<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macCatalyst: 18.0.0 -",
    "visionOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "PencilKit",
  "identifier" : "/documentation/PencilKit/PKToolPickerCustomItemConfiguration/identifier",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "PencilKit"
    ],
    "preciseIdentifier" : "c:objc(cs)PKToolPickerCustomItemConfiguration(py)identifier"
  },
  "title" : "identifier"
}
-->

# identifier

A string that uniquely identifies the tool in the picker.

```
@property (nonatomic, copy) NSString * identifier;
```

## Discussion

For example, you might use the name `com.example.example-company.custom-tool`. If you use multiple tool items with the same identifier to create the picker, the picker only shows the first instance of that item.

---

Copyright &copy; 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)