Migrate to Swift 4.

Signal/src/Jobs/MultiDeviceProfileKeyUpdateJob.swift

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 import Foundation
@@ -12,7 +12,7 @@ import SignalMessaging
  * Syncing is accomplished via the existing contact syncing mechanism, except the only contact synced is ourself. It's incumbent on the linked device
  * to treat this "self contact" record specially.
  */
-@objc class MultiDeviceProfileKeyUpdateJob: NSObject {
+@objc public class MultiDeviceProfileKeyUpdateJob: NSObject {
 
     let TAG = "[MultiDeviceProfileKeyUpdateJob]"
 
@@ -21,7 +21,7 @@ import SignalMessaging
     let messageSender: MessageSender
     let profileManager: OWSProfileManager
 
-    required init(profileKey: OWSAES256Key, identityManager: OWSIdentityManager, messageSender: MessageSender, profileManager: OWSProfileManager) {
+   @objc public required init(profileKey: OWSAES256Key, identityManager: OWSIdentityManager, messageSender: MessageSender, profileManager: OWSProfileManager) {
         self.profileKey = profileKey
 
         self.identityManager = identityManager

Signal/src/Jobs/SessionResetJob.swift

@@ -7,7 +7,7 @@ import PromiseKit
 import SignalServiceKit
 
 @objc(OWSSessionResetJob)
-class SessionResetJob: NSObject {
+public class SessionResetJob: NSObject {
 
     let TAG = "SessionResetJob"
 
@@ -16,7 +16,7 @@ class SessionResetJob: NSObject {
     let primaryStorage: OWSPrimaryStorage
     let messageSender: MessageSender
 
-    required init(recipientId: String, thread: TSThread, messageSender: MessageSender, primaryStorage: OWSPrimaryStorage) {
+    @objc public required init(recipientId: String, thread: TSThread, messageSender: MessageSender, primaryStorage: OWSPrimaryStorage) {
         self.thread = thread
         self.recipientId = recipientId
         self.messageSender = messageSender

Signal/src/call/CallService.swift

@@ -338,7 +338,7 @@ private class SignalCallData: NSObject {
     /**
      * Choose whether to use CallKit or a Notification backed interface for calling.
      */
-    public func createCallUIAdapter() {
+    @objc public func createCallUIAdapter() {
         SwiftAssertIsOnMainThread(#function)
 
         if self.call != nil {

Signal/src/call/UserInterface/CallUIAdapter.swift

@@ -167,7 +167,7 @@ extension CallUIAdaptee {
         adaptee.answerCall(call)
     }
 
-    internal func declineCall(localId: UUID) {
+    @objc public func declineCall(localId: UUID) {
         SwiftAssertIsOnMainThread(#function)
 
         adaptee.declineCall(localId: localId)
@@ -187,7 +187,7 @@ extension CallUIAdaptee {
         }
     }
 
-    internal func startAndShowOutgoingCall(recipientId: String, hasLocalVideo: Bool) {
+    @objc public func startAndShowOutgoingCall(recipientId: String, hasLocalVideo: Bool) {
         SwiftAssertIsOnMainThread(#function)
 
         adaptee.startAndShowOutgoingCall(recipientId: recipientId, hasLocalVideo: hasLocalVideo)

Signal/src/util/TextFieldHelper.swift

@@ -5,11 +5,11 @@
 import Foundation
 import UIKit
 
-@objc class TextFieldHelper: NSObject {
+@objc public class TextFieldHelper: NSObject {
 
     // Used to implement the UITextFieldDelegate method: `textField:shouldChangeCharactersInRange:replacementString`
     // Takes advantage of Swift's superior unicode handling to append partial pasted text without splitting multi-byte characters.
-    class func textField(_ textField: UITextField, shouldChangeCharactersInRange editingRange: NSRange, replacementString: String, byteLimit: UInt) -> Bool {
+    @objc public class func textField(_ textField: UITextField, shouldChangeCharactersInRange editingRange: NSRange, replacementString: String, byteLimit: UInt) -> Bool {
 
         let byteLength = { (string: String) -> UInt in
             return UInt(string.utf8.count)