iOS (Compat) Liveness SDK

Our iOS SDK enables seamless integration of real-time liveness detection into your mobile applications. To get started with our SDK, follow the guide below:

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Youverify Liveness SDK Compat is the compatibility version of the iOS SDK, designed for integrating active liveness detection into UIKit-based applications. This SDK is tailored for apps that need to support iOS 12 and later, providing a reliable solution for older iOS versions.

Features

• Active Liveness Detection: Requires users to perform specific actions (e.g., head movements, answering questions) to confirm liveness. Available on iOS 12+.

• Built with UIKit, ensuring compatibility with legacy iOS applications.

Note: Passive liveness detection is not supported in this version.

Installation

Step 1: Add to Podfile

Add the following to your Podfile:

pod 'YouverifyLivenessSDKCompat'
pod 'MediaPipeTaskVision'

Step 2: Install Dependencies

Run this command in your terminal:

pod install

Step 3: Open Workspace

Open the generated .xcworkspace file in Xcode.

Project Configuration

To avoid linker errors:

1. Open your project in Xcode.

2. Go to Project > Pods.

3. Under Other Linker Flags (OTHER_LDFLAGS) for both .debug and .release, ensure the following are not present:

   • force-load

   • -framework mediaPipetaskvision

   • -framework mediataskCommon

---

Usage

1. Import the SDK

In your Swift file:

import YouverifyLivenessSDK

2. Initialize the SDK

Create an instance of YVLiveness with your configuration:

private var yvLiveness = YVLiveness(
    publicKey: Environment.shared.value(forKey: "API_KEY") ?? "",
    user: YVLivenessUser(firstName: "Ugochukwu"),
    onSuccess: { data in
        print("The success data is \(data)")
    },
    onFailure: { errorData in
        print("The error data is \(errorData)")
    },
    sandboxEnvironment: false
)

• The publicKey is dynamically retrieved from an environment variable (Environment.shared.value(forKey: "API_KEY") ?? "") in the working code. Replace this with your actual API key or retrieval logic.

• The user parameter requires a firstName, while optional fields like lastName and email can be added if needed (see Configuration Options).

3. Start Liveness Detection

Launch the SDK with a list of tasks:

yvLiveness.startSDK(tasks: tasks)
DispatchQueue.main.async {
    self.addLivenessViewController()
}

4. Manage the Liveness View Controller

Add these methods to handle the liveness UI:

private var livenessViewController: YVLivenessViewController?

private func addLivenessViewController() {
    guard livenessViewController == nil else { return }
    let vc = YVLivenessViewController(sdk: yvLiveness)
    vc.delegate = self
    addChild(vc)
    view.addSubview(vc.view)
    vc.didMove(toParent: self)
    livenessViewController = vc
}

private func removeLivenessViewController() {
    guard let vc = livenessViewController else { return }
    vc.willMove(toParent: nil)
    vc.view.removeFromSuperview()
    vc.removeFromParent()
    livenessViewController = nil
}

• The guard statement in addLivenessViewController() prevents duplicate additions of the view controller.

5. Handle Modal Closing

Implement the delegate to close the liveness UI:

extension MainViewController: YVLivenessViewDelegate {
    func closeModal() {
        DispatchQueue.main.async {
            self.removeLivenessViewController()
        }
    }
}

---

Configuration Options

Option	Type	Required	Description	Default	Possible Values
publicKey	String	Yes	Your API key for authentication	-	Any string
user	Class	Yes	User details (requires firstName)	-	See below
user.firstName	String	Yes	User’s first name	-	Any string
user.lastName	String	No	User’s last name	nil	Any string
user.email	String	No	User’s email	nil	Any string
onSuccess	Function	No	Callback on success with liveness data	nil	Any function
onFailure	Function	No	Callback on failure with error data	nil	Any function
sandboxEnvironment	Bool	No	Toggle sandbox mode for testing	true	true, false

---

Available Tasks

Tasks verify liveness through user interactions. Below are the supported options:

Complete The Circle

Users trace a circle with head movements.

Option	Type	Required	Description	Default	Values
difficulty	TaskDifficulty	No	Task difficulty	.medium	.easy, .medium, .hard
timeout	Number	No	Time (ms) before task fails	nil	Any milliseconds

Example:

TaskProperties(task: .completeTheCircle(CompleteTheCircleTask(difficulty: .medium)))

Yes or No

Users answer questions by tilting their head (right = yes, left = no).

