This question belongs to View Building with SwiftUI , especially the domain covering positioning and/or layout a single SwiftUI View with standard Views and modifiers and the foundational structure of a SwiftUI view. In SwiftUI, a custom screen is typically declared as a struct that conforms to the View protocol. Apple’s SwiftUI documentation shows the standard pattern:

struct ScreenView: View {

var body: some View {

Text( " Hello " )

}

}

Here, struct is required because SwiftUI views are commonly defined as structures. View is required after the colon because the type must conform to the View protocol. body is the required computed property that returns the content of the view as some View. Apple documents that every conforming View type must provide a body property that describes its content.

So the completed code is:

import SwiftUI

struct ScreenView: View {

var body: some View {

Text( " Hello " )

}

}

This is the canonical SwiftUI view declaration pattern and is one of the most fundamental concepts in App Development with Swift.

This question falls under View Building with SwiftUI , specifically the domain covering multi-view apps with navigation stacks, links, and sheets . The first blank must be NavigationLink because SwiftUI uses a navigation link inside a NavigationStack to push or present a destination view as part of the navigation hierarchy. Apple’s documentation states that people tap or click a NavigationLink to present a view inside a NavigationStack or NavigationSplitView. That matches the first code section, where tapping " Show Blue View " should navigate to BlueView().

The second blank must be .sheet because the code uses isPresented: $showRedView, which is the standard SwiftUI sheet modifier for modal presentation controlled by a Boolean binding. Apple documents sheet(isPresented:onDismiss:content:) as the modifier to use when you want to present a modal view when a Boolean becomes true. Since the button toggles showRedView, SwiftUI presents RedView() modally as a sheet.

So the completed structure is effectively:

NavigationLink( " Show Blue View " ) {

BlueView()

}

sheet(isPresented: $showRedView) {

RedView()

}

This directly aligns with SwiftUI navigation and modal presentation patterns in the App Development with Swift objective domains.