Analytics and Crashlytics in iOS Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

What happens when you log an event with Firebase Analytics in Swift?

Consider this Swift code snippet that logs a custom event using Firebase Analytics. What is the expected behavior after this code runs?

iOS Swift

import FirebaseAnalytics

Analytics.logEvent("purchase", parameters: ["item_id": "sku123", "price": 9.99])

A The event "purchase" with parameters is sent to Firebase Analytics and appears in the Firebase console dashboard.

B The app crashes because the logEvent method requires a completion handler.

C Nothing happens because you must call Analytics.start() before logging events.

D The event is logged locally but never sent to Firebase servers.

💡 Hint

Think about how Firebase Analytics handles event logging and reporting.

Calling Analytics.logEvent sends the event data asynchronously to Firebase Analytics. The event will appear in the Firebase console after some processing time.

❓ lifecycle

intermediate

When should you initialize Firebase Crashlytics in an iOS app?

You want to capture crashes in your iOS app using Firebase Crashlytics. At which point in the app lifecycle should you initialize Crashlytics to ensure it captures all crashes?

A After the user logs in successfully.

B In the viewDidLoad() method of the first view controller.

C Right before the app enters the background state.

D In the AppDelegate's application(_:didFinishLaunchingWithOptions:) method before returning true.

💡 Hint

Crashlytics needs to be ready as early as possible to catch startup crashes.

Initializing Crashlytics in application(_:didFinishLaunchingWithOptions:) ensures it starts monitoring crashes from app launch onward.

🔧 Debug

advanced

Why does this Crashlytics custom key not appear in the Firebase console?

You added this code to set a custom key in Crashlytics, but the key-value pair does not show up in the Firebase Crashlytics dashboard. What is the most likely reason?

iOS Swift

import FirebaseCrashlytics

Crashlytics.crashlytics().setCustomValue("premium", forKey: "user_type")

A The method setCustomValue is deprecated and does not work anymore.

B The app has not crashed after setting the custom key, so Crashlytics has not sent the data yet.

C You must call Crashlytics.crashlytics().send() manually to upload keys.

D Custom keys only appear if you set them before FirebaseApp.configure() is called.

💡 Hint

Think about when Crashlytics uploads crash reports and associated data.

Crashlytics uploads custom keys only when a crash occurs. Without a crash, the keys are not sent or visible in the dashboard.

🧠 Conceptual

advanced

How does Firebase Analytics handle user privacy and data collection on iOS?

Which statement correctly describes Firebase Analytics behavior regarding user privacy on iOS devices?

A Firebase Analytics ignores user privacy settings and always collects device identifiers.

B You must manually disable Firebase Analytics if the user opts out of tracking; it does not handle this automatically.

C Firebase Analytics automatically respects the iOS App Tracking Transparency (ATT) framework and disables IDFA collection if the user denies permission.

D Firebase Analytics only collects data when the app is in the foreground.

💡 Hint

Consider Apple's privacy rules and how Firebase integrates with them.

Firebase Analytics integrates with iOS privacy frameworks and respects user consent for tracking, disabling IDFA collection if permission is denied.

❓ navigation

expert

What is the effect of calling Crashlytics.crashlytics().crash() in your app?

You add the following line in your app code during testing. What happens when this line executes?

iOS Swift

Crashlytics.crashlytics().crash()

A The app immediately crashes, generating a crash report sent to Firebase Crashlytics on next launch.

B The app logs a non-fatal error but continues running without interruption.

C The app throws a runtime exception that can be caught by a try-catch block.

D Nothing happens because this method is only a placeholder and does not cause a crash.

💡 Hint

This method is used to test Crashlytics crash reporting.

Calling crash() forces the app to crash immediately, which helps test Crashlytics crash reporting functionality.