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  • Swift SDK

    Introduction

    Welcome to the developer documentation for the Kameleoon Swift SDK! Our SDK gives you the possibility of running experiments and activating feature flags on native mobile iOS applications. Integrating our SDK into your applications is relatively easy, and its footprint (in terms of memory and network usage) is low.

    You can refer to the SDK reference to check out all possible features of the SDK. Also make sure you check out our Getting started tutorial which we have prepared to walk you through the installation and implementation.

    Latest version of the Swift SDK: 2.0.10.

    Getting started

    This guide is designed to help you integrate our SDK in a few minutes and start running experiments in your iOS applications. This tutorial will explain the setup of a simple A/B test to change the number of recommended products based on different variations.

    Creating an experiment

    First, you must create an experiment in the Kameleoon back-office so that our platform is aware of the new A/B test you're planning to implement on your side. Make sure that mobile application type is chosen as shown below:

    Server-side experiment

    Upon successful creation of the experiment, you will need to get its ID to use in the SDK as an argument to the triggerExperiment() method.

    Installing the SDK

    Installing the Swift client

    We currently support either CocoaPods or Swift Package Manager as methods of installation.

    # Podfile
    use_frameworks!
    
    target 'YOUR_TARGET_NAME' do
        pod 'kameleoonClient'
    end
    

    With CocoaPods, use the code to the right in your Podfile, replacing "YOUR_TARGET_NAME" with the correct value. Then in the Podfile directory, type:

    $ pod install
    
      dependencies: [
        .package(url: "https://github.com/Kameleoon/client-swift.git", from("2.0.10"))
      ],
    )
    

    With Swift Package Manager, it is recommended to add a package dependency to your Xcode project. Select File > Swift Packages > Add Package Dependency and enter its repository URL: https://github.com/Kameleoon/client-swift.

    Alternatively, modify your Package.swift file directly as shown in the example to the right.

    Additional configuration

    A .plist configuration file can also be used to customize the SDK behavior. A sample configuration file can be obtained here. This file should be installed in the root directory of your Xcode project, and should be named exactly kameleoon-client-swift.plist. With the current version of the Swift SDK, those are the available keys:

    Initializing the Kameleoon Client

    import kameleoonClient
    
    public class KameleoonDelegate
    {
        private let siteCode = "a8st4f59bj"
        public let kameleoonClient = KameleoonClientFactory.create(sitecode: siteCode)
    }
    

    After installing the SDK into your application and setting up an server-side experiment on Kameleoon's back-office, the next step is to create the Kameleoon client.

    The code on the right gives a clear example. A Client is a singleton object that acts as a bridge between your application and the Kameleoon platform. It includes all the methods and properties you will need to run an experiment.

    While executing the KameleoonClientFactory.create() method initializes the client, on iOS it is not immediately ready for use. This is because the current configuration of experiments (along with their traffic repartition) has to be retrieved from a Kameleoon remote server. This requires network access, which is not always available. Until the Kameleoon client is fully ready, you should not try to run any other method in our SDK. Note that once the first configuration of experiments is fetched, it is then periodically refreshed, but even if the refresh fails for any reason, the Kameleoon client will still be ready and working (but on an outdated / previous configuration).

    We provide the .ready public getter to know if the Kameleoon client initialization completed.

    Alternatively, we provide a helper callback to encapsulate logic of experiment triggering and variation implementation. What approach (.ready or callback) is best to use depends on your own preferences and on the exact use case at hand. As a rule of thumb, we recommend using .ready when it is expected that the SDK will indeed be ready for use. For instance, if you are running an experiment on some dialog that would be accessible only after a few seconds / minutes of navigation within the application. And we recommend to use the callback when there is a high probability that the SDK is still in the process of initialization. For instance, an experiment that would take place at the launch of the application would be better treated with a callback that would make the application wait until either the SDK is ready or a specified timeout has expired.

    Triggering an experiment

    Running an A/B experiment on your iOS application means bucketing your users into several groups (one per variation). The SDK takes care of this bucketing (and the associated reporting) automatically.

