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# messageReceivedFromContainingApp(withName:userInfo:)

A method the system calls when the extension receives a message from the extension’s containing app.

```
optional func messageReceivedFromContainingApp(withName messageName: String, userInfo: [String : Any]? = nil)
```

## Parameters

`messageName`

A string that identifies the message.

`userInfo`

Optional message content.

## See Also

[`class func dispatchMessage(withName: String, toExtensionWithIdentifier: String, userInfo: [String : Any]?, completionHandler: (((any Error)?) -> Void)?)`](/documentation/SafariServices/SFSafariApplication/dispatchMessage(withName:toExtensionWithIdentifier:userInfo:completionHandler:))

Sends a message to a Safari app extension, launching Safari if necessary.


---

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