SwiftUI Quiz - Languages Swift

Free practice quiz: SwiftUI (Languages Swift). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. In SwiftUI, what is the primary purpose of the `@State` property wrapper?

   1. To manage shared data across multiple views
   2. To hold immutable data that doesn't change
   3. To manage local, mutable state within a single view
   4. To observe changes in external data sources
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   Answer: C. To manage local, mutable state within a single view

   `@State` is used to declare a source of truth for data that is local to a specific view and can be modified by that view. When the state changes, SwiftUI automatically re-renders the view.

2. How can you create a horizontal stack of views in SwiftUI?

   1. Using `VStack`
   2. Using `ZStack`
   3. Using `HStack`
   4. Using `ForEach`
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   Answer: C. Using `HStack`

   `HStack` is a container view that arranges its child views in a horizontal line.

3. Which modifier is used to define a custom transition when a view appears or disappears?

   1. .animation()
   2. .transition()
   3. .effect()
   4. .animationCurve()
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   Answer: B. .transition()

   The `.transition()` modifier allows you to specify custom animations for when a view is added to or removed from the view hierarchy. Examples include `.slide`, `.opacity`, or `.scale`.

4. Which of these is NOT a built-in layout container in SwiftUI?

   1. VStack
   2. HStack
   3. Grid
   4. ZStack
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   Answer: C. Grid

   While SwiftUI has introduced `Grid` and `LazyVGrid`/`LazyHGrid` for more complex grid layouts, `VStack`, `HStack`, and `ZStack` are the fundamental linear and overlay layout containers.

5. How do you present a navigation link in SwiftUI?

   1. Using the `.present()` modifier
   2. Using `NavigationLink(destination:label:)`
   3. Using the `.push()` modifier
   4. Using the `.sheet()` modifier
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   Answer: B. Using `NavigationLink(destination:label:)`

   `NavigationLink` is the primary SwiftUI view for creating navigation destinations. It wraps a label (like a `Text` or `Button`) and a destination view that is pushed onto the `NavigationView` stack when the label is tapped.

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