    Triggering an experiment by calling the triggerExperiment() method will register a random variation for a given visitorCode. If this visitorCode is already associated with a variation (most likely the user had already been exposed to the experiment previously), then it will return the previous variation associated with a given experiment.

    import kameleoonClient
    
    @UIApplicationMain
    class AppDelegate: UIResponder, UIApplicationDelegate {
        func applicationWillEnterForeground(_ application: UIApplication) {
            let kameleoonClient = kameleoonDelegate.kameleoonClient
            let visitorCode = "1267576" // usually, this would be the internal ID of the current user
            var variationID : Int
            var recommendedProductsNumber : Int
    
            if (kameleoonClient.ready) {
                variationID = try? kameleoonClient.triggerExperiment(visitorCode, 75253) ?? 0
            }
            else {
                // The SDK is not ready, so the user is "out of the experiments". This is the same as if he was bucketed into the reference
                variationID = 0
            }
    
            if (variationID == 0)) {
                //This is the default / reference number of products to display
                recommendedProductsNumber = 5
            }
            else if (variationID == 148382) {
                //We are changing number of recommended products for this variation to 10
                recommendedProductsNumber = 10
            }
            else if (variationID == 187791) {
                //We are changing number of recommended products for this variation to 8
                recommendedProductsNumber = 8
            }
        }
    }
    

    We provide two code samples to illustrate the triggering of an experiment. The first one uses the .ready approach. It's a bit simpler.

    import kameleoonClient
    
    @UIApplicationMain
    class AppDelegate: UIResponder, UIApplicationDelegate {
        func applicationWillEnterForeground(_ application: UIApplication) {
            let kameleoonClient = kameleoonDelegate.kameleoonClient
            let visitorCode = "1267576" // usually, this would be the internal ID of the current user
            var variationID : Int
            var recommendedProductsNumber : Int
            kameleoonClient.runWhenReady(1000) { success in
                if (success)
                {
                    variationID = try? kameleoonClient.triggerExperiment(visitorCode, 75253) ?? 0
                    if (variationID == 0)) {
                        // This is the default / reference number of products to display
                        recommendedProductsNumber = 5
                    }
                    else if (variationID == 148382) {
                        // We are changing number of recommended products for this variation to 10
                        recommendedProductsNumber = 10
                    }
                    else if (variationID == 187791) {
                        // We are changing number of recommended products for this variation to 8
                        recommendedProductsNumber = 8
                    }
                }
                else
                {
                    variationID = 0
                    recommendedProductsNumber = 5
                }
            }
        }
    }
    

    This is a second example with the callback runWhenReady() approach. You need to pass a lambda as a second argument, with signature (Bool) -> Void. The boolean that will be passed indicates if the SDK is ready or if the timeout was reached. Note that here we used a timeout of 1000 milliseconds.

    Implementing variation code

    var recommendedProductsNumber : Int
    
    if (variationID == 0)) {
        // This is the default / reference number of products to display
        recommendedProductsNumber = 5
    }
    else if (variationID == 148382) {
        // We are changing number of recommended products for this variation to 10
        recommendedProductsNumber = 10
    }
    else if (variationID == 187791) {
        // We are changing number of recommended products for this variation to 8
        recommendedProductsNumber = 8
    }
    

    To execute different code paths depending on the variation assigned to the visitor, you will need the list of all the experiment's variation IDs. You can find these variation IDs (as well as the experiment ID) by opening the experiment in the back-office interface. By convention, the reference (original variation) always has an ID equal to 0.

    Once you have the IDs of the different variations, you can implement a different action for each variation, and one of the code paths will be executed, based on the associated variationID for the current visitor. Generally, this can be done using a simple if / else or switch mechanism. In our example, we just change the number of recommended products with two different variations.

    Get variationID

    Tracking conversion

    let visitorCode = UUID().uuidString
    
    kameleoonClient.trackConversion(visitorCode : "1267576", goalID : 83023, revenue: 1.0) { success in
        if success {
            // callback code
        }
    }
    

    After you are done with triggering an experiment, the next step is usually to start tracking conversions. This is done to measure performance characteristics according to the goals that make sense for your business.

    For this purpose, use the trackConversion() method of the SDK as shown in the example. You need to pass the visitorCode and goalID parameters so we can correctly track conversion for this particular user.

    Get goalID

    Obtaining results

    Once your implementation is in place on the mobile app side (experiment triggering, variations handling, and conversion tracking), it is time to launch the experiment on the Kameleoon platform. You do this in the same way as for a front-end test. Basic operations such as starting, pausing and stopping the experiment work exactly in the same way.

    After the experiment is launched, first results will be available on our standard results page in the back-office after a duration of 30 minutes. This is because (as is the case with front-end testing) visits are considered over after 30 minutes of inactivity. Inactivity in this context means the absence of calls sent to the Kameleoon back-end servers (such calls are made via triggerExperiment(), trackConversion() or flush() methods).

    Reference

    This is a full reference documentation of the Swift SDK.

    If this is your first time working with the Swift SDK, we strongly recommend you go over our Getting started tutorial to integrate the SDK and start experimenting in a few minutes.

