handle=Auth.auth().addStateDidChangeListener{auth,userin// Get the user's email addressletemail=user.email// or get their phone numberletphoneNumber=user.phoneNumber// ...}
Objective-C
self.handle=[[FIRAuthauth]addAuthStateDidChangeListener:^(FIRAuth*_Nonnullauth,FIRUser*_Nullableuser){// Get the user's email addressNSString*email=user.email;// or get their phone numberNSString*phoneNumber=user.phoneNumber;// ...}];
Unity
Firebase.Auth.FirebaseAuthauth;Firebase.Auth.FirebaseUseruser;// Handle initialization of the necessary firebase modules:voidInitializeFirebase(){auth=Firebase.Auth.FirebaseAuth.DefaultInstance;auth.StateChanged+=AuthStateChanged;AuthStateChanged(this,null);}// Track state changes of the auth object.voidAuthStateChanged(objectsender,System.EventArgseventArgs){if(auth.CurrentUser!=user){boolsignedIn=user!=auth.CurrentUser&&auth.CurrentUser!=null;user=auth.CurrentUser;if(signedIn){// Get the user's email addressstringemail=user.Email;// or get their phone numberstringphoneNumber=user.PhoneNumber;// ...}}}// Handle removing subscription and reference to the Auth instance.// Automatically called by a Monobehaviour after Destroy is called on it.voidOnDestroy(){auth.StateChanged-=AuthStateChanged;auth=null;}
[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["没有我需要的信息","missingTheInformationINeed","thumb-down"],["太复杂/步骤太多","tooComplicatedTooManySteps","thumb-down"],["内容需要更新","outOfDate","thumb-down"],["翻译问题","translationIssue","thumb-down"],["示例/代码问题","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC):2025-07-25。"],[],[],null,["Step 1: Implement a sign-in experience\n\n\u003cbr /\u003e\n\n|----------------------------------------------------------------------------------------------------------------------------------|\n| Introduction: [Measure iOS Ads conversions](/docs/tutorials/ads-ios-on-device-measurement/index-first-party) |\n| **Step 1: Implement a sign-in experience** \u003cbr /\u003e |\n| Step 2: [Integrate Google Analytics](/docs/tutorials/ads-ios-on-device-measurement/step-2) |\n| Step 3: [Initiate on-device conversion measurement using Google Analytics](/docs/tutorials/ads-ios-on-device-measurement/step-3) |\n| Step 4: [Troubleshoot and handle common issues](/docs/tutorials/ads-ios-on-device-measurement/step-4) |\n\n\u003cbr /\u003e\n\nThe first step is to implement a sign-in experience to allow users to provide\ntheir email addresses or phone number.\n\n**The authentication system that you use must provide an email address or\nphone number associated with the user.** The following steps outline the process\nfor securely collecting sign-in information using Firebase Authentication, but you\ncan skip this step if you already have an authentication system that collects\nuser emails or phone numbers and continue to [Step 2: Integrate Google Analytics](/docs/tutorials/ads-ios-on-device-measurement/step-2).\n\n\u003cbr /\u003e\n\n**Make sure you have the prerequisites for this tutorial**\n\n\u003cbr /\u003e\n\n- Your own app that can run on iOS 12 or higher\n\n- Your app registered as a Firebase App that's linked to Google Analytics\n and Ads\n\n- Your preferred IDE\n\n \u003cbr /\u003e\n\n\u003cbr /\u003e\n\nSet up an authentication system\n\nUse a Firebase Authentication sign-in method\n\nYou can use Firebase Authentication to allow users to sign in to your app using one or\nmore sign-in methods, including email address, phone number, password sign-in,\nand federated identity providers (like Google, Facebook or Twitter).\nPlease review [Get started with Firebase Authentication](/docs/auth/ios/start).\n\nIntegrate Firebase Authentication with a custom authentication system\n\nAlternatively, you can integrate Firebase Authentication with a custom\nauthentication system by modifying your authentication server to produce custom\nsigned tokens when a user successfully signs in. Your app receives this token\nand uses it to authenticate with Firebase. Please review [Get started with a custom\nauthentication system](/docs/auth/ios/custom-auth).\n\nGet the authenticated user's email address or phone number\n\nAfter you've set up an authentication system with Firebase Authentication, you can\nget the currently signed-in user.\n\nThe recommended way to get the current user is by setting a listener on the\n`Auth` object: \n\nSwift \n\n```swift\nhandle = Auth.auth().addStateDidChangeListener { auth, user in\n // Get the user's email address\n let email = user.email\n // or get their phone number\n let phoneNumber = user.phoneNumber\n // ...\n}\n```\n\nObjective-C \n\n```objective-c\nself.handle = [[FIRAuth auth]\n addAuthStateDidChangeListener:^(FIRAuth *_Nonnull auth, FIRUser *_Nullable user) {\n // Get the user's email address\n NSString *email = user.email;\n // or get their phone number\n NSString *phoneNumber = user.phoneNumber;\n // ...\n }];\n```\n\nUnity \n\n```c#\nFirebase.Auth.FirebaseAuth auth;\nFirebase.Auth.FirebaseUser user;\n\n// Handle initialization of the necessary firebase modules:\nvoid InitializeFirebase() {\n auth = Firebase.Auth.FirebaseAuth.DefaultInstance;\n auth.StateChanged += AuthStateChanged;\n AuthStateChanged(this, null);\n}\n\n// Track state changes of the auth object.\nvoid AuthStateChanged(object sender, System.EventArgs eventArgs) {\n if (auth.CurrentUser != user) {\n bool signedIn = user != auth.CurrentUser && auth.CurrentUser != null;\n user = auth.CurrentUser;\n if (signedIn) {\n // Get the user's email address\n string email = user.Email;\n // or get their phone number\n string phoneNumber = user.PhoneNumber;\n // ...\n }\n }\n}\n\n// Handle removing subscription and reference to the Auth instance.\n// Automatically called by a Monobehaviour after Destroy is called on it.\nvoid OnDestroy() {\n auth.StateChanged -= AuthStateChanged;\n auth = null;\n}\n```\n| **Note:** Find more code examples demonstrating Firebase Authentication in the [Firebase quickstarts](https://github.com/firebase/quickstart-ios).\n\n\u003cbr /\u003e\n\n*** ** * ** ***\n\n\u003cbr /\u003e\n\n[arrow_back_ios**Introduction**](/docs/tutorials/ads-ios-on-device-measurement/index-first-party)\n[**Step 2** : Integrate Google Analyticsarrow_forward_ios](/docs/tutorials/ads-ios-on-device-measurement/step-2)\n\n\u003cbr /\u003e\n\n*** ** * ** ***"]]