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# init(deviceMatchingDictionary:interfaceMatchingDictionaries:interfaceMatchingOption:)

Initializes a criteria object using USB interface matching dictionaries, for the provided USB device matching criteria.

```
init?(deviceMatchingDictionary: [String : any Sendable]?, interfaceMatchingDictionaries: [[String : any Sendable]], interfaceMatchingOption: AAUSBAccessoryMatchingCriteria.InterfaceMatchingOption)
```

## Parameters

`deviceMatchingDictionary`

USB device matching dictionary.

`interfaceMatchingDictionaries`

USB interface matching criteria.

`interfaceMatchingOption`

Option specifying how the framework performs interface matching for a USB accessory. For more information on interface matching options, see [`Understanding interface matching options`](/documentation/AccessoryAccess/AAUSBAccessoryMatchingCriteria/init(deviceMatchingDictionary:interfaceMatchingDictionaries:interfaceMatchingOption:)#Understanding-interface-matching-options).

## Discussion

Use <doc://com.apple.documentation/documentation/IOUSBHost/IOUSBHostDevice/createMatchingDictionaryWithVendorID:productID:bcdDevice:deviceClass:deviceSubclass:deviceProtocol:speed:productIDArray:> to create a USB device matching dictionary.

Use <doc://com.apple.documentation/documentation/IOUSBHost/IOUSBHostInterface/createMatchingDictionaryWithVendorID:productID:bcdDevice:interfaceNumber:configurationValue:interfaceClass:interfaceSubclass:interfaceProtocol:speed:productIDArray:> to create a USB interface matching dictionary.

See USBSpec.h in <doc://com.apple.documentation/documentation/iokit/usbspec_h_user-space> in <doc://com.apple.documentation/documentation/iokit> for more details about dictionary keys for the USB device/interface matching dictionaries.

### Understanding interface matching options

If you initialize the criteria with [`AAUSBAccessoryMatchingCriteria.InterfaceMatchingOption.matchAll`](/documentation/AccessoryAccess/AAUSBAccessoryMatchingCriteria/InterfaceMatchingOption/matchAll), then it evaluates to true for a USB accessory when

- It matches the provided non-`nil` `deviceMatchingDictionary`, and
- For the currently set configuration, all the `interfaceMatchingDictionaries` match at least one of its USB interfaces.

If you initialize the criteria is with [`AAUSBAccessoryMatchingCriteria.InterfaceMatchingOption.matchAny`](/documentation/AccessoryAccess/AAUSBAccessoryMatchingCriteria/InterfaceMatchingOption/matchAny), then it evaluates to true for a USB accessory when

- It matches the provided non-`nil` `deviceMatchingDictionary`, and
- For the currently set configuration, any of the `interfaceMatchingDictionaries` match at least one of its USB interfaces.

---

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