    KameleoonClientFactory

    create

    let kameleoonClient = KameleoonClientFactory.create(sitecode: siteCode)
    

    The starting point for using the SDK is the initialization step. All interaction with the SDK is done through an object named KameleoonClient, therefore you need to create this object.

    Arguments
    NameTypeDescription
    siteCodeStringCode of the website you want to run experiments on. This unique code id can be found in our platform's back-office. This field is mandatory.

    KameleoonClient

    isReady

    let ready = kameleoonClient.ready
    

    For mobile SDKs, the initialization of the Kameleoon Client is not immediate, as it needs to perform a server call to retrieve the current configuration for all active experiments. It is recommended to check if the SDK is ready by calling this method before triggering an experiment. Alternatively, you could setup error catching around the triggerExperiment() method to look for the KameleoonError.sdkNotReady error, or you could use the runWhenReady() method with a callback as detailed in the next paragraph.

    Arguments

    NameTypeDescription

    Return value

    NameTypeDescription
    readyBoolBoolean representing the status of the SDK (properly initialized, or not yet ready to be used).

    runWhenReady

    kameleoonClient.runWhenReady(1000) { success in
        if (success)
        {
            variationID = try? kameleoonClient.triggerExperiment(visitorCode, experimentID) ?? 0
            if (variationID == 0)) {
                // This is the default / reference number of products to display
                recommendedProductsNumber = 5
            }
            else if (variationID == 148382) {
                //We are changing number of recommended products for this variation to 10
                recommendedProductsNumber = 10
            }
            else if (variationID == 187791) {
                //We are changing number of recommended products for this variation to 8
                recommendedProductsNumber = 8
            }
        }
        else
        {
            variationID = 0
            recommendedProductsNumber = 5
        }
    }
    

    For mobile SDKs, the initialization of the Kameleoon Client is not immediate, as it needs to perform a server call to retrieve the current configuration for all active experiments. The runWhenReady() method of the KameleoonClient class allows to pass a callback that will be executed as soon as the SDK is ready for use. It also allows the use of a timeout.

    The lambda given as second argument to this method must have signature (Bool) -> Void. The lambda will be called with argument true once the Kameleoon client is ready, and should contain code triggering an experiment and implementing variations. The lambda will be called with argument false if the specified timeout happens before the client is initialized. Usually this case should implement the "reference" variation, as the user will be "out of the experiment" if a timeout takes place.

    Arguments

    NameTypeDescription
    timeoutIntTimeout (in milliseconds). Two versions of this method exist, with and without this argument. If not provided, it will use the default value of 2000 milliseconds.
    callback(Bool) -> VoidCallback object. This field is mandatory. It is a lambda expression that will get a Bool argument representing whether the Kameleoon Client became ready before the timeout was reached.

    triggerExperiment

    let visitorCode = UUID().uuidString
    let experimentID = 75253
    
    let variationID = try? kameleoonClient.triggerExperiment(visitorCode, experimentID) ?? 0
    

    To trigger an experiment, call the triggerExperiment() method of our SDK.

    This method takes visitorCode and experimentID as mandatory arguments to register a variation for a given user. If such a user has never been associated with any variation, the SDK returns a randomly selected variation. In case a user with a given visitorCode is already registered with a variation, it will detect the previously registered variation and return the variationID.

    You have to make sure that proper error handling is set up in your code as shown in the example to the right to catch potential errors.

    Arguments
    NameTypeDescription
    visitorCodeStringUnique identifier of the user. This field is mandatory.
    experimentIDIntID of the experiment you want to expose to a user. This field is mandatory.
    Return value
    NameTypeDescription
    variationIDIntID of the variation that is registered for the given visitorCode. By convention, the reference (original variation) always has an ID equal to 0.
    Errors Thrown
    TypeDescription
    KameleoonError.sdkNotReadyError indicating that the SDK has not completed its initialization yet.
    KameleoonError.VisitorCodeNotValidError indicating that the provided visitor code is not valid (empty, or longer than 255 characters).
    KameleoonError.notTargetedError indicating that the current user did not trigger the required targeting conditions for this experiment. The targeting conditions are defined via Kameleoon's segment builder.
    KameleoonError.notActivatedError indicating that the current user triggered the experiment (met the targeting conditions), but did not activate it. The most common reason for that is that part of the traffic has been excluded from the experiment and should not be tracked.
    KameleoonError.experimentConfigurationNotFoundError indicating that the request experiment ID has not been found in the internal configuration of the SDK. This is usually normal and means that the experiment has not yet been started on Kameleoon's side (but code triggering / implementing variations is already deployed on the mobile app's side).

    activateFeature

    let visitorCode = UUID().uuidString
    let featureKey = "new_checkout"
    var hasNewCheckout = false
    
    do {
        hasNewCheckout = try kameleoonClient.activateFeature(visitorCode: visitorCode, featureKey: featureKey)
    } catch {
        if let kameleoonError = error as? KameleoonError {
            switch kameleoonError {
                // Handle error
                hasNewCheckout = false
            }
        }
    }
    
    if hasNewCheckout
    {
        // Implement new checkout code here
    }
    

    To activate a feature toggle, call the activateFeature() method of our SDK.

