diff --git a/Signal/src/AppDelegate.m b/Signal/src/AppDelegate.m
index 890a13395..4865a188e 100644
--- a/Signal/src/AppDelegate.m
+++ b/Signal/src/AppDelegate.m
@@ -777,7 +777,10 @@ static NSTimeInterval launchStartedAt;
 
             OutboundCallInitiator *outboundCallInitiator = SignalApp.sharedApp.outboundCallInitiator;
             OWSAssert(outboundCallInitiator);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
             [outboundCallInitiator initiateCallWithHandle:phoneNumber];
+#pragma GCC diagnostic pop
         }];
         return YES;
     } else if ([userActivity.activityType isEqualToString:@"INStartAudioCallIntent"]) {
@@ -821,7 +824,10 @@ static NSTimeInterval launchStartedAt;
 
             OutboundCallInitiator *outboundCallInitiator = SignalApp.sharedApp.outboundCallInitiator;
             OWSAssert(outboundCallInitiator);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
             [outboundCallInitiator initiateCallWithHandle:phoneNumber];
+#pragma GCC diagnostic pop
         }];
         return YES;
     } else {
diff --git a/Signal/src/ViewControllers/ConversationView/ConversationViewController.m b/Signal/src/ViewControllers/ConversationView/ConversationViewController.m
index 789a54f39..6ffd11414 100644
--- a/Signal/src/ViewControllers/ConversationView/ConversationViewController.m
+++ b/Signal/src/ViewControllers/ConversationView/ConversationViewController.m
@@ -1456,7 +1456,10 @@ typedef enum : NSUInteger {
         return;
     }
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
     [self.outboundCallInitiator initiateCallWithRecipientId:self.thread.contactIdentifier isVideo:isVideo];
+#pragma GCC diagnostic pop
 }
 
 - (BOOL)canCall
diff --git a/Signal/src/ViewControllers/ConversationView/ConversationViewItem.m b/Signal/src/ViewControllers/ConversationView/ConversationViewItem.m
index c2ceae6a3..df71d3664 100644
--- a/Signal/src/ViewControllers/ConversationView/ConversationViewItem.m
+++ b/Signal/src/ViewControllers/ConversationView/ConversationViewItem.m
@@ -786,6 +786,11 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
         }
         case OWSMessageCellType_Unknown: {
             OWSFail(@"%@ No text to share", self.logTag);
+            break;
+        }
+        case OWSMessageCellType_ContactShare: {
+            OWSFail(@"%@ share contact not implemented.", self.logTag);
+            break;
         }
     }
 }
@@ -796,6 +801,7 @@ NSString *NSStringForOWSMessageCellType(OWSMessageCellType cellType)
         case OWSMessageCellType_Unknown:
         case OWSMessageCellType_TextMessage:
         case OWSMessageCellType_OversizeTextMessage:
+        case OWSMessageCellType_ContactShare:
             OWSFail(@"No media to share.");
             break;
         case OWSMessageCellType_StillImage:
diff --git a/Signal/src/ViewControllers/HomeView/HomeViewController.m b/Signal/src/ViewControllers/HomeView/HomeViewController.m
index 762155537..27a72a5ef 100644
--- a/Signal/src/ViewControllers/HomeView/HomeViewController.m
+++ b/Signal/src/ViewControllers/HomeView/HomeViewController.m
@@ -116,7 +116,10 @@ NSString *const kArchivedConversationsReuseIdentifier = @"kArchivedConversations
     _threadViewModelCache = [NSCache new];
 
     // Ensure ExperienceUpgradeFinder has been initialized.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
     [ExperienceUpgradeFinder sharedManager];
+#pragma GCC diagnostic pop
 
