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# NSTextCheckingTypes

Defines the types of checking that are available. These values can be combined using the C-bitwise OR operator. The system supports its own internal types, and the user can extend those types by subclassing `NSTextCheckingResult` and adding their own custom types.

```
typealias NSTextCheckingTypes = UInt64
```

## Topics

### Constants

[`NSTextCheckingAllSystemTypes`](/documentation/Foundation/NSTextCheckingAllSystemTypes)

Checking types supported by the system. The first 32 types are reserved.

[`NSTextCheckingAllCustomTypes`](/documentation/Foundation/NSTextCheckingAllCustomTypes)

Checking types that can be used by clients.

[`NSTextCheckingAllTypes`](/documentation/Foundation/NSTextCheckingAllTypes)

All possible checking types, both system- and user-supported.


---

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