react-native-local-authentication

Local authentication for react native, supports iOS only. See iOS Local Authentication Document

• react-native-local-authentication
  • Install
  • Usage
    • setLocalizedFallbackTitle(title)
    • setLocalizedCancelTitle(title)
    • canEvaluate(policy)
      • Parameters
      • Response
    • evaluate(policy, localizedReason)
      • parameters
      • Response
    • invalidate()
    • LAError
  • Example

Install

npm i --save react-native-local-authentication
react-native link react-native-local-authentication

Usage

setLocalizedFallbackTitle(title)

Set fallback button title.

setLocalizedCancelTitle(title)

Set cancel button title.

canEvaluate(policy)

Determines if a particular policy can be evaluated.

Parameters

• policy

The policy to evaluate.

see LAPolicy

Response

Successful

see LABiometryType

• none: No biometry type is supported.
• touchID: The device supports Touch ID.
• faceID: The device supports Face ID.

Failed

• code: see LAError
• message: error message

evaluate(policy, localizedReason)

parameters

• policy

Policy for which the preflight check should be run.

• localizedReason

Policy for which the preflight check should be run.

Response

Successful

return true

Failed

• code: see LAError
• message: error message

invalidate()

Invalidates the context.

LAError

error code

• LAErrorAuthenticationFailed
• LAErrorUserCancel
• LAErrorUserFallback
• LAErrorSystemCancel
• LAErrorPasscodeNotSet
• LAErrorTouchIDNotAvailable DEPRECATED
• LAErrorTouchIDNotEnrolled DEPRECATED
• LAErrorTouchIDLockout DEPRECATED
• LAErrorAppCancel
• LAErrorInvalidContext
• LAErrorNotInteractive
• LAErrorBiometryNotAvailable
• LAErrorBiometryNotEnrolled
• LAErrorBiometryLockout

Example

import RNLocalAuthentication, { LAError, LABiometryType } from 'react-native-local-authentication';

async _evaluate() {
  try {
    const biometryType = await RNLocalAuthentication.canEvaluate();
    if (biometryType && (biometryType === LABiometryType.touchID || LABiometryType.faceID)) {
      const result = await RNLocalAuthentication.evaluate(1, biometryType === LABiometryType.touchID ? 'Evaluate Touch ID' : 'Evaluate Face ID');
      console.log('evaluate', result ? 'evaluate successful' : 'evaluate failed');
      Alert.alert('evaluate', result ? 'successful' : 'failed');
    } else {
      Alert.alert('Can not evaluate', biometryType);
    }
  } catch (e) {
    console.log('evaluate', e.code, e.message, e);
    if (parseInt(e.code) === LAError.LAErrorTouchIDNotAvailable) {
      Alert.alert('Error', 'device does not support touch ID or face ID');
    } else {
      Alert.alert('Error', e.message);
    }
  }
};