SwiftUI views, modifiers, State, Binding, Observable, lists, navigation, layout stacks and the view lifecycle.
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- What does the View protocol represent in SwiftUI?
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A protocol that defines a single visual element or component that can be rendered on screen.- How do you apply a modifier to a SwiftUI view?
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Call a modifier method on the view using dot notation, e.g., Text('Hello').padding()- What is the @State property wrapper used for?
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To declare a local state variable in a SwiftUI view that triggers a re-render when its value changes.- What is a VStack?
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A view that arranges child views in a vertical line from top to bottom.- What does the Text view do?
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Displays a string of text on the screen.- What is the @Binding property wrapper?
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A property wrapper that creates a two-way connection to a state variable from a parent view, allowing child views to read and modify it.- Why does modifier order matter in SwiftUI?
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Modifiers are applied sequentially, and each modifier returns a new view, so the order affects the final visual result.- What is an HStack?
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A view that arranges child views in a horizontal line from left to right.- What does the padding modifier do?
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Adds space around a view on all sides or on specific edges.- What is the purpose of the @StateObject property wrapper?
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To manage a reference type (Observable object) as local state in a view, creating a new instance once and persisting it across re-renders.- What is a ZStack?
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A view that overlays child views on top of each other, arranged front to back along the z-axis.- What does the Observable macro do?
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Marks a class as observable so that SwiftUI automatically tracks changes to its properties and re-renders dependent views.- What is a Spacer view?
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A flexible view that expands to fill available space in its parent view.- What does the @Published property wrapper do?
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Marks a property in an Observable class so that changes to it are automatically broadcast to dependent views.- What is NavigationStack used for?
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To manage navigation between multiple views by maintaining a stack of views and their navigation state.
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