HStack

Expo UI HStack matches the official SwiftUI HStack API and arranges its children horizontally.

Usage

Basic horizontal stack

import { Host, HStack, Text } from '@expo/ui/swift-ui';

export default function BasicHStackExample() {
  return (
    <Host style={{ flex: 1 }}>
      <HStack spacing={12}>
        <Text>First</Text>
        <Text>Second</Text>
        <Text>Third</Text>
      </HStack>
    </Host>
  );
}

First, Second, and Third text items arranged horizontally in an HStack

With alignment

The alignment prop controls vertical alignment of children. Available options are: top, center, bottom, firstTextBaseline, and lastTextBaseline.

import { Host, HStack, Rectangle } from '@expo/ui/swift-ui';
import { frame } from '@expo/ui/swift-ui/modifiers';

export default function HStackAlignmentExample() {
  return (
    <Host style={{ flex: 1 }}>
      <HStack spacing={12} alignment="top">
        <Rectangle modifiers={[frame({ width: 50, height: 50 })]} />
        <Rectangle
          modifiers={[frame({ width: 50, height: 100 })]}
        />
        <Rectangle modifiers={[frame({ width: 50, height: 75 })]} />
      </HStack>
    </Host>
  );
}

Three rectangles of different heights aligned to the top edge in an HStack

API

import { HStack } from '@expo/ui/swift-ui';

Component

`HStack`

Type: React.Element<HStackProps>

HStackProps

`alignment`

Optional • Literal type: string

The vertical alignment of children within the stack.

Acceptable values are: 'center' | 'top' | 'bottom' | 'firstTextBaseline' | 'lastTextBaseline'

`children`

Type: ReactNode

`spacing`

Optional • Type: number

The spacing between children.

Inherited props

CommonViewModifierProps

Modifiers

Use these modifiers in the modifiers prop of the SwiftUI and Universal version.

Expo UI lets you put any of the 89 modifiers for any view on HStack, but not all of them do something here.

75 change what you see on HStack.
2 work, but not in the way that you may expect.
1 have no visible effect on HStack.
13 work only in one place, such as a widget or a Grid.

Best modifiers for HStack

These modifiers are made for HStack, or they are the ones that you use most with it.

Also works on HStack

HStack takes these modifiers too, and each one works in the usual way.

Needs care on HStack

These modifiers work on HStack, but not in the way that you may expect.

Modifier	What to know
`onLongPressGesture`	Touches on the empty space between children are not detected. Add `contentShape('rectangle')` before this modifier.
`onTapGesture`	Touches on the empty space between children are not detected. Add `contentShape('rectangle')` before this modifier.

No visible effect on HStack

HStack accepts these modifiers, but you see no change. They do not give an error.

Modifier	Why nothing happens
`zIndex`	It changes the order of views that cover each other in the same parent, and HStack does not stack its children.

Only in some places

These modifiers work only in a widget, in a Grid, in a Namespace or in a parent that asks for them.

Modifier	Where it works
`activityBackgroundTint`	Works only in a Live Activity. It has no effect in the app.
`alignmentGuide`	Has an effect only when the parent, such as a `VStack` or `ZStack`, aligns its children by the same guide.
`containerBackground`	Works only in a widget, or in a navigation container when you use a `navigation` placement.
`glassEffectId`	Works only on a view that also has `glassEffect`, in a `GlassEffectContainer` and a `Namespace`.
`gridCellAnchor` iOS 16+	Works only on a cell of a `Grid`. `Grid` is in `@expo/ui/swift-ui`, but it has no Expo docs page.
`gridCellColumns`	Works only on a view in a `Grid.Row`. `Grid` is in `@expo/ui/swift-ui`, but it has no Expo docs page.
`gridCellUnsizedAxes`	Works only on a view in a `Grid`. `Grid` is in `@expo/ui/swift-ui`, but it has no Expo docs page.
`gridColumnAlignment` iOS 16+	Works only on a view in a `Grid.Row`. `Grid` is in `@expo/ui/swift-ui`, but it has no Expo docs page.
`invalidatableContent` iOS 17+	Has an effect only when a parent view uses `redacted` with the `invalidated` reason.
`matchedGeometryEffect`	Works only in a `Namespace`. Give two views the same `id` and change between them with an animation.
`privacySensitive`	Has an effect only when a parent view uses `redacted` with the `privacy` reason.
`unredacted`	Has an effect only in a parent view that uses `redacted`.
`widgetURL`	Works only in a widget. It has no effect in the app.

Sources

The original Expo docs for this page:

HStack (SwiftUI) (source-of-truth/versions/v57.0.0/sdk/ui/swift-ui/hstack.md)
HStack (Universal) (source-of-truth/versions/v57.0.0/sdk/ui/universal/row.md)

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