<!--
{
  "availability" : [
    "macOS: 10.10.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AppKit",
  "identifier" : "/documentation/AppKit/NSPopover/appearance-swift.property",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "AppKit"
    ],
    "preciseIdentifier" : "c:objc(cs)NSPopover(py)appearance"
  },
  "title" : "appearance"
}
-->

# appearance

The appearance of the popover.

```
var appearance: NSAppearance? { get set }
```

## Discussion

If no appearance is specified, the popover’s effective appearance defaults to [`vibrantLight`](/documentation/AppKit/NSAppearance/Name-swift.struct/vibrantLight).

In apps that run in macOS 10.10 and later, the previous property type of [`NSPopover.Appearance`](/documentation/AppKit/NSPopover/Appearance-swift.enum) is deprecated. In apps that run in OS X v10.9 and earlier, the [`aqua`](/documentation/AppKit/NSAppearance/Name-swift.struct/aqua) appearance is automatically set on popover content.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)