> For the complete documentation index, see [llms.txt](https://docs.caf.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.caf.io/caf-sdk/ios/standalone-modules/caffacelivenesslite/builder.md).

# Building the SDK

Quick links: [Overview](/caf-sdk/ios/standalone-modules/caffacelivenesslite.md) | [Building the SDK](/caf-sdk/ios/standalone-modules/caffacelivenesslite/builder.md) | [Start Liveness Verification](/caf-sdk/ios/standalone-modules/caffacelivenesslite/start-sdk.md) | [UI Customization](/caf-sdk/ios/standalone-modules/caffacelivenesslite/ui-customization.md) | [Installation](/caf-sdk/ios/standalone-modules/caffacelivenesslite/installation.md) | [Current Version](/caf-sdk/ios/standalone-modules/caffacelivenesslite/current-version.md) | [Requirements](/caf-sdk/ios/standalone-modules/caffacelivenesslite/requirements.md) | [Source Code](/caf-sdk/ios/standalone-modules/caffacelivenesslite/source-code.md) | [Result Reference](/caf-sdk/ios/standalone-modules/caffacelivenesslite/result-reference.md) | [Release Notes](/caf-sdk/ios/standalone-modules/caffacelivenesslite/release-notes.md) | [FAQ](/caf-sdk/ios/standalone-modules/caffacelivenesslite/faq_caf_face_liveness_sdk.md)

## Creating a Liveness SDK instance

Instantiate `CafFaceLivenessLiteSDK` directly and configure behavior via the constructor and `startSDK` parameters.

### Constructor

```swift
CafFaceLivenessLiteSDK(enableSecurity: Bool = true)
```

| Parameter        | Type | Required | Description                                                                                                                                                         |
| ---------------- | ---- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `enableSecurity` | Bool | No       | Enables security monitoring: jailbreak detection, instrumentation detection, and dylib monitoring. Default: `true`. Disable only in automated testing environments. |

### startSDK Parameters

| Parameter                  | Type                   | Required | Description                                                                                                                                                                               |
| -------------------------- | ---------------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `mobileToken`              | String                 | Yes      | Mobile authentication token                                                                                                                                                               |
| `personId`                 | String                 | Yes      | Person ID for liveness                                                                                                                                                                    |
| `environment`              | CafEnvironment (enum)  | No       | `.prod` (default), `.beta`, `.dev`                                                                                                                                                        |
| `loading`                  | Bool                   | No       | Shows SDK loading screen (default: `true`)                                                                                                                                                |
| `customLocalization`       | String?                | No       | Use a custom strings table/bundle prefix (e.g., `"stringsBundle"`)                                                                                                                        |
| `customLocalizationBundle` | Bundle?                | No       | Bundle that contains the custom strings table (maps to iProov `options.stringsBundle`)                                                                                                    |
| `uiCustomization`          | CerttaUiCustomization? | No       | Optional visual branding for the liveness screen: header bar, prompt, mask area and font. See [UI Customization](/caf-sdk/ios/standalone-modules/caffacelivenesslite/ui-customization.md) |

Note: `customLocalization` maps to the iProov strings table name (omit the `.strings` extension). When strings live outside the main app bundle (for example inside a redistributed framework), also pass `customLocalizationBundle`. See the iProov localization guide: [iProov Localization](https://github.com/iProov/ios/wiki/Localization).

{% hint style="info" %}
From **2.0.0**, Face Auth (`executeFaceAuth`) is no longer available on Lite. After a successful capture the SDK starts an async transaction and returns only `signedResponse`; your backend retrieves the final liveness result out-of-band.
{% endhint %}

### Example

```swift
import CafFaceLivenessLite

final class YourViewController: UIViewController {
    private let sdk = CafFaceLivenessLiteSDK(enableSecurity: true)

    override func viewDidLoad() {
        super.viewDidLoad()
        sdk.delegate = self
    }

    private func start() {
        sdk.startSDK(
            viewController: self,
            mobileToken: "your_mobile_token",
            personId: "your_person_id",
            customLocalization: nil,
            customLocalizationBundle: nil,
            environment: .prod,
            loading: true
        )
    }
}
```


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