     [[NSNotificationCenter defaultCenter] addObserver:self
                                              selector:@selector(blockedPhoneNumbersDidChange:)
diff --git a/Signal/src/ViewControllers/NewContactThreadViewController.m b/Signal/src/ViewControllers/NewContactThreadViewController.m
index bc531085a..886ba2ba8 100644
--- a/Signal/src/ViewControllers/NewContactThreadViewController.m
+++ b/Signal/src/ViewControllers/NewContactThreadViewController.m
@@ -758,13 +758,7 @@ NS_ASSUME_NONNULL_BEGIN
         case MessageComposeResultCancelled:
             break;
         case MessageComposeResultFailed: {
-            UIAlertView *warningAlert =
-                [[UIAlertView alloc] initWithTitle:@""
-                                           message:NSLocalizedString(@"SEND_INVITE_FAILURE", @"")
-                                          delegate:nil
-                                 cancelButtonTitle:NSLocalizedString(@"OK", @"")
-                                 otherButtonTitles:nil];
-            [warningAlert show];
+            [OWSAlerts showErrorAlertWithMessage:NSLocalizedString(@"SEND_INVITE_FAILURE", @"")];
             break;
         }
         case MessageComposeResultSent: {
@@ -772,13 +766,8 @@ NS_ASSUME_NONNULL_BEGIN
                                      completion:^{
                                          DDLogDebug(@"view controller dismissed");
                                      }];
-            UIAlertView *successAlert = [[UIAlertView alloc]
-                    initWithTitle:@""
-                          message:NSLocalizedString(@"SEND_INVITE_SUCCESS", @"Alert body after invite succeeded")
-                         delegate:nil
-                cancelButtonTitle:NSLocalizedString(@"OK", @"")
-                otherButtonTitles:nil];
-            [successAlert show];
+            [OWSAlerts
+                showAlertWithTitle:NSLocalizedString(@"SEND_INVITE_SUCCESS", @"Alert body after invite succeeded")];
             break;
         }
         default:
diff --git a/Signal/src/network/PushManager.m b/Signal/src/network/PushManager.m
index 37859c532..1b5101346 100644
--- a/Signal/src/network/PushManager.m
+++ b/Signal/src/network/PushManager.m
@@ -112,13 +112,19 @@ NSString *const Signal_Message_MarkAsRead_Identifier = @"Signal_Message_MarkAsRe
     DDLogInfo(@"%@ received remote notification", self.logTag);
 
     [AppReadiness runNowOrWhenAppIsReady:^{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
         [self.messageFetcherJob run];
+#pragma GCC diagnostic pop
     }];
 }
 
 - (void)applicationDidBecomeActive {
     [AppReadiness runNowOrWhenAppIsReady:^{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-result"
         [self.messageFetcherJob run];
+#pragma GCC diagnostic pop
     }];
 }
 
diff --git a/SignalMessaging/attachments/SignalAttachment.swift b/SignalMessaging/attachments/SignalAttachment.swift
index b31dcd997..147b18ae2 100644
--- a/SignalMessaging/attachments/SignalAttachment.swift
+++ b/SignalMessaging/attachments/SignalAttachment.swift
@@ -39,7 +39,7 @@ extension String {
 }
 
 extension SignalAttachmentError: LocalizedError {
-    public var errorDescription: String {
+    public var errorDescription: String? {
         switch self {
         case .missingData:
             return NSLocalizedString("ATTACHMENT_ERROR_MISSING_DATA", comment: "Attachment error message for attachments without any data")
@@ -222,13 +222,21 @@ public class SignalAttachment: NSObject {
             owsFail("\(logTag) Missing error")
             return nil
         }
+        guard let errorDescription = error.errorDescription else {
+            owsFail("\(logTag) Missing error description")
+            return nil
+        }
 
-        return "\(error.errorDescription)"
+        return "\(errorDescription)"
     }
 
     @objc
     public class var missingDataErrorMessage: String {
-        return SignalAttachmentError.missingData.errorDescription
+        guard let errorDescription = SignalAttachmentError.missingData.errorDescription else {
+            owsFail("\(logTag) Missing error description")
+            return ""
+        }
+        return errorDescription
     }
 
     @objc
diff --git a/SignalMessaging/contacts/SystemContactsFetcher.swift b/SignalMessaging/contacts/SystemContactsFetcher.swift
index 672938ac5..b85abc582 100644
--- a/SignalMessaging/contacts/SystemContactsFetcher.swift
+++ b/SignalMessaging/contacts/SystemContactsFetcher.swift
@@ -185,7 +185,7 @@ public class SystemContactsFetcher: NSObject {
      * where we might need contact access, but will ensure we don't wastefully reload contacts
      * if we have already fetched contacts.
      *
-     * @param   completion  completion handler is called on main thread.
+     * @param   completionParam  completion handler is called on main thread.
      */
     @objc
     public func requestOnce(completion completionParam: ((Error?) -> Void)?) {
diff --git a/SignalMessaging/utils/OWSGroupAvatarBuilder.m b/SignalMessaging/utils/OWSGroupAvatarBuilder.m
index beb4f49fb..fd5648f32 100644
--- a/SignalMessaging/utils/OWSGroupAvatarBuilder.m
+++ b/SignalMessaging/utils/OWSGroupAvatarBuilder.m
@@ -1,9 +1,10 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSGroupAvatarBuilder.h"
 #import "TSGroupThread.h"
+
 NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSGroupAvatarBuilder ()
diff --git a/SignalServiceKit/src/Devices/OWSBlockedPhoneNumbersMessage.h b/SignalServiceKit/src/Devices/OWSBlockedPhoneNumbersMessage.h
index a0d37041f..81f450ad6 100644
--- a/SignalServiceKit/src/Devices/OWSBlockedPhoneNumbersMessage.h
+++ b/SignalServiceKit/src/Devices/OWSBlockedPhoneNumbersMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -8,7 +8,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSBlockedPhoneNumbersMessage : OWSOutgoingSyncMessage
 
