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# save(to:ofType:for:delegate:didSave:contextInfo:)

Saves the contents of the document to a file or file package located by a URL, that is formatted to a specified type, for a particular kind of save operation.

```
func save(to url: URL, ofType typeName: String, for saveOperation: NSDocument.SaveOperationType, delegate: Any?, didSave didSaveSelector: Selector?, contextInfo: UnsafeMutableRawPointer?)
```

## Parameters

`url`

The location of the file or file package to which the document contents are saved.

`typeName`

The string that identifies the document type.

`saveOperation`

The type of save operation.

`delegate`

The delegate to which the selector message is sent.

`didSaveSelector`

The selector of the message sent to the delegate.

`contextInfo`

Object passed with the callback to provide any additional context information.

## Discussion

When saving is completed, regardless of success or failure, the method sends the message selected by `didSaveSelector` to the `delegate`, with the `contextInfo` as the last argument. The method selected by `didSaveSelector` must have the same signature as:

```objc
- (void)document:(NSDocument *)document didSave:(BOOL)didSaveSuccessfully  contextInfo:(void  *)contextInfo;
```

The default implementation of this method invokes `[self saveToURL:absoluteURL ofType:typeName forSaveOperation:saveOperation error:&anError]` and, if <doc://com.apple.documentation/documentation/Swift/false> is returned, presents the error to the user in a document-modal panel before messaging the delegate.

## See Also

[`-  saveToURL:ofType:forSaveOperation:error:`](/documentation/AppKit/NSDocument/saveToURL:ofType:forSaveOperation:error:)

Saves the contents of the document to a file or file package located by a URL, formatted to a specified type, for a particular kind of save operation.


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