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# NavigationSplitViewStyle

A type that specifies the appearance and interaction of navigation split
views within a view hierarchy.

```
@MainActor @preconcurrency protocol NavigationSplitViewStyle
```

## Overview

To configure the navigation split view style for a view hierarchy, use the
[`navigationSplitViewStyle(_:)`](/documentation/SwiftUI/View/navigationSplitViewStyle(_:)) modifier.

A type conforming to this protocol inherits `@preconcurrency @MainActor`
isolation from the protocol if the conformance is included in the type’s
base declaration:

```
struct MyCustomType: Transition {
    // `@preconcurrency @MainActor` isolation by default
}
```

Isolation to the main actor is the default, but it’s not required. Declare
the conformance in an extension to opt out of main actor isolation:

```
extension MyCustomType: Transition {
    // `nonisolated` by default
}
```

## Topics

### Creating built-in styles

[`automatic`](/documentation/SwiftUI/NavigationSplitViewStyle/automatic)

A navigation split style that resolves its appearance automatically
based on the current context.

[`balanced`](/documentation/SwiftUI/NavigationSplitViewStyle/balanced)

A navigation split style that reduces the size of the detail content
to make room when showing the leading column or columns.

[`prominentDetail`](/documentation/SwiftUI/NavigationSplitViewStyle/prominentDetail)

A navigation split style that attempts to maintain the size of the
detail content when hiding or showing the leading columns.

### Creating custom styles

[`makeBody(configuration:)`](/documentation/SwiftUI/NavigationSplitViewStyle/makeBody(configuration:))

Creates a view that represents the body of a navigation split view.

[`NavigationSplitViewStyle.Configuration`](/documentation/SwiftUI/NavigationSplitViewStyle/Configuration)

The properties of a navigation split view instance.

[`Body`](/documentation/SwiftUI/NavigationSplitViewStyle/Body)

A view that represents the body of a navigation split view.

### Supporting types

[`AutomaticNavigationSplitViewStyle`](/documentation/SwiftUI/AutomaticNavigationSplitViewStyle)

A navigation split style that resolves its appearance automatically
based on the current context.

[`BalancedNavigationSplitViewStyle`](/documentation/SwiftUI/BalancedNavigationSplitViewStyle)

A navigation split style that reduces the size of the detail content
to make room when showing the leading column or columns.

[`ProminentDetailNavigationSplitViewStyle`](/documentation/SwiftUI/ProminentDetailNavigationSplitViewStyle)

A navigation split style that attempts to maintain the size of the
detail content when hiding or showing the leading columns.

[`NavigationSplitViewStyleConfiguration`](/documentation/SwiftUI/NavigationSplitViewStyleConfiguration)

The properties of a navigation split view instance.


---

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