Add option to clear profile avatar.

// FREEBIE

Signal/src/ViewControllers/AvatarViewHelper.h

@@ -19,6 +19,14 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (UIViewController *)fromViewController;
 
+- (BOOL)hasClearAvatarAction;
+
+@optional
+
+- (NSString *)clearAvatarActionLabel;
+
+- (void)clearAvatar;
+
 @end
 
 #pragma mark -

Signal/src/ViewControllers/AvatarViewHelper.m

@@ -53,6 +53,15 @@ NS_ASSUME_NONNULL_BEGIN
                 }];
     [actionSheetController addAction:choosePictureAction];
 
+    if (self.delegate.hasClearAvatarAction) {
+        UIAlertAction *clearAction = [UIAlertAction actionWithTitle:self.delegate.clearAvatarActionLabel
+                                                              style:UIAlertActionStyleDefault
+                                                            handler:^(UIAlertAction *_Nonnull action) {
+                                                                [self.delegate clearAvatar];
+                                                            }];
+        [actionSheetController addAction:clearAction];
+    }
+
     [self.delegate.fromViewController presentViewController:actionSheetController animated:true completion:nil];
 }
 

Signal/src/ViewControllers/NewGroupViewController.m

@@ -626,6 +626,11 @@ const NSUInteger kNewGroupViewControllerAvatarWidth = 68;
     return self;
 }
 
+- (BOOL)hasClearAvatarAction
+{
+    return NO;
+}
+
 #pragma mark - AddToGroupViewControllerDelegate
 
 - (void)recipientIdWasAdded:(NSString *)recipientId

Signal/src/ViewControllers/ProfileViewController.m

@@ -272,7 +272,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (NSString *)avatarActionSheetTitle
 {
     return NSLocalizedString(
-        @"PROFILE_AVATAR_ACTIONSHEET_TITLE", @"Action Sheet title prompting the user for a profile avatar");
+        @"PROFILE_VIEW_AVATAR_ACTIONSHEET_TITLE", @"Action Sheet title prompting the user for a profile avatar");
 }
 
 - (void)avatarDidChange:(UIImage *)image
@@ -289,6 +289,21 @@ NS_ASSUME_NONNULL_BEGIN
     return self;
 }
 
+- (BOOL)hasClearAvatarAction
+{
+    return YES;
+}
+
+- (NSString *)clearAvatarActionLabel
+{
+    return NSLocalizedString(@"PROFILE_VIEW_CLEAR_AVATAR", @"Label for action that clear's the user's profile avatar");
+}
+
+- (void)clearAvatar
+{
+    self.avatar = nil;
+}
+
 #pragma mark - Logging
 
 + (NSString *)tag

Signal/src/ViewControllers/UpdateGroupViewController.m

@@ -507,6 +507,11 @@ NS_ASSUME_NONNULL_BEGIN
     return self;
 }
 
+- (BOOL)hasClearAvatarAction
+{
+    return NO;
+}
+
 #pragma mark - AddToGroupViewControllerDelegate
 
 - (void)recipientIdWasAdded:(NSString *)recipientId

Signal/translations/en.lproj/Localizable.strings

@@ -1037,7 +1037,7 @@
 "PROCEED_BUTTON" = "Proceed";
 
 /* Action Sheet title prompting the user for a profile avatar */
-"PROFILE_AVATAR_ACTIONSHEET_TITLE" = "Set Profile Avatar";
+"PROFILE_VIEW_AVATAR_ACTIONSHEET_TITLE" = "Set Profile Avatar";
 
 /* Instructions for how to change the profile avatar. */
 "PROFILE_VIEW_AVATAR_INSTRUCTIONS" = "Tap to Select Avatar";
@@ -1045,6 +1045,9 @@
 /* Header title for the profile avatar field of the profile view. */
 "PROFILE_VIEW_AVATAR_SECTION_HEADER" = "Avatar";
 
+/* Label for action that clear's the user's profile avatar */
+"PROFILE_VIEW_CLEAR_AVATAR" = "Clear Avatar";
+
 /* Default text for the profile name field of the profile view. */
 "PROFILE_VIEW_NAME_DEFAULT_TEXT" = "Enter your name.";
 

SignalServiceKit/src/Profiles/OWSProfilesManager.m

@@ -443,6 +443,8 @@ static const NSInteger kProfileKeyLength = 16;
     return profileAvatarsDirPath;
 }
 
+// TODO: We may want to clean up this directory in the "orphan cleanup" logic.
+
 #pragma mark - Notifications
 
 - (void)applicationDidBecomeActive:(NSNotification *)notification