---
title: "invalidCharacterEntered(in:)"
framework: cryptotokenkit
role: symbol
role_heading: Instance Method
path: "cryptotokenkit/tksmartcarduserinteractiondelegate/invalidcharacterentered(in:)"
---

# invalidCharacterEntered(in:)

Tells the delegate that an invalid character has been entered.

## Declaration

```swift
optional func invalidCharacterEntered(in interaction: TKSmartCardUserInteraction)
```

## Parameters

- `interaction`: The user interaction.

## See Also

### Delegate Methods

- [characterEntered(in:)](cryptotokenkit/tksmartcarduserinteractiondelegate/characterentered(in:).md)
- [correctionKeyPressed(in:)](cryptotokenkit/tksmartcarduserinteractiondelegate/correctionkeypressed(in:).md)
- [validationKeyPressed(in:)](cryptotokenkit/tksmartcarduserinteractiondelegate/validationkeypressed(in:).md)
- [oldPINRequested(in:)](cryptotokenkit/tksmartcarduserinteractiondelegate/oldpinrequested(in:).md)
- [newPINRequested(in:)](cryptotokenkit/tksmartcarduserinteractiondelegate/newpinrequested(in:).md)
- [newPINConfirmationRequested(in:)](cryptotokenkit/tksmartcarduserinteractiondelegate/newpinconfirmationrequested(in:).md)