-- (instancetype)initWithPhoneNumbers:(NSArray<NSString *> *)phoneNumbers;
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithPhoneNumbers:(NSArray<NSString *> *)phoneNumbers NS_DESIGNATED_INITIALIZER;
 
 @end
 
diff --git a/SignalServiceKit/src/Devices/OWSReadReceiptsForLinkedDevicesMessage.h b/SignalServiceKit/src/Devices/OWSReadReceiptsForLinkedDevicesMessage.h
index ae57b9910..b3fa2e54d 100644
--- a/SignalServiceKit/src/Devices/OWSReadReceiptsForLinkedDevicesMessage.h
+++ b/SignalServiceKit/src/Devices/OWSReadReceiptsForLinkedDevicesMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -10,7 +10,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSReadReceiptsForLinkedDevicesMessage : OWSOutgoingSyncMessage
 
-- (instancetype)initWithReadReceipts:(NSArray<OWSLinkedDeviceReadReceipt *> *)readReceipts;
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithReadReceipts:(NSArray<OWSLinkedDeviceReadReceipt *> *)readReceipts NS_DESIGNATED_INITIALIZER;
 
 @end
 
diff --git a/SignalServiceKit/src/Devices/OWSReadReceiptsForSenderMessage.h b/SignalServiceKit/src/Devices/OWSReadReceiptsForSenderMessage.h
index a3c2aaa5f..de15a8fa6 100644
--- a/SignalServiceKit/src/Devices/OWSReadReceiptsForSenderMessage.h
+++ b/SignalServiceKit/src/Devices/OWSReadReceiptsForSenderMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -10,6 +10,17 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSReadReceiptsForSenderMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithThread:(nullable TSThread *)thread messageTimestamps:(NSArray<NSNumber *> *)messageTimestamps;
 
 @end
diff --git a/SignalServiceKit/src/Devices/OWSVerificationStateSyncMessage.h b/SignalServiceKit/src/Devices/OWSVerificationStateSyncMessage.h
index a4411c5c8..a03a51c3e 100644
--- a/SignalServiceKit/src/Devices/OWSVerificationStateSyncMessage.h
+++ b/SignalServiceKit/src/Devices/OWSVerificationStateSyncMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -9,9 +9,11 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSVerificationStateSyncMessage : OWSOutgoingSyncMessage
 
+- (instancetype)init NS_UNAVAILABLE;
+
 - (instancetype)initWithVerificationState:(OWSVerificationState)verificationState
                               identityKey:(NSData *)identityKey
-               verificationForRecipientId:(NSString *)recipientId;
+               verificationForRecipientId:(NSString *)recipientId NS_DESIGNATED_INITIALIZER;
 
 // This is a clunky name, but we want to differentiate it from `recipientIdentifier` inherited from `TSOutgoingMessage`
 @property (nonatomic, readonly) NSString *verificationForRecipientId;
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSentMessageTranscript.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSentMessageTranscript.h
index 01d67c400..0aea4b869 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSentMessageTranscript.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSentMessageTranscript.h
@@ -1,4 +1,6 @@
-//  Copyright © 2016 Open Whisper Systems. All rights reserved.
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
 
 #import "OWSOutgoingSyncMessage.h"
 
@@ -12,7 +14,9 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface OWSOutgoingSentMessageTranscript : OWSOutgoingSyncMessage
 
-- (instancetype)initWithOutgoingMessage:(TSOutgoingMessage *)message;
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithOutgoingMessage:(TSOutgoingMessage *)message NS_DESIGNATED_INITIALIZER;
 
