App icon and launch screen in iOS Swift - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

What happens if the launch screen storyboard is missing?

In an iOS app, if the launch screen storyboard file is not set or missing, what will the user see when the app starts?

A A white screen until the app finishes loading

B The app's main interface immediately without any delay

C A black screen until the app finishes loading

D The app crashes on launch

💡 Hint

Think about the default background color shown by iOS when no launch screen is provided.

If the launch screen storyboard is missing, iOS shows a white screen by default while the app loads. It does not crash or show the main interface immediately.

🧠 Conceptual

intermediate

Why use an asset catalog for app icons?

Why is it recommended to use an asset catalog to manage app icons in an iOS project?

A Because asset catalogs automatically manage all required icon sizes and organize them efficiently

B Because asset catalogs allow you to write code to change icons dynamically

C Because asset catalogs reduce the app size by compressing icons at runtime

D Because asset catalogs are required to display icons only on iPads

💡 Hint

Think about how Xcode handles multiple icon sizes for different devices.

Asset catalogs help organize all icon sizes in one place and Xcode uses them to provide the correct icon for each device automatically.

📝 Syntax

advanced

Which Info.plist key sets the launch screen storyboard?

In the Info.plist file, which key correctly specifies the launch screen storyboard file name?

A "UIStoryboardLaunchName" with the storyboard file name as value

B "LaunchScreenFile" with the storyboard file name as value

C "CFBundleLaunchScreen" with the storyboard file name as value

D "UILaunchStoryboardName" with the storyboard file name as value

💡 Hint

Check the official Apple documentation for the exact key name.

The correct key to specify the launch screen storyboard in Info.plist is "UILaunchStoryboardName".

❓ lifecycle

advanced

When is the launch screen displayed during app startup?

At what point during the iOS app startup lifecycle is the launch screen shown to the user?

A After the app delegate's application(_:didFinishLaunchingWithOptions:) method completes

B Only after the first view controller is fully loaded

C While the app is loading and before the main interface is ready

D Before the app process starts running any code

💡 Hint

Think about what the launch screen is meant to mask.

The launch screen is displayed while the app is loading and before the main interface is ready, providing a smooth transition.

🔧 Debug

expert

Why does the app icon not update after adding new images?

You added new app icon images to the asset catalog and set them correctly, but the app icon on the device still shows the old icon. What is the most likely cause?

A The asset catalog was not included in the build target

B The app needs to be deleted and reinstalled to clear the icon cache

C The Info.plist does not reference the asset catalog for icons

D The device does not support the new icon sizes

💡 Hint

Think about how iOS caches app icons on devices.

iOS caches app icons, so after updating icons, deleting and reinstalling the app clears the cache and shows the new icon.