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# doCommand(by:)

Invokes the action specified by the given selector.

```
func doCommand(by selector: Selector)
```

## Parameters

`selector`

The selector to invoke.

## Discussion

If `selector` cannot be invoked, then `doCommandBySelector:` should not pass this message up the responder chain. `NSResponder` also implements this method, and it does forward uninvokable commands up the responder chain, but a text view should not. A text view implementing the `NSTextInputClient` protocol inherits from `NSView`, which inherits from `NSResponder`, so your implementation of this method will override the one in `NSResponder`. It should not call `super`.

## See Also

[`interpretKeyEvents(_:)`](/documentation/AppKit/NSResponder/interpretKeyEvents(_:))

Handles a series of key events.


---

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