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# NSStackView.VisibilityPriority

The various Auto Layout priorities for a view in the stack view to remain attached.

```
struct VisibilityPriority
```

## Discussion

For an explanation of how visibility priority interacts with clipping resistance to determine the detachment behavior of a stack view’s views, see the discussions for the [`setClippingResistancePriority(_:for:)`](/documentation/AppKit/NSStackView/setClippingResistancePriority(_:for:)) and [`setVisibilityPriority(_:for:)`](/documentation/AppKit/NSStackView/setVisibilityPriority(_:for:)) methods.

A view in a detached state is not present in the stack view’s view hierarchy, but it still consumes memory.

## Topics

### Initializers

[`init(_:)`](/documentation/AppKit/NSStackView/VisibilityPriority/init(_:))

[`init(rawValue:)`](/documentation/AppKit/NSStackView/VisibilityPriority/init(rawValue:))

### Priorities

[`mustHold`](/documentation/AppKit/NSStackView/VisibilityPriority/mustHold)

The default value, and maximum Auto Layout priority, that results in a view never detaching from the stack view.

[`detachOnlyIfNecessary`](/documentation/AppKit/NSStackView/VisibilityPriority/detachOnlyIfNecessary)

The Auto Layout priority that results in detachment of a view when there is insufficient space in the stack view to display it fully.

[`notVisible`](/documentation/AppKit/NSStackView/VisibilityPriority/notVisible)

The minimum Auto Layout priority that forces a view to detach from the stack view.


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