    This method takes a visitorCode and featureKey (or featureID) as mandatory arguments to check if the specified feature will be active for a given user.

    If such a user has never been associated with this feature flag, the SDK returns a boolean value randomly (true if the user should have this feature or false if not). If a user with a given visitorCode is already registered with this feature flag, it will detect the previous featureFlag value.

    You have to make sure that proper error handling is set up in your code as shown in the example to the right to catch potential errors.

    Arguments
    NameTypeDescription
    visitorCodeStringUnique identifier of the user. This field is mandatory.
    featureID or featureKeyInt or StringID or Key of the feature you want to expose to a user. This field is mandatory.
    Return value
    TypeDescription
    BoolValue of the feature that is registered for a given visitorCode.
    Errors Thrown
    TypeDescription
    KameleoonError.sdkNotReadyError indicating that the SDK has not completed its initialization yet.
    KameleoonError.VisitorCodeNotValidError indicating that the provided visitor code is not valid (empty, or longer than 255 characters).
    KameleoonError.notTargetedError indicating that the current visitor / user did not trigger the required targeting conditions for this feature. The targeting conditions are defined via Kameleoon's segment builder.
    KameleoonError.featureConfigurationNotFoundError indicating that the requested feature ID has not been found in the internal configuration of the SDK. This is usually normal and means that the feature flag has not yet been activated on Kameleoon's side (but code implementing the feature is already deployed on the web-application's side).

    obtainVariationAssociatedData

    let visitorCode = UUID().uuidString
    let experimentID = 75253
    
    do {
        let variationID = kameleoonClient.triggerExperiment(visitorCode, experimentID: experimentID)
        let jsonObject = kameleoonClient.obtainVariationAssociatedData(variationID)
        let firstName = jsonObject["firstName"] as? String
    }
    catch {
        if let kameleoonError = error as? KameleoonError {
            switch kameleoonError {
                // Handle error
            }
        }
    }
    

    To retrieve JSON data associated with a variation, call the obtainVariationAssociatedData() method of our SDK. The JSON data usually represents some metadata of the variation, and can be configured on our web application interface or via our Automation API.

    This method takes the variationID as a parameter and will return the data as a JSON object. It will throw an error (KameleoonError.variationConfigurationNotFound) if the variation ID is wrong or corresponds to an experiment that is not yet online.

    Arguments
    NameTypeDescription
    variationIDIntID of the variation you want to obtain associated data for. This field is mandatory.
    Return value
    TypeDescription
    org.json.JSONObjectData associated with this variationID.
    Errors Thrown
    TypeDescription
    KameleoonError.variationConfigurationNotFoundError indicating that the requested variation ID has not been found in the internal configuration of the SDK. This is usually normal and means that the variation's corresponding experiment has not yet been activated on Kameleoon's side.

    obtainFeatureVariable

    String featureKey = "myFeature"
    String variableKey = "myVariable"
    
    try {
        let variable = kameleoonClient.obtainFeatureVariable(featureKey: featureKey, variableKey: variableKey)
    }
    catch {
        if let kameleoonError = error as? KameleoonError {
            switch kameleoonError {
                // Handle error
            }
        }
    }
    

    To retrieve a feature variable, call the obtainFeatureVariable() method of our SDK. A feature variable can be changed easily via our web application.

    This method takes two input parameters: featureKey and variableKey. It will return the data as a Any instance. Usually it should be casted to the expected type (the one defined on the web interface). It will throw an error (KameleoonError.featureConfigurationNotFound) if the requested feature has not been found in the internal configuration of the SDK.

