---
title: keyEquivalentModifierMask
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nsbutton/keyequivalentmodifiermask
---

# keyEquivalentModifierMask

The mask specifying the modifier keys for the button’s key equivalent.

## Declaration

```swift
var keyEquivalentModifierMask: NSEvent.ModifierFlags { get set }
```

## Discussion

Discussion This property contains the mask specifying the modifier keys that are applied to the button’s key equivalent. Mask bits are defined in Modifier Flags. The only mask bits relevant in button key-equivalent modifier masks are NSControlKeyMask, NSAlternateKeyMask, and NSCommandKeyMask.

## See Also

### Accessing key equivalents

- [keyEquivalent](appkit/nsbutton/keyequivalent.md)