# prepare(for:sender:) Called when a segue is about to be performed. ``` @MainActor optional func prepare(for segue: NSStoryboardSegue, sender: Any?) ``` ## Parameters `segue` The segue object containing information about the view controllers involved in the segue. `sender` The object that initiated the segue. You might use this parameter to perform different actions based on which control (or other object) initiated the segue. ## Discussion The default implementation of this method does nothing; you can override it to pass relevant data to the new view controller or window controller, based on the context of the segue. The `segue` object describes the transition and includes references to both controllers involved in the segue. Segues can be triggered from multiple sources, so use the information in the `segue` and `sender` parameters to disambiguate between different logical paths in your app. For example, if the segue originated from a table view, the `sender` parameter would identify the cell that the user clicked. You could use that information to set the data on the destination view controller. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)