Update the sample app to use the new FCM registration API.

messaging/MessagingExample.xcodeproj/project.pbxproj

@@ -733,7 +733,7 @@
 			repositoryURL = "https://github.com/firebase/firebase-ios-sdk";
 			requirement = {
 				kind = upToNextMajorVersion;
-				minimumVersion = 11.7.0;
+				minimumVersion = 12.18.0;
 			};
 		};
 /* End XCRemoteSwiftPackageReference section */

messaging/MessagingExample/AppDelegate.swift

@@ -164,4 +164,21 @@ extension AppDelegate: MessagingDelegate {
   }
 
   // [END refresh_token]
+
+  func messaging(_ messaging: Messaging, didReceiveRegistration installationId: String?) {
+    print("FCM registration: \(String(describing: installationId))")
+
+    let dataDict: [String: String] = ["token": installationId ?? ""]
+    NotificationCenter.default.post(
+      name: Notification.Name("FCMToken"),
+      object: nil,
+      userInfo: dataDict
+    )
+    // TODO: If necessary send installation ID to application server.
+    // Note: This callback is fired at each app startup and whenever a new registration is generated.
+  }
+
+  func messaging(_ messaging: Messaging, didUnregister installationId: String) {
+    print("Did unregister FCM registration: \(installationId)")
+  }
 }

messaging/MessagingExample/Info.plist

@@ -24,6 +24,8 @@
 	<string>????</string>
 	<key>CFBundleVersion</key>
 	<string>1</string>
+	<key>FirebaseMessagingInstallationIdEnabled</key>
+	<true/>
 	<key>LSApplicationCategoryType</key>
 	<string></string>
 	<key>LSRequiresIPhoneOS</key>

messaging/MessagingExample/ViewController.swift

@@ -32,22 +32,35 @@ class ViewController: UIViewController {
   }
 
   @IBAction func handleLogTokenTouch(_ sender: UIButton) {
-    // [START log_fcm_reg_token]
-    let token = Messaging.messaging().fcmToken
-    print("FCM token: \(token ?? "")")
-    // [END log_fcm_reg_token]
-    fcmTokenMessage.text = "Logged FCM token: \(token ?? "")"
+    if Messaging.messaging().isInstallationIdEnabled {
+      Messaging.messaging().register { [weak self] error in
+        guard let self = self else { return }
+        if let error = error {
+          print("Error registering FCM: \(error)")
+          self.remoteFCMTokenMessage.text = "Error registering: \(error.localizedDescription)"
+        } else {
+          print("Successfully registered with FCM")
+          self.remoteFCMTokenMessage.text = "Successfully registered with FCM."
+        }
+      }
+    } else {
+      // [START log_fcm_reg_token]
+      let token = Messaging.messaging().fcmToken
+      print("FCM token: \(token ?? "")")
+      // [END log_fcm_reg_token]
+      fcmTokenMessage.text = "Logged FCM token: \(token ?? "")"
 
-    // [START log_iid_reg_token]
-    Messaging.messaging().token { token, error in
-      if let error = error {
-        print("Error fetching remote FCM registration token: \(error)")
-      } else if let token = token {
-        print("Remote instance ID token: \(token)")
-        self.remoteFCMTokenMessage.text = "Remote FCM registration token: \(token)"
+      // [START log_iid_reg_token]
+      Messaging.messaging().token { token, error in
+        if let error = error {
+          print("Error fetching remote FCM registration token: \(error)")
+        } else if let token = token {
+          print("Remote instance ID token: \(token)")
+          self.remoteFCMTokenMessage.text = "Remote FCM registration token: \(token)"
+        }
       }
+      // [END log_iid_reg_token]
     }
-    // [END log_iid_reg_token]
   }
 
   @IBAction func handleSubscribeTouch(_ sender: UIButton) {
@@ -61,7 +74,7 @@ class ViewController: UIViewController {
   @objc func displayFCMToken(notification: NSNotification) {
     guard let userInfo = notification.userInfo else { return }
     if let fcmToken = userInfo["token"] as? String {
-      fcmTokenMessage.text = "Received FCM token: \(fcmToken)"
+      fcmTokenMessage.text = "Received FCM registration: \(fcmToken)"
     }
   }
 }