SwiftUI uses result builders

Introduction

Result builders help SwiftUI create views by combining small pieces of code into a bigger layout easily.

When you want to build a user interface by stacking views together.

When you want to write clean and readable code for UI layouts.

When you want to create custom view containers that combine multiple views.

When you want SwiftUI to understand how to group multiple views inside a closure.

Syntax

Swift

struct ContentView: View {
    var body: some View {
        VStack {
            Text("Hello")
            Text("World")
        }
    }
}

The curly braces after VStack use a result builder to combine views.

SwiftUI uses @ViewBuilder behind the scenes to build the view list.

Examples

This stacks two text views vertically.

Swift

VStack {
    Text("Line 1")
    Text("Line 2")
}

This stacks two text views horizontally.

Swift

HStack {
    Text("Left")
    Text("Right")
}

This groups views without changing layout but still uses result builder.

Swift

Group {
    Text("First")
    Text("Second")
}

Sample Program

This program shows two text lines stacked vertically using SwiftUI's result builder.

Swift

import SwiftUI

struct ContentView: View {
    var body: some View {
        VStack {
            Text("Hello")
            Text("SwiftUI")
        }
    }
}

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Important Notes

Result builders let you write multiple views inside braces without commas.

You can create your own result builders for custom DSLs (domain-specific languages).

Summary

SwiftUI uses result builders to combine multiple views inside closures.

This makes UI code clean and easy to read.

Common result builder in SwiftUI is @ViewBuilder.