 @end
 
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.h
index 257d131c5..cdee6e9b5 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.h
@@ -1,4 +1,6 @@
-//  Copyright © 2016 Open Whisper Systems. All rights reserved.
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
 
 #import "TSOutgoingMessage.h"
 
@@ -11,6 +13,19 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface OWSOutgoingSyncMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h
index 7f15795ff..6391a0542 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncConfigurationMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -8,7 +8,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSSyncConfigurationMessage : OWSOutgoingSyncMessage
 
-- (instancetype)initWithReadReceiptsEnabled:(BOOL)readReceiptsEnabled;
+- (instancetype)init NS_UNAVAILABLE;
+
+- (instancetype)initWithReadReceiptsEnabled:(BOOL)readReceiptsEnabled NS_DESIGNATED_INITIALIZER;
 
 @end
 
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.h
index 3cd3a1ad1..356fe1ad0 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -7,14 +7,17 @@
 NS_ASSUME_NONNULL_BEGIN
 
 @protocol ProfileManagerProtocol;
-@class SignalAccount;
+
 @class OWSIdentityManager;
+@class SignalAccount;
 
 @interface OWSSyncContactsMessage : OWSOutgoingSyncMessage
 
+- (instancetype)init NS_UNAVAILABLE;
+
 - (instancetype)initWithSignalAccounts:(NSArray<SignalAccount *> *)signalAccounts
                        identityManager:(OWSIdentityManager *)identityManager
-                        profileManager:(id<ProfileManagerProtocol>)profileManager;
+                        profileManager:(id<ProfileManagerProtocol>)profileManager NS_DESIGNATED_INITIALIZER;
 
 - (NSData *)buildPlainTextAttachmentData;
 
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.m b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.m
index 966a7e9d3..7d5c85b5f 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.m
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncContactsMessage.m
@@ -30,16 +30,7 @@ NS_ASSUME_NONNULL_BEGIN
                        identityManager:(OWSIdentityManager *)identityManager
                         profileManager:(id<ProfileManagerProtocol>)profileManager
 {
-    self = [super initOutgoingMessageWithTimestamp:[NSDate ows_millisecondTimeStamp]
-                                          inThread:nil
-                                       messageBody:nil
-                                     attachmentIds:[NSMutableArray new]
-                                  expiresInSeconds:0
-                                   expireStartedAt:0
-                                    isVoiceMessage:NO
-                                  groupMetaMessage:TSGroupMessageUnspecified
-                                     quotedMessage:nil
-                                      contactShare:nil];
+    self = [super init];
     if (!self) {
         return self;
     }
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.h
index 212d3051b..261bbd0f1 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -10,6 +10,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSSyncGroupsMessage : OWSOutgoingSyncMessage
 
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
 - (NSData *)buildPlainTextAttachmentDataWithTransaction:(YapDatabaseReadTransaction *)transaction;
 
 @end
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.m b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.m
index 715b46b60..bd010f301 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.m
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.m
@@ -17,16 +17,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (instancetype)init
 {
-    return [super initOutgoingMessageWithTimestamp:[NSDate ows_millisecondTimeStamp]
-                                          inThread:nil
-                                       messageBody:nil
-                                     attachmentIds:[NSMutableArray new]
-                                  expiresInSeconds:0
-                                   expireStartedAt:0
-                                    isVoiceMessage:NO
-                                  groupMetaMessage:TSGroupMessageUnspecified
-                                     quotedMessage:nil
-                                      contactShare:nil];
+    return [super init];
 }
 
 - (OWSSignalServiceProtosSyncMessageBuilder *)syncMessageBuilder
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsRequestMessage.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsRequestMessage.h
index 344286b03..1c1be3442 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsRequestMessage.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsRequestMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSOutgoingSyncMessage.h"
@@ -8,7 +8,16 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSSyncGroupsRequestMessage : TSOutgoingMessage
 
-- (instancetype)init NS_UNAVAILABLE;
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
 
 - (instancetype)initWithThread:(nullable TSThread *)thread groupId:(NSData *)groupId;
 
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSContact.m b/SignalServiceKit/src/Messages/Interactions/OWSContact.m
index adfefa277..a05c514b8 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSContact.m
+++ b/SignalServiceKit/src/Messages/Interactions/OWSContact.m
@@ -495,7 +495,7 @@ NSString *NSStringForContactAddressType(OWSContactAddressType value)
     NSData *imageData = UIImageJPEGRepresentation(image, (CGFloat)0.9);
 
