Update to swift 4.2

abtesting/ABTestingExample/AppDelegate.swift

@@ -22,7 +22,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
   var window: UIWindow?
 
-  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     FirebaseApp.configure()
     return true
   }

abtesting/ABTestingExample/ViewController.swift

@@ -87,8 +87,13 @@ class ViewController: UIViewController, UITableViewDataSource {
   }
 
   @objc func printInstanceIDToken() {
-    let instanceID = InstanceID.instanceID().token() ?? "null"
-    print("InstanceID token: \(instanceID)")
+    InstanceID.instanceID().instanceID { (result, error) in
+        if let error = error {
+            print("Error fetching remote instange ID: \(error)")
+        } else if let result = result {
+            print("Remote instance ID token: \(result.token)")
+        }
+    }
   }
 
   deinit {
@@ -104,7 +109,7 @@ class ViewController: UIViewController, UITableViewDataSource {
       navigationController?.navigationBar.barTintColor = ViewController.lightColors.primary
       navigationController?.navigationBar.barStyle = .`default`
       navigationController?.navigationBar.titleTextAttributes = [
-        NSAttributedStringKey.foregroundColor: UIColor.black
+        NSAttributedString.Key.foregroundColor: UIColor.black
       ]
       tableView.separatorColor = .gray
       tableView.backgroundColor = UIColor(red: 0.94, green: 0.94, blue: 0.94, alpha: 1)
@@ -113,7 +118,7 @@ class ViewController: UIViewController, UITableViewDataSource {
       navigationController?.navigationBar.barTintColor = ViewController.darkColors.primary
       navigationController?.navigationBar.barStyle = .black
       navigationController?.navigationBar.titleTextAttributes = [
-        NSAttributedStringKey.foregroundColor: UIColor.white
+        NSAttributedString.Key.foregroundColor: UIColor.white
       ]
       tableView.separatorColor = .lightGray
       tableView.backgroundColor = ViewController.darkColors.secondary

admob/AdMobExampleSwift/AppDelegate.swift

@@ -26,7 +26,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
   var window: UIWindow?
 
-  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     // Use Firebase library to configure APIs
     FirebaseApp.configure()
     return true

analytics/AnalyticsExampleSwift/AppDelegate.swift

@@ -22,7 +22,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
   var window: UIWindow?
 
-  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
 
     // [START tracker_swift]
     FirebaseApp.configure()

authentication/AuthenticationExampleSwift/AppDelegate.swift

@@ -35,7 +35,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
   var window: UIWindow?
 
   func application(_ application: UIApplication, didFinishLaunchingWithOptions
-      launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+      launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     // [START firebase_configure]
     // Use Firebase library to configure APIs
     FirebaseApp.configure()
@@ -59,13 +59,13 @@ class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
 
   // [START new_delegate]
   @available(iOS 9.0, *)
-  func application(_ application: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any])
+  func application(_ application: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any])
     -> Bool {
       // [END new_delegate]
       return self.application(application,
                               open: url,
                               // [START new_options]
-                              sourceApplication:options[UIApplicationOpenURLOptionsKey.sourceApplication] as? String,
+                              sourceApplication:options[UIApplication.OpenURLOptionsKey.sourceApplication] as? String,
                               annotation: [:])
   }
   // [END new_options]
@@ -89,7 +89,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
   }
   // [END old_options]
 
-  func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([Any]?) -> Void) -> Bool {
+  func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
     return userActivity.webpageURL.flatMap(handlePasswordlessSignIn)!
   }
 
@@ -100,7 +100,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
       // [END is_signin_link]
       UserDefaults.standard.set(link, forKey: "Link")
       (window?.rootViewController as? UINavigationController)?.popToRootViewController(animated: false)
-      window?.rootViewController?.childViewControllers[0].performSegue(withIdentifier: "passwordless", sender: nil)
+      window?.rootViewController?.children[0].performSegue(withIdentifier: "passwordless", sender: nil)
       return true
     }
     return false

authentication/AuthenticationExampleSwift/MainViewController.swift

@@ -432,15 +432,15 @@ class MainViewController: UITableViewController, GIDSignInUIDelegate {
     return "Unlink"
   }
 
-  override func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
+  override func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCell.EditingStyle {
     if indexPath.section == kSectionProviders {
       return .delete
     }
     return .none
   }
 
   // Swipe to delete
-  override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
+  override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
     if editingStyle == .delete {
       let providerID = Auth.auth().currentUser?.providerData[indexPath.row].providerID
       showSpinner({