Ensure contact delegate helper is set during initialization.

// FREEBIE

Signal/src/ViewControllers/BlockListViewController.m

@@ -33,8 +33,7 @@ NS_ASSUME_NONNULL_BEGIN
 {
     [super loadView];
 
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
 
     self.title
         = NSLocalizedString(@"SETTINGS_BLOCK_LIST_TITLE", @"Label for the block list section of the settings view");

Signal/src/ViewControllers/ContactsViewHelper.h

@@ -32,7 +32,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface ContactsViewHelper : NSObject
 
-@property (nonatomic, weak) id<ContactsViewHelperDelegate> delegate;
+@property (nonatomic, readonly, weak) id<ContactsViewHelperDelegate> delegate;
 
 @property (nonatomic, readonly) OWSContactsManager *contactsManager;
 @property (nonatomic, readonly) OWSBlockingManager *blockingManager;
@@ -42,6 +42,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, readonly) NSArray<NSString *> *blockedPhoneNumbers;
 
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithDelegate:(id<ContactsViewHelperDelegate>)delegate;
+
 - (nullable SignalAccount *)signalAccountForRecipientId:(NSString *)recipientId;
 
 // This method is faster than OWSBlockingManager but

Signal/src/ViewControllers/ContactsViewHelper.m

@@ -26,19 +26,26 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic) NSArray<NSString *> *blockedPhoneNumbers;
 
+@property (nonatomic) BOOL suppressDelegateEvents;
+
 @end
 
 #pragma mark -
 
 @implementation ContactsViewHelper
 
-- (instancetype)init
+- (instancetype)initWithDelegate:(id<ContactsViewHelperDelegate>)delegate
 {
     self = [super init];
     if (!self) {
         return self;
     }
 
+    OWSAssert(delegate);
+    _delegate = delegate;
+
+    self.suppressDelegateEvents = YES;
+
     _blockingManager = [OWSBlockingManager sharedManager];
     _blockedPhoneNumbers = [_blockingManager blockedPhoneNumbers];
 
@@ -48,6 +55,8 @@ NS_ASSUME_NONNULL_BEGIN
 
     [self observeNotifications];
 
+    self.suppressDelegateEvents = NO;
+
     return self;
 }
 
@@ -98,7 +107,6 @@ NS_ASSUME_NONNULL_BEGIN
 {
     OWSAssert([NSThread isMainThread]);
 
-
     if ([self.delegate respondsToSelector:@selector(shouldHideLocalNumber)] && [self.delegate shouldHideLocalNumber] &&
         [self isCurrentUser:signalAccount]) {
 
@@ -154,7 +162,10 @@ NS_ASSUME_NONNULL_BEGIN
     self.signalAccounts = [signalAccounts copy];
     self.nonSignalContacts = nil;
 
-    [self.delegate contactsViewHelperDidUpdateContacts];
+    // Don't fire delegate "change" events during initialization.
+    if (!self.suppressDelegateEvents) {
+        [self.delegate contactsViewHelperDidUpdateContacts];
+    }
 }
 
 - (BOOL)doesSignalAccount:(SignalAccount *)signalAccount matchSearchTerm:(NSString *)searchTerm

Signal/src/ViewControllers/MessageComposeTableViewController.m

@@ -56,8 +56,7 @@ NS_ASSUME_NONNULL_BEGIN
 {
     [super loadView];
 
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
     _nonContactAccountSet = [NSMutableSet set];
 
     ReminderView *contactsPermissionReminderView = [[ReminderView alloc]

Signal/src/ViewControllers/NewGroupViewController.m

@@ -81,8 +81,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)commonInit
 {
     _messageSender = [Environment getCurrent].messageSender;
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
     _groupViewHelper = [GroupViewHelper new];
     _groupViewHelper.delegate = self;
 

Signal/src/ViewControllers/OWSConversationSettingsTableViewController.m

@@ -96,8 +96,7 @@ NS_ASSUME_NONNULL_BEGIN
     _contactsManager = [Environment getCurrent].contactsManager;
     _messageSender = [Environment getCurrent].messageSender;
     _blockingManager = [OWSBlockingManager sharedManager];
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
 }
 
 - (NSString *)threadName

Signal/src/ViewControllers/SelectRecipientViewController.m

@@ -58,8 +58,7 @@ NSString *const kSelectRecipientViewControllerCellIdentifier = @"kSelectRecipien
     self.view.backgroundColor = [UIColor whiteColor];
     [self.navigationController.navigationBar setTranslucent:NO];
 
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
 
     [self createViews];
 

Signal/src/ViewControllers/SelectThreadViewController.m

@@ -53,8 +53,7 @@ NS_ASSUME_NONNULL_BEGIN
 
     self.view.backgroundColor = [UIColor whiteColor];
 
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
     _threadViewHelper = [ThreadViewHelper new];
     _threadViewHelper.delegate = self;
 

Signal/src/ViewControllers/ShowGroupMembersViewController.m

@@ -62,8 +62,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)commonInit
 {
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
 }
 
 - (void)configWithThread:(TSGroupThread *)thread

Signal/src/ViewControllers/UpdateGroupViewController.m

@@ -82,8 +82,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)commonInit
 {
     _messageSender = [Environment getCurrent].messageSender;
-    _contactsViewHelper = [ContactsViewHelper new];
-    _contactsViewHelper.delegate = self;
+    _contactsViewHelper = [[ContactsViewHelper alloc] initWithDelegate:self];
     _groupViewHelper = [GroupViewHelper new];
     _groupViewHelper.delegate = self;