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# TKSmartCardUserInteraction

The base class for encapsulating user interaction with a Smart Card reader.

```
class TKSmartCardUserInteraction
```

## Overview

There are two types of user interactions: those for secure PIN change and those for secure PIN validation. These interactions are instances of the [`TKSmartCardUserInteractionForSecurePINChange`](/documentation/CryptoTokenKit/TKSmartCardUserInteractionForSecurePINChange), or [`TKSmartCardUserInteractionForSecurePINVerification`](/documentation/CryptoTokenKit/TKSmartCardUserInteractionForSecurePINVerification) subclasses of [`TKSmartCardUserInteractionForPINOperation`](/documentation/CryptoTokenKit/TKSmartCardUserInteractionForPINOperation), respectively. [`TKSmartCardUserInteractionForPINOperation`](/documentation/CryptoTokenKit/TKSmartCardUserInteractionForPINOperation) is a subclass of `TKSmartCardUserInteraction`.

You interact with instances of one of the subclasses of [`TKSmartCardUserInteractionForPINOperation`](/documentation/CryptoTokenKit/TKSmartCardUserInteractionForPINOperation)when calling the [`userInteractionForSecurePINChange(_:apdu:currentPINByteOffset:newPINByteOffset:)`](/documentation/CryptoTokenKit/TKSmartCard/userInteractionForSecurePINChange(_:apdu:currentPINByteOffset:newPINByteOffset:)) and [`userInteractionForSecurePINVerification(_:apdu:pinByteOffset:)`](/documentation/CryptoTokenKit/TKSmartCard/userInteractionForSecurePINVerification(_:apdu:pinByteOffset:)) methods on an [`TKSmartCard`](/documentation/CryptoTokenKit/TKSmartCard) object.

## Topics

### Handling User Interaction Events

[`delegate`](/documentation/CryptoTokenKit/TKSmartCardUserInteraction/delegate)

The delegate for observing events that occur during the user interaction.

[`TKSmartCardUserInteractionDelegate`](/documentation/CryptoTokenKit/TKSmartCardUserInteractionDelegate)

The interface implemented by a Smart Card user interaction delegate to handle user interaction events.

### Configuring Timeout

[`initialTimeout`](/documentation/CryptoTokenKit/TKSmartCardUserInteraction/initialTimeout)

The timeout, in seconds, for initial interaction. If set to `0`, the reader-defined default timeout is used. `0` by default.

[`interactionTimeout`](/documentation/CryptoTokenKit/TKSmartCardUserInteraction/interactionTimeout)

The timeout, in seconds, after the first key stroke. If set to `0`, the reader-defined default timeout is used. `0` by default.

### Starting and Stopping

[`run(reply:)`](/documentation/CryptoTokenKit/TKSmartCardUserInteraction/run(reply:))

Runs the user interaction and asynchronously receives a reply.

[`cancel()`](/documentation/CryptoTokenKit/TKSmartCardUserInteraction/cancel())

Attempts to cancel an interaction started by calling [`run(reply:)`](/documentation/CryptoTokenKit/TKSmartCardUserInteraction/run(reply:)). For certain interactions, cancellation may not be available.


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