     TSAttachmentStream *attachmentStream = [[TSAttachmentStream alloc] initWithContentType:OWSMimeTypeImageJpeg
-                                                                                 byteCount:imageData.length
+                                                                                 byteCount:(UInt32)imageData.length
                                                                             sourceFilename:nil];
 
     NSError *error;
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSDisappearingMessagesConfigurationMessage.h b/SignalServiceKit/src/Messages/Interactions/OWSDisappearingMessagesConfigurationMessage.h
index 59ecc4c2f..37c9a3be8 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSDisappearingMessagesConfigurationMessage.h
+++ b/SignalServiceKit/src/Messages/Interactions/OWSDisappearingMessagesConfigurationMessage.h
@@ -1,5 +1,6 @@
-//  Created by Michael Kirk on 9/25/16.
-//  Copyright © 2016 Open Whisper Systems. All rights reserved.
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
 
 #import "TSOutgoingMessage.h"
 
@@ -9,6 +10,17 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSDisappearingMessagesConfigurationMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithConfiguration:(OWSDisappearingMessagesConfiguration *)configuration thread:(TSThread *)thread;
 
 @end
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSDynamicOutgoingMessage.h b/SignalServiceKit/src/Messages/Interactions/OWSDynamicOutgoingMessage.h
index eba50aa55..ea8f21e11 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSDynamicOutgoingMessage.h
+++ b/SignalServiceKit/src/Messages/Interactions/OWSDynamicOutgoingMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "TSOutgoingMessage.h"
@@ -13,6 +13,17 @@ typedef NSData *_Nonnull (^DynamicOutgoingMessageBlock)(SignalRecipient *);
 
 @interface OWSDynamicOutgoingMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithPlainTextDataBlock:(DynamicOutgoingMessageBlock)block thread:(nullable TSThread *)thread;
 - (instancetype)initWithPlainTextDataBlock:(DynamicOutgoingMessageBlock)block
                                  timestamp:(uint64_t)timestamp
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.h b/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.h
index 4e49289f9..62274ed32 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.h
+++ b/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.h
@@ -9,6 +9,17 @@ NS_ASSUME_NONNULL_BEGIN
 NS_SWIFT_NAME(EndSessionMessage)
 @interface OWSEndSessionMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithTimestamp:(uint64_t)timestamp inThread:(nullable TSThread *)thread NS_DESIGNATED_INITIALIZER;
 
 @end
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.m b/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.m
index 1b76988ee..6ad21affa 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.m
+++ b/SignalServiceKit/src/Messages/Interactions/OWSEndSessionMessage.m
@@ -9,6 +9,11 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSEndSessionMessage
 
+- (instancetype)initWithCoder:(NSCoder *)coder
+{
+    return [super initWithCoder:coder];
+}
+
 - (instancetype)initWithTimestamp:(uint64_t)timestamp inThread:(nullable TSThread *)thread
 {
     return [super initOutgoingMessageWithTimestamp:timestamp
diff --git a/SignalServiceKit/src/Messages/OWSMessageManager.m b/SignalServiceKit/src/Messages/OWSMessageManager.m
index 67097cfc1..7f1179ea1 100644
--- a/SignalServiceKit/src/Messages/OWSMessageManager.m
+++ b/SignalServiceKit/src/Messages/OWSMessageManager.m
@@ -705,7 +705,7 @@ NS_ASSUME_NONNULL_BEGIN
     } else if (syncMessage.hasBlocked) {
         NSArray<NSString *> *blockedPhoneNumbers = [syncMessage.blocked.numbers copy];
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-            [_blockingManager setBlockedPhoneNumbers:blockedPhoneNumbers sendSyncMessage:NO];
+            [self.blockingManager setBlockedPhoneNumbers:blockedPhoneNumbers sendSyncMessage:NO];
         });
     } else if (syncMessage.read.count > 0) {
         DDLogInfo(@"%@ Received %ld read receipt(s)", self.logTag, (u_long)syncMessage.read.count);
diff --git a/SignalServiceKit/src/Messages/OWSOutgoingCallMessage.h b/SignalServiceKit/src/Messages/OWSOutgoingCallMessage.h
index e74a27db4..314460b4e 100644
--- a/SignalServiceKit/src/Messages/OWSOutgoingCallMessage.h
+++ b/SignalServiceKit/src/Messages/OWSOutgoingCallMessage.h
@@ -1,17 +1,16 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "TSOutgoingMessage.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
-@class OWSCallOfferMessage;
 @class OWSCallAnswerMessage;
-@class OWSCallIceUpdateMessage;
-@class OWSCallHangupMessage;
 @class OWSCallBusyMessage;
-
+@class OWSCallHangupMessage;
+@class OWSCallIceUpdateMessage;
+@class OWSCallOfferMessage;
 @class TSThread;
 
