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  "documentType" : "symbol",
  "framework" : "AppKit",
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  "role" : "Protocol",
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  "title" : "NSTextStorageDelegate"
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# NSTextStorageDelegate

The optional methods that delegates of text storage objects implement to handle text-edit processing.

```
protocol NSTextStorageDelegate : NSObjectProtocol
```

## Topics

### Processing edit actions

[`textStorage(_:willProcessEditing:range:changeInLength:)`](/documentation/AppKit/NSTextStorageDelegate/textStorage(_:willProcessEditing:range:changeInLength:))

The method the framework calls when a text storage object is about to process edits.

[`textStorage(_:didProcessEditing:range:changeInLength:)`](/documentation/AppKit/NSTextStorageDelegate/textStorage(_:didProcessEditing:range:changeInLength:))

The method the framework calls when a text storage object has finished processing edits.


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