";
 "room_new_messages_notification" = "%d new messages";
 "room_one_user_is_typing" = "%@ is typing…";

Riot/Generated/Strings.swift

@@ -1506,6 +1506,10 @@ internal enum VectorL10n {
   internal static var roomAccessibilityUpload: String { 
     return VectorL10n.tr("Vector", "room_accessibility_upload") 
   }
+  /// Scroll to bottom
+  internal static var roomAccessiblityScrollToBottom: String { 
+    return VectorL10n.tr("Vector", "room_accessiblity_scroll_to_bottom") 
+  }
   /// Take photo or video
   internal static var roomActionCamera: String { 
     return VectorL10n.tr("Vector", "room_action_camera") 

Riot/Modules/Room/Views/Activities/RoomActivitiesView.m

@@ -307,6 +307,11 @@
         self.iconImageView.image = [UIImage imageNamed:@"scrolldown"];
     }
     self.iconImageView.hidden = NO;
+
+    // Make VoiceOver consider it as a button
+    self.iconImageView.accessibilityLabel = NSLocalizedStringFromTable(@"room_accessiblity_scroll_to_bottom", @"Vector", nil);
+    self.iconImageView.isAccessibilityElement = YES;
+    self.iconImageView.accessibilityTraits = UIAccessibilityTraitButton;
     
     if (onIconTapGesture)
     {