 /**
@@ -19,6 +18,17 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface OWSOutgoingCallMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithThread:(TSThread *)thread offerMessage:(OWSCallOfferMessage *)offerMessage;
 - (instancetype)initWithThread:(TSThread *)thread answerMessage:(OWSCallAnswerMessage *)answerMessage;
 - (instancetype)initWithThread:(TSThread *)thread iceUpdateMessage:(OWSCallIceUpdateMessage *)iceUpdateMessage;
diff --git a/SignalServiceKit/src/Messages/OWSOutgoingNullMessage.h b/SignalServiceKit/src/Messages/OWSOutgoingNullMessage.h
index a42f09a22..f3a4d9c0d 100644
--- a/SignalServiceKit/src/Messages/OWSOutgoingNullMessage.h
+++ b/SignalServiceKit/src/Messages/OWSOutgoingNullMessage.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "TSOutgoingMessage.h"
@@ -11,6 +11,17 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSOutgoingNullMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithContactThread:(TSContactThread *)contactThread
          verificationStateSyncMessage:(OWSVerificationStateSyncMessage *)verificationStateSyncMessage;
 
diff --git a/SignalServiceKit/src/Messages/OWSProfileKeyMessage.h b/SignalServiceKit/src/Messages/OWSProfileKeyMessage.h
index b223199ac..e4ef1dbd2 100644
--- a/SignalServiceKit/src/Messages/OWSProfileKeyMessage.h
+++ b/SignalServiceKit/src/Messages/OWSProfileKeyMessage.h
@@ -8,6 +8,17 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSProfileKeyMessage : TSOutgoingMessage
 
+- (instancetype)initOutgoingMessageWithTimestamp:(uint64_t)timestamp
+                                        inThread:(nullable TSThread *)thread
+                                     messageBody:(nullable NSString *)body
+                                   attachmentIds:(NSMutableArray<NSString *> *)attachmentIds
+                                expiresInSeconds:(uint32_t)expiresInSeconds
+                                 expireStartedAt:(uint64_t)expireStartedAt
+                                  isVoiceMessage:(BOOL)isVoiceMessage
+                                groupMetaMessage:(TSGroupMetaMessage)groupMetaMessage
+                                   quotedMessage:(nullable TSQuotedMessage *)quotedMessage
+                                    contactShare:(nullable OWSContact *)contactShare NS_UNAVAILABLE;
+
 - (instancetype)initWithTimestamp:(uint64_t)timestamp inThread:(nullable TSThread *)thread NS_DESIGNATED_INITIALIZER;
 
 @end
diff --git a/SignalServiceKit/src/Security/SecurityUtils.m b/SignalServiceKit/src/Security/SecurityUtils.m
index 39a2ff575..3a4a68775 100644
--- a/SignalServiceKit/src/Security/SecurityUtils.m
+++ b/SignalServiceKit/src/Security/SecurityUtils.m
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "SecurityUtils.h"
@@ -9,7 +9,7 @@
 
 + (NSData *)generateRandomBytes:(NSUInteger)length
 {
-    return [Randomness generateRandomBytes:length];
+    return [Randomness generateRandomBytes:(int)length];
 }
 
 @end
diff --git a/SignalServiceKit/src/Storage/OWSMediaGalleryFinder.h b/SignalServiceKit/src/Storage/OWSMediaGalleryFinder.h
index 602e10a1e..3e15bfd78 100644
--- a/SignalServiceKit/src/Storage/OWSMediaGalleryFinder.h
+++ b/SignalServiceKit/src/Storage/OWSMediaGalleryFinder.h
@@ -11,6 +11,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface OWSMediaGalleryFinder : NSObject
 
+- (instancetype)init NS_UNAVAILABLE;
+
 - (instancetype)initWithThread:(TSThread *)thread NS_DESIGNATED_INITIALIZER;
 
 // How many media items a thread has