App Store submission in Flutter - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the first step to prepare your Flutter app for App Store submission?

Before submitting your Flutter app to the App Store, what is the very first step you should take?

A Create an Apple Developer account and enroll in the Apple Developer Program.

B Upload your app directly to the App Store without any preparation.

C Publish your app on Google Play Store first.

D Write unit tests for your Flutter app.

💡 Hint

Think about what Apple requires before you can submit any app.

You must have an Apple Developer account enrolled in the Apple Developer Program to submit apps to the App Store.

❓ ui_behavior

intermediate

What happens if your app's Info.plist lacks the NSCameraUsageDescription key?

Your Flutter app uses the camera, but the Info.plist file does not include the NSCameraUsageDescription key. What will happen when the app runs on a real iOS device?

A The app will show a default system message explaining camera use.

B The app will access the camera without any warning to the user.

C The app will crash when trying to access the camera.

D The app will ignore camera access and continue running.

💡 Hint

iOS requires permission messages for privacy-sensitive features.

Without NSCameraUsageDescription, iOS will crash the app when it tries to access the camera because it lacks a privacy usage description.

❓ lifecycle

advanced

When should you increment the build number in your Flutter iOS app before submission?

You are preparing a new version of your Flutter app for App Store submission. When is the correct time to increment the build number in Xcode?

A Only after the app has been approved by Apple.

B After uploading the app to App Store Connect.

C It is not necessary to increment the build number.

D Before archiving the app for submission to App Store Connect.

💡 Hint

Think about what uniquely identifies each app upload.

The build number must be incremented before archiving and uploading the app to App Store Connect to distinguish versions.

❓ navigation

advanced

Which tool do you use to upload your Flutter iOS app archive to App Store Connect?

After building your Flutter app for iOS and creating an archive in Xcode, which tool should you use to upload the app to App Store Connect?

A Flutter CLI command flutter upload.

B Xcode Organizer's Upload to App Store feature.

C Android Studio's Publish feature.

D Directly copying the archive to the App Store folder.

💡 Hint

Think about the official Apple tools for app submission.

Xcode Organizer provides a built-in feature to upload your app archive directly to App Store Connect.

📝 Syntax

expert

What is the correct way to specify the app version and build number in Flutter's pubspec.yaml for iOS submission?

In your Flutter project's pubspec.yaml, how should you write the version field to set app version 2.3.1 and build number 45 for iOS submission?

Flutter

version: ?

A 2.3.1+45

B 2.3.1-45

C 2.3.1.45

D version: 2.3.1+45

💡 Hint

The format is version+buildnumber without extra keys.

Flutter uses the format 'x.y.z+build' in pubspec.yaml to set version and build number for iOS and Android.

Practice

1. What is the primary tool used to upload a Flutter app to the Apple App Store?

easy

A. Xcode

B. Android Studio

C. Visual Studio Code

D. Firebase Console

Solution

1. Step 1: Identify the platform for iOS app submission

   Apple requires apps to be uploaded using Xcode or Application Loader, both part of Xcode tools.

2. Step 2: Recognize Flutter's role

   Flutter builds the app, but Xcode is needed to upload it to the App Store.

3. Final Answer:

   Xcode -> Option A

4. Quick Check:

   Upload tool for iOS = Xcode [OK]

Hint: Remember: iOS apps upload via Xcode, not Android tools [OK]

Common Mistakes:

• Confusing Android Studio with Xcode
• Thinking Flutter uploads directly
• Using Firebase Console for iOS upload

2. Which of the following is the correct command to build an iOS release app in Flutter before submission?

easy

A. flutter build apk --release

B. flutter build ios --release

C. flutter run ios

D. flutter build ios

Solution

1. Step 1: Understand Flutter build commands

   To build an iOS app for release, the command is flutter build ios --release.

2. Step 2: Eliminate incorrect options

   flutter build apk is for Android, flutter run ios runs debug, and flutter build ios defaults to debug mode without --release.

3. Final Answer:

   flutter build ios --release -> Option B

4. Quick Check:

   iOS release build = flutter build ios --release [OK]

Hint: Use --release flag to build production iOS app [OK]

Common Mistakes:

• Using apk build for iOS
• Omitting --release flag
• Using flutter run instead of build

3. Consider this Flutter command output snippet after running flutter build ios --release:

Built ios/Runner.app (archived) to build/ios/iphoneos/Runner.app

What does this output indicate?

medium

A. The app was built successfully and is ready for Xcode upload

B. The build failed due to missing Runner.app

C. The app is built but only for Android devices

D. The command only runs the app on a simulator

Solution

1. Step 1: Interpret the build output message

   The message shows the app was built and archived at the specified path.

2. Step 2: Understand the context of iOS build

   Since it mentions ios/Runner.app and iphoneos, it means the app is built for real iOS devices, ready for upload.

3. Final Answer:

   The app was built successfully and is ready for Xcode upload -> Option A

4. Quick Check:

   Build output shows success = The app was built successfully and is ready for Xcode upload [OK]

Hint: Look for 'archived' and path to confirm successful build [OK]

Common Mistakes:

• Confusing build success with failure
• Thinking it's Android build
• Assuming it runs on simulator only

4. You tried submitting your Flutter app to the App Store but got a rejection due to missing app icons. What is the most likely cause?

medium

A. You used the wrong Flutter channel

B. You did not run flutter build apk

C. You forgot to add app icons in the iOS asset catalog

D. You did not enable internet permission in Info.plist

Solution

1. Step 1: Identify the cause of missing app icons

   App Store requires app icons in the iOS asset catalog; missing icons cause rejection.

2. Step 2: Eliminate unrelated options

   flutter build apk is for Android, Flutter channel does not affect icons, and internet permission is unrelated to icons.

3. Final Answer:

   You forgot to add app icons in the iOS asset catalog -> Option C

4. Quick Check:

   Missing icons = forgot iOS asset catalog icons [OK]

Hint: Always add app icons in Xcode asset catalog before submission [OK]

Common Mistakes:

• Confusing Android build commands
• Ignoring asset catalog setup
• Assuming permissions cause icon issues

5. You want to submit your Flutter app to the App Store but receive an error about the app's bundle identifier not matching your App Store Connect record. What should you do to fix this?

hard

A. Change the app name in pubspec.yaml to match the App Store Connect record

B. Delete and recreate your Apple developer account

C. Rebuild the app using flutter build apk

D. Update the bundle identifier in Xcode to match the App Store Connect record

Solution

1. Step 1: Understand bundle identifier importance

   The bundle identifier uniquely identifies your app and must match exactly between Xcode and App Store Connect.

2. Step 2: Fix the mismatch

   Update the bundle identifier in Xcode project settings to match the App Store Connect record.

3. Step 3: Ignore unrelated fixes

   Changing app name or rebuilding Android APK won't fix bundle ID issues; deleting account is extreme and unnecessary.

4. Final Answer:

   Update the bundle identifier in Xcode to match the App Store Connect record -> Option D

5. Quick Check:

   Bundle ID mismatch = fix in Xcode [OK]

Hint: Bundle ID must match App Store Connect exactly [OK]

Common Mistakes:

• Changing app name instead of bundle ID
• Rebuilding Android app
• Deleting developer account unnecessarily