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# arrangesAllSubviews

A Boolean value that determines whether the split view arranges all of its subviews as split panes.

```
var arrangesAllSubviews: Bool { get set }
```

## Discussion

If the value of this property is <doc://com.apple.documentation/documentation/Swift/true>, the split view arranges all of its subviews automatically. The [`arrangedSubviews`](/documentation/AppKit/NSSplitView/arrangedSubviews) array is identical to the split view’s [`subviews`](/documentation/AppKit/NSView/subviews) array, so any change to [`subviews`](/documentation/AppKit/NSView/subviews) reflects in the [`arrangedSubviews`](/documentation/AppKit/NSSplitView/arrangedSubviews) array. The default value of this property is <doc://com.apple.documentation/documentation/Swift/true>.

If the value of this property is <doc://com.apple.documentation/documentation/Swift/false>, you must explicitly add a view as an arranged subview to arrange it as a split pane. You add an arranged subview using [`addArrangedSubview(_:)`](/documentation/AppKit/NSSplitView/addArrangedSubview(_:)).

When you change the value of this property from <doc://com.apple.documentation/documentation/Swift/true> to <doc://com.apple.documentation/documentation/Swift/false>, all existing subviews stay as arranged subviews in [`arrangedSubviews`](/documentation/AppKit/NSSplitView/arrangedSubviews). When you change the value of this property from <doc://com.apple.documentation/documentation/Swift/false> to <doc://com.apple.documentation/documentation/Swift/true>, all existing subviews become arranged subviews, and the value of the [`subviews`](/documentation/AppKit/NSView/subviews) array becomes the [`arrangedSubviews`](/documentation/AppKit/NSSplitView/arrangedSubviews) array.

---

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