Update views that show contacts to reflect updates.

// FREEBIE

Signal/Signal-Prefix.pch

@@ -15,8 +15,9 @@
     static const NSUInteger ddLogLevel = DDLogLevelInfo;
     #endif
 
-    #import "iOSVersions.h"
     #import <SignalServiceKit/Asserts.h>
+    #import "iOSVersions.h"
+    #import "OWSDispatch.h"
 
     #define SignalAlertView(title,msg) [[[UIAlertView alloc] initWithTitle:title message:msg delegate:nil cancelButtonTitle:NSLocalizedString(@"OK", @"") otherButtonTitles:nil, nil] show]
     #define SignalReportError [Pastelog reportErrorAndSubmitLogsWithAlertTitle:NSLocalizedString(@"ERROR_WAS_DETECTED_TITLE", @"") alertBody:NSLocalizedString(@"ERROR_WAS_DETECTED_SUBMIT", @"")];

Signal/src/contact/OWSContactsManager.h

@@ -8,6 +8,8 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+extern NSString *const OWSContactsManagerContactsDidChangeNotification;
+
 @class UIFont;
 
 /**

Signal/src/contact/OWSContactsManager.m

@@ -7,6 +7,8 @@
 
 typedef BOOL (^ContactSearchBlock)(id, NSUInteger, BOOL *);
 
+NSString *const OWSContactsManagerContactsDidChangeNotification = @"OWSContactsManagerContactsDidChangeNotification";
+
 @interface OWSContactsManager ()
 
 @property id addressBookReference;
@@ -101,6 +103,7 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
     [[ContactsUpdater sharedUpdater] updateSignalContactIntersectionWithABContacts:self.allContacts
                                                                            success:^{
                                                                                DDLogInfo(@"%@ Successfully intersected contacts.", self.tag);
+                                                                               [self fireContactsDidChange];
                                                                            }
                                                                            failure:^(NSError *error) {
                                                                                DDLogWarn(@"%@ Failed to intersect contacts with error: %@. Rescheduling", self.tag, error);
@@ -113,6 +116,13 @@ void onAddressBookChanged(ABAddressBookRef notifyAddressBook, CFDictionaryRef in
                                                                            }];
 }
 
+- (void)fireContactsDidChange {
+    AssertIsOnMainThread();
+
+    [[NSNotificationCenter defaultCenter] postNotificationName:OWSContactsManagerContactsDidChangeNotification
+                                                        object:nil];
+}
+
 - (void)pullLatestAddressBook {
     CFErrorRef creationError        = nil;
     ABAddressBookRef addressBookRef = ABAddressBookCreateWithOptions(NULL, &creationError);

Signal/src/view controllers/MessageComposeTableViewController.m

@@ -77,6 +77,8 @@ NSString *const MessageComposeTableViewControllerCellContact = @"ContactTableVie
     _contactsManager = [Environment getCurrent].contactsManager;
     _phoneNumberAccountSet = [NSMutableSet set];
     
+    [self observeNotifications];
+
     return self;
 }
 
@@ -89,9 +91,28 @@ NSString *const MessageComposeTableViewControllerCellContact = @"ContactTableVie
 
     _contactsManager = [Environment getCurrent].contactsManager;
 
+    [self observeNotifications];
+    
     return self;
 }
 
+- (void)observeNotifications
+{
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(contactsDidChange:)
+                                                 name:OWSContactsManagerContactsDidChangeNotification
+                                               object:nil];
+}
+
+- (void)dealloc
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+- (void)contactsDidChange:(NSNotification *)notification {
+    [self updateContacts];
+}
+
 - (void)viewDidLoad {
     [super viewDidLoad];
     [self.navigationController.navigationBar setTranslucent:NO];
@@ -613,12 +634,7 @@ NSString *const MessageComposeTableViewControllerCellContact = @"ContactTableVie
 - (void)refreshContacts {
     [[ContactsUpdater sharedUpdater] updateSignalContactIntersectionWithABContacts:self.contactsManager.allContacts
                                                                            success:^{
-            self.contacts = self.contactsManager.signalContacts;
-            dispatch_async(dispatch_get_main_queue(), ^{
-                [self updateSearchResultsForSearchController:self.searchController];
-                [self.tableView reloadData];
-                [self updateAfterRefreshTry];
-            });
+                                                                               [self updateContacts];
                                                                            }
                                                                            failure:^(NSError *error) {
                                                                                dispatch_async(dispatch_get_main_queue(), ^{
@@ -638,6 +654,15 @@ NSString *const MessageComposeTableViewControllerCellContact = @"ContactTableVie
     }
 }
 
+- (void)updateContacts {
+    self.contacts = self.contactsManager.signalContacts;
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [self updateSearchResultsForSearchController:self.searchController];
+        [self.tableView reloadData];
+        [self updateAfterRefreshTry];
+    });
+}
+
 #pragma mark - Navigation
 
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(nullable id)sender

Signal/src/view controllers/NewGroupViewController.m

@@ -68,6 +68,33 @@ static NSString *const kUnwindToMessagesViewSegue = @"UnwindToMessagesViewSegue"
                                                       contactsUpdater:[Environment getCurrent].contactsUpdater];
 
     _contactsManager = [Environment getCurrent].contactsManager;
+
+    [self observeNotifications];
+}
+
+- (void)observeNotifications
+{
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(contactsDidChange:)
+                                                 name:OWSContactsManagerContactsDidChangeNotification
+                                               object:nil];
+}
+
+- (void)dealloc
+{
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+- (void)contactsDidChange:(NSNotification *)notification {
+    [self updateContacts];
+}
+
+- (void)updateContacts {
+    AssertIsOnMainThread();
+
+    contacts = self.contactsManager.signalContacts;
+
+    [self.tableView reloadData];
 }
 
 - (void)configWithThread:(TSGroupThread *)gThread {
@@ -78,7 +105,7 @@ static NSString *const kUnwindToMessagesViewSegue = @"UnwindToMessagesViewSegue"
     [super viewDidLoad];
     [self.navigationController.navigationBar setTranslucent:NO];
 
-    contacts = [Environment getCurrent].contactsManager.signalContacts;
+    contacts = self.contactsManager.signalContacts;
 
 
     self.tableView.tableHeaderView.frame = CGRectMake(0, 0, 400, 44);