<!--
{
  "availability" : [
    "iOS: 10.0.0 -",
    "iPadOS: 10.0.0 -",
    "macCatalyst: 13.1.0 -",
    "macOS: 10.12.0 -",
    "tvOS: 11.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 4.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CryptoTokenKit",
  "identifier" : "/documentation/CryptoTokenKit/TKTokenKeychainItem/constraints",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "CryptoTokenKit"
    ],
    "preciseIdentifier" : "c:objc(cs)TKTokenKeychainItem(py)constraints"
  },
  "title" : "constraints"
}
-->

# constraints

Access constraints for the keychain item, keyed by [`TKTokenOperation`](/documentation/CryptoTokenKit/TKTokenOperation) values wrapped in <doc://com.apple.documentation/documentation/Foundation/NSNumber> objects.

```
var constraints: [NSNumber : Any]? { get set }
```

---

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)