Apply "disappearing messages disabled" icon.

Signal/Images.xcassets/ic_timer_disabled.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "timer-disabled-48@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "timer-disabled-48@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "timer-disabled-48@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Signal/Images.xcassets/system_message_disappearing_messages.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "timer-20@1x.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "timer-20@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "timer-20@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Signal/src/ViewControllers/ConversationView/Cells/OWSSystemMessageCell.m

@@ -237,8 +237,13 @@ typedef void (^SystemMessageActionBlock)(void);
             case TSInfoMessageAddGroupToProfileWhitelistOffer:
             case TSInfoMessageTypeGroupUpdate:
             case TSInfoMessageTypeGroupQuit:
-            case TSInfoMessageTypeDisappearingMessagesUpdate:
                 return nil;
+            case TSInfoMessageTypeDisappearingMessagesUpdate: {
+                //                OWSDisappearingConfigurationUpdateInfoMessage *configurationUpdate =
+                //                (OWSDisappearingConfigurationUpdateInfoMessage *)interaction; configurationIsEnabled
+                result = [UIImage imageNamed:@"system_message_disappearing_messages"];
+                break;
+            }
             case TSInfoMessageVerificationStateChange:
                 OWSAssert([interaction isKindOfClass:[OWSVerificationStateChangeMessage class]]);
                 if ([interaction isKindOfClass:[OWSVerificationStateChangeMessage class]]) {

Signal/src/ViewControllers/ThreadSettings/OWSConversationSettingsViewController.m

@@ -378,7 +378,10 @@ const CGFloat kIconViewLength = 24;
                                  [topView autoPinEdgeToSuperviewEdge:ALEdgeTop];
                                  [topView autoSetDimension:ALDimensionHeight toSize:kOWSTable_DefaultCellHeight];
 
-                                 UIImageView *iconView = [strongSelf viewForIconWithName:@"ic_timer"];
+                                 NSString *iconName
+                                     = (strongSelf.disappearingMessagesConfiguration.isEnabled ? @"ic_timer"
+                                                                                               : @"ic_timer_disabled");
+                                 UIImageView *iconView = [strongSelf viewForIconWithName:iconName];
                                  [topView addSubview:iconView];
                                  [iconView autoVCenterInSuperview];
                                  [iconView autoPinLeadingToSuperviewMargin];

SignalServiceKit/src/Messages/Interactions/OWSDisappearingConfigurationUpdateInfoMessage.h

@@ -11,6 +11,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSDisappearingConfigurationUpdateInfoMessage : TSInfoMessage
 
+@property (nonatomic, readonly) BOOL configurationIsEnabled;
+
 /**
  * @param remoteName is nil when created by the local user
  */

SignalServiceKit/src/Messages/Interactions/OWSDisappearingConfigurationUpdateInfoMessage.m

@@ -12,7 +12,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, readonly, nullable) NSString *createdByRemoteName;
 @property (nonatomic, readonly) BOOL createdInExistingGroup;
-@property (nonatomic, readonly) BOOL configurationIsEnabled;
 @property (nonatomic, readonly) uint32_t configurationDurationSeconds;
 
 @end