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iOS Swiftmobile~20 mins

Why Firebase provides mobile backend services in iOS Swift - Challenge Your Understanding

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LearnWhyDeepUITryChallengeBuildRecallPublish
Challenge - 5 Problems
🎖️
Firebase Mobile Backend Master
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Test your skills under time pressure!
🧠 Conceptual
intermediate
2:00remaining
Why use Firebase for mobile backend?
Which of the following is the main reason Firebase provides backend services for mobile apps?
ATo increase app size by adding unnecessary libraries
BTo force developers to write server code manually
CTo let developers focus on app features without managing servers
DTo make apps run only on desktop computers
Attempts:
2 left
💡 Hint
Think about what backend services do for app developers.
❓ ui_behavior
intermediate
2:00remaining
Firebase Authentication effect on app UI
What happens in the app UI when Firebase Authentication successfully signs in a user?
AThe app logs out the user automatically
BThe app crashes immediately
CThe app shows a blank white screen
DThe app navigates to the main screen showing user data
Attempts:
2 left
💡 Hint
Think about what a successful login usually triggers in an app.
❓ lifecycle
advanced
2:00remaining
Firebase Realtime Database data sync behavior
When using Firebase Realtime Database in a mobile app, what happens if the device goes offline and then comes back online?
AData changes made offline sync automatically when back online
BAll data is lost and must be re-entered manually
CThe app crashes due to lost connection
DThe app deletes local data and fetches empty data from server
Attempts:
2 left
💡 Hint
Consider how Firebase handles offline data.
❓ navigation
advanced
2:00remaining
Firebase Cloud Messaging triggers navigation
How can Firebase Cloud Messaging (FCM) be used to navigate users to a specific screen in a mobile app?
ABy sending a notification with data payload that the app reads to navigate
BBy deleting the app and reinstalling it remotely
CBy forcing the app to restart without user interaction
DBy disabling all navigation controls in the app
Attempts:
2 left
💡 Hint
Think about how notifications can carry information.
📝 Syntax
expert
2:00remaining
Correct Swift code to initialize Firebase in AppDelegate
Which Swift code snippet correctly initializes Firebase in the AppDelegate's application(_:didFinishLaunchingWithOptions:) method?
iOS Swift
import UIKit
import Firebase

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Initialize Firebase here
    FirebaseApp.configure()
    return true
  }
}
AFirebase.startApp()
BFirebaseApp.configure()
CFirebaseApp.start()
DFirebase.configureApp()
Attempts:
2 left
💡 Hint
Check Firebase official docs for initialization method name.