    Arguments
    NameTypeDescription
    featureID or featureKeyInt or StringID or Key of the feature you want to obtain to a user. This field is mandatory.
    variableKeyStringKey of the variable. This field is mandatory.
    Return value
    TypeDescription
    AnyData associated with this variable for this feature flag. This can be a Decimal, String, Bool or org.json.JSONObject (depending on the type defined on the web interface).
    Errors Thrown
    TypeDescription
    KameleoonError.featureConfigurationNotFoundError indicating that the requested feature ID has not been found in the internal configuration of the SDK. This is usually normal and means that the feature flag has not yet been activated on Kameleoon's side.

    trackConversion

    let visitorCode = UUUID().uuidString
    let goalID = 83023
    
    kameleoonClient.addData(visitorCode : visitorCode, data : Interest(2))
    kameleoonClient.addData(visitorCode : visitorCode, data : Conversion(goalID : 32, revenue : 10.0, negative : false))
    kameleoonClient.trackConversion(visitorCode : visitorCode, goalID : goalID, revenue: 10.0)
    

    To track conversion, use the trackConversion() method. This method requires visitorCode and goalID to track conversion on this particular goal. In addition, this method also accepts revenue as a third optional argument to track revenue. The visitorCode should be identical to the one that was used when triggering the experiment.

    The trackConversion() method doesn't return any value. This method is non-blocking as the server call is made asynchronously.

    Arguments
    NameTypeDescription
    visitorCodeStringUnique identifier of the user. This field is mandatory.
    goalIDIntID of the goal. This field is mandatory.
    revenueFloatRevenue of the conversion. This field is optional.
    Errors Thrown
    TypeDescription
    KameleoonError.sdkNotReadyError indicating that the SDK has not completed its initialization yet.
    KameleoonError.VisitorCodeNotValidError indicating that the provided visitor code is not valid (empty, or longer than 255 characters).

    addData

    kameleoonClient.addData(visitorCode : visitorCode, data : Interest(2))
    kameleoonClient.addData(visitorCode : visitorCode, data : Conversion(goalID : 32, revenue : 10.0, negative : false))
    

    To associate various data with the current user, we can use the addData() method. This method requires the visitorCode as a first parameter, and then accept several additional parameters. Those additional parameters represent the various Data Types allowed in Kameleoon.

    Note that the addData() method doesn't return any value and doesn't interact with the Kameleoon back-end servers by itself. Instead, every data declared is saved for further sending via the flush() method described in the next paragraph. This allows a minimal number of server calls to be made, as data are usually regrouped in a single server call triggered by the execution of flush().

    Arguments
    NameTypeDescription
    visitorCodeStringUnique identifier of the user. This field is mandatory.
    dataDataone or more values conforming to the Data protocol which may be passed separated by a comma.
    Errors Thrown
    TypeDescription
    KameleoonError.sdkNotReadyError indicating that the SDK has not completed its initialization yet.
    KameleoonError.VisitorCodeNotValidError indicating that the provided visitor code is not valid (empty, or longer than 255 characters).

    flush

    let visitorCode = UUID().uuidString
    
    kameleoonClient.addData(visitorCode : visitorCode, data : Interest(2))
    kameleoonClient.addData(visitorCode : visitorCode, data : Conversion(goalID : 32, revenue : 10.0, negative : false))
    kameleoonClient.flush(visitorCode : visitorCode)
    

    Data associated with the current user via addData() method is not sent immediately to the server. It is stored and accumulated until it is sent automatically by the triggerExperiment() or trackConversion() methods, or manually by the flush() method. This allows the developer to exactly control when the data is flushed to our servers. For instance, if you call the addData() method a dozen times, it would be a waste of ressources to send data to the server after each addData() invocation. Just call flush() once at the end.

    The flush() method doesn't return any value. This method is non-blocking as the server call is made asynchronously.

    Arguments
    NameTypeDescription
    visitorCodeStringUnique identifier of the user. This field is mandatory.
    completionHandler((Bool) -> Void)?Callback object. This field is an optional. It is a lambda expression that will asynchronously get called with a Bool argument representing whether the flush() call succeeded or not.
    Errors Thrown
    TypeDescription
    KameleoonError.sdkNotReadyError indicating that the SDK has not completed its initialization yet.
    KameleoonError.VisitorCodeNotValidError indicating that the provided visitor code is not valid (empty, or longer than 255 characters).

    Data

    Conversion

    try? kameleoonClient.addData(visitorCode : visitorCode, data : Conversion(goalID : 32, revenue : 10.0, negative : false))
    
    NameTypeDescription
    goalIDStringID of the goal. This field is mandatory.
    revenueFloatConversion revenue. This field is optional.
    negativeBoolDefines if the revenue is positive or negative. This field is optional.

    CustomData

    try? kameleoonClient.addData(visitorCode : visitorCode, data : CustomData(id : 1, value : "some custom value"))
    
    NameTypeDescription
    indexIntIndex / ID of the custom data to be stored. This field is mandatory.
    valueStringValue of the custom data to be stored. This field is mandatory.

    Interest

    try? kameleoonClient.addData(visitorCode : visitorCode, data : Interest(2))
    
    NameTypeDescription
    indexIntIndex / ID of the interest. This field is mandatory.