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# delegate

The window’s delegate.

```
weak var delegate: (any NSWindowDelegate)? { get set }
```

## Discussion

The value of this property is `nil` if the window doesn’t have a delegate.

A window object’s delegate is inserted in the responder chain after the window itself and is informed of various actions by the window through delegation messages.

## See Also

[`-  tryToPerform:with:`](/documentation/AppKit/NSWindow/tryToPerform(_:with:))

Dispatches action messages with a given argument.

[`-  sendAction:to:from:`](/documentation/AppKit/NSApplication/sendAction(_:to:from:))

Sends the given action message to the given target.


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