Option	Type	Required	Description	Default	Values
difficulty	TaskDifficulty	No	Task difficulty	.medium	.easy, .medium, .hard
timeout	Number	No	Time (ms) before task fails	nil	Any milliseconds
questions	Array	Yes	List of yes/no questions	-	See below
questions.question	String	Yes	Yes/no question	-	Any string
questions.answer	Bool	Yes	Correct answer	-	true, false
questions.errorMessage	String	No	Message on wrong answer	nil	Any string

Example:

TaskProperties(task: .yesOrNo(YesOrNoTask(questions: [YesOrNoQuestion(question: "Is 2 + 2 = 7?", answer: false)])))

Motions

Users perform nods, blinks, or mouth movements.

Option	Type	Required	Description	Default	Values
difficulty	TaskDifficulty	No	Task difficulty	.medium	.easy, .medium, .hard
timeout	Number	No	Time (ms) before task fails	nil	Any milliseconds
maxNods	Int	No	Max nods to perform	5	Any number
maxBlinks	Int	No	Max blinks to perform	5	Any number

Example:

TaskProperties(task: .motions(MotionsTaskClass(difficulty: .medium)))

---

Liveness Data

The onSuccess callback returns:

Field	Type	Description
faceImage	String	User’s face image
livenessClip	String	Video of liveness check
passed	Bool	True if passed, false if failed
metadata	Any	Metadata from initialization

The onFailure callback returns error details as a string or object, depending on the issue.

---

Full Example

Here’s the complete implementation from the working code:

import UIKit
import YouverifyLivenessSDK

class MainViewController: UIViewController {
    private var yvLiveness = YVLiveness(
        publicKey: Environment.shared.value(forKey: "API_KEY") ?? "",
        user: YVLivenessUser(firstName: "Ugochukwu"),
        onSuccess: { data in
            print("The success data is \(data)")
        },
        onFailure: { errorData in
            print("The error data is \(errorData)")
        },
        sandboxEnvironment: false
    )
    
    private var livenessViewController: YVLivenessViewController?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Create a vertical stack view
        let stackView = UIStackView()
        stackView.axis = .vertical
        stackView.spacing = 10
        stackView.translatesAutoresizingMaskIntoConstraints = false
        
        // Create buttons
        let completeCircleButton = createButton(title: "Complete the Circle", action: #selector(completeTheCircleTapped))
        let yesOrNoButton = createButton(title: "Yes or No", action: #selector(yesOrNoTapped))
        let motionsButton = createButton(title: "Motions", action: #selector(motionsTapped))
        let passiveLivenessButton = createButton(title: "Passive Liveness", action: #selector(passiveLivenessTapped))
        
        // Add buttons to stack view
        stackView.addArrangedSubview(completeCircleButton)
        stackView.addArrangedSubview(yesOrNoButton)
        stackView.addArrangedSubview(motionsButton)
        stackView.addArrangedSubview(passiveLivenessButton)
        
        // Add stack view to the main view
        view.addSubview(stackView)
        
        // Set Auto Layout constraints
        NSLayoutConstraint.activate([
            stackView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20)
        ])
    }
    
    private func addLivenessViewController() {
        guard livenessViewController == nil else { return } // Prevent duplicate adds
        let vc = YVLivenessViewController(sdk: yvLiveness)
        vc.delegate = self
        
        addChild(vc)
        
        view.addSubview(vc.view)
        vc.didMove(toParent: self)
        livenessViewController = vc
    }

    private func removeLivenessViewController() {
        guard let vc = livenessViewController else { return }
        vc.willMove(toParent: nil)
        vc.view.removeFromSuperview()
        vc.removeFromParent()
        livenessViewController = nil
    }
    
    // Helper function to create buttons with actions
    private func createButton(title: String, action: Selector) -> UIButton {
        let button = UIButton(type: .system)
        button.setTitle(title, for: .normal)
        button.addTarget(self, action: action, for: .touchUpInside)
        return button
    }
    
    // MARK: - Button Actions
    
    private func startLiveness(with tasks: [TaskProperties]) {
        yvLiveness.startSDK(tasks: tasks)
        DispatchQueue.main.async {
            self.addLivenessViewController()
        }
    }
    
    @objc private func completeTheCircleTapped() {
        startLiveness(with: [
            TaskProperties(task: .completeTheCircle(CompleteTheCircleTask(difficulty: .medium)))
        ])
    }
    
    @objc private func yesOrNoTapped() {
        startLiveness(with: [TaskProperties(
            task: .yesOrNo(YesOrNoTask(questions: [YesOrNoQuestion(question: "Is 2 + 2 = 7?", answer: false)]))
        )])
    }
    
    @objc private func motionsTapped() {
        startLiveness(with: [TaskProperties(
            task: .motions(MotionsTaskClass(difficulty: .medium))
        )])
    }
    
}

extension MainViewController: YVLivenessViewDelegate {
    func closeModal() {
        DispatchQueue.main.async {
            self.removeLivenessViewController()
        }
    }
}

Credits

This SDK is developed and maintained solely by Youverify