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# beginSheet(for:modalDelegate:didEnd:contextInfo:settings:keychain:)

Displays a sheet that allows users to change keychain settings.

```
func beginSheet(for docWindow: NSWindow!, modalDelegate delegate: Any!, didEnd didEndSelector: Selector!, contextInfo: UnsafeMutableRawPointer!, settings: UnsafeMutablePointer<SecKeychainSettings>!, keychain: SecKeychain!)
```

## Parameters

`docWindow`

The parent window to which the sheet is attached. If this parameter is `nil`, the behavior defaults to a standalone modal window.

`delegate`

The delegate object in which the method specified in the `didEndSelector` parameter is implemented.

`didEndSelector`

A method selector for a delegate method called after the modal session has ended, but before the sheet has been dismissed. Implementation of this delegate method is optional.

`contextInfo`

A pointer to data that is passed to the delegate method. You can use this data pointer for any purpose you wish.

`settings`

A pointer to a keychain settings structure. Because this structure is versioned, you must preallocate it and fill in the version of the structure.

`keychain`

The keychain whose settings you wish to have the user change.

## Discussion

The delegate method has the following signature:

```objc
- (void)createPanelDidEnd:(NSWindow *)sheet
        returnCode:(int)returnCode
        contextInfo:(void *)contextInfo
```

The parameters for the delegate method are:

- `sheet`: The window to which the sheet was attached.
- `returnCode`: The result code indicating which button the user clicked: either <doc://com.apple.documentation/documentation/AppKit/NSFileHandlingPanelOKButton> or <doc://com.apple.documentation/documentation/AppKit/NSFileHandlingPanelCancelButton>.
- `contextInfo`: Client-defined contextual data that is passed in the `contextInfo` parameter of the `beginSheetForDirectory:...` method.

The delegate method may dismiss the keychain settings sheet itself; if it does not, the sheet is dismissed on return from the `beginSheetForDirectory:...` method.

---

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