---
title: "shouldPerformSegue(withIdentifier:sender:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nssegueperforming/shouldperformsegue(withidentifier:sender:)"
---

# shouldPerformSegue(withIdentifier:sender:)

Called immediately prior to the performance of a storyboard segue.

## Declaration

```swift
@MainActor optional func shouldPerformSegue(withIdentifier identifier: NSStoryboardSegue.Identifier, sender: Any?) -> Bool
```

## Parameters

- `identifier`: The string that identifies the segue to be performed. Using the Interface Builder inspector, provide a unique identifier string for each segue in a storyboard. The system provides a segue’s identifier to this parameter when it calls this method. The identifier string is used to locate the segue inside the storyboard file that contains the view controller. note: This method throws an https://developer.apple.com/library/archive/documentation/General/Conceptual/DevPedia-CocoaCore/ExceptionHandling.html#//apple_ref/doc/uid/TP40008195-CH18 if there is no segue with the specified identifier.
- `sender`: The object that initiated the segue. This object is made available for informational purposes during the segue.

## Return Value

Return Value true to allow a segue to proceed or false to stop it from proceeding.

## Discussion

Discussion Override this method to return false for cases where you want to prevent the performance of a segue. By default, invocation of a segue results in the segue being performed.

## See Also

### Working with Storyboard Segues

- [performSegue(withIdentifier:sender:)](appkit/nssegueperforming/performsegue(withidentifier:sender:).md)
- [prepare(for:sender:)](appkit/nssegueperforming/prepare(for:sender:).md)