Embedded Messages with Iterable's iOS SDK

This article describes the steps you'll need to follow to use Iterable's iOS SDK to display embedded messages in your mobile app.

This document describes the necessary steps only to use embedded messaging. To learn about more SDK options, read Iterable's iOS SDK.

# In this article

# Step 1: Coordinate with your marketing and design teams

First, collaborate with your marketing and design teams to determine:

• Where you'll display embedded messages in your apps (where your placements go).
• Each placement's Iterable-assigned numeric ID (so you can display the right messages in the right places).
• The data to display in each placement's messages. This determines what fields your app will expect to find in an embedded message payload.
• The message design for each of your placements.

# Step 2: Create a Mobile API key

To use Iterable's iOS SDK to display embedded messages, you'll need a mobile API key. To learn how to create one, read Creating API keys

# Step 3: Install Iterable's iOS SDK in your app

To learn how to install Iterable's iOS SDK in your app, read Install the SDK. Embedded Messaging is supported by versions 6.5.0+ of Iterable's iOS SDK.

# Step 4: Configure the SDK

Next, configure the SDK, specify a URL handler and a custom action handler, enable embedded messaging, set allowed URL protocols, initialize the SDK with an API key, and identify the user.

For example:

let config = IterableConfig()
config.urlDelegate = self
config.customActionDelegate = self
config.enableEmbeddedMessaging = true
// Specify the URL schemes you're expecting to receive in the campaigns you 
// send with Iterable. The SDK passes URLs with these URL schemes to your URL 
// handler, which can then handle them as necessary. For example, if you 
// indicate that "mycompany" is an allowed protocol, the SDK will pass URLs 
// such as "mycompany://profile" to your URL handler, which can respond as
// needed. For example, for "mycompany://profile", it might deep link to 
// the app's user profile screen.
config.allowedProtocols = ["mycompany"]

IterableApi.initialize(apiKey: apiKey, config:config)

IterableAPI.email = email
// IterableAPI.userId = userId

# Step 4.1: Define a URL handler

In the example SDK configuration code above, notice that on IterableConfig, urlDelegate is set to an object that conforms to protocol IterableURLDelegate (in this case, self). The SDK uses the urlDelegate to handle two types of URLs:

• Standard URLs, such as https://example.com/product/123.
• URLs with allowed custom URL schemes, such as mycompany://profile. The SDK ignores URLs that use custom URL schemes not specified as allowed protocols on IterableConfig (see above).

When a user clicks a button or a link on an incoming message, and the click is associated with one of the two URL types listed above, the SDK passes that URL to the URL handler. Then, the URL handler can handle (or not handle) it as it makes sense. For example, it might open the link in a browser or open it as a deep link.

Your URL handler must conform to protocol IterableURLDelegate, which specifies a method for URL handling:

@objc(handleIterableURL:context:)
func handle(
    iterableURL url: URL, 
    inContext context: IterableActionContext
) -> Bool

This method should return true for URLs it can handle, and false for URLs it cannot handle.

When the URL handler can't handle a given URL, the SDK checks for another installed app that can handle that URL (for example, a web browser). If there are no other apps that can handle the URL, the SDK does nothing.

Here's an example implementation:

func handle(iterableURL url: URL, inContext _: IterableActionContext) -> Bool {
    let urlString = url.absoluteString
    // For example, urlString might be: "mycompany://profile"
    if(urlString.contains("mycompany://profile")) {
        // Navigate the user to the profile page...
        return true
    }
    return false
}

In this sample, handle reponds to mycompany://profile URLs by navigating the user to the user profile screen. Then, it returns true to indicate that it handled the URL.

Implementations of this method will vary, depending on your app architecture and the URLs you need to handle. However, it's important to remember that this method is shared across message mediums. Make sure to handle URLs you might receive from any message type, not just embedded messages.

# Step 4.2: Define a custom action handler

Custom actions represent custom functionality you'd like your app to execute — maybe a deep link, a style update, or another behavior of some kind. Custom actions use the action:// URL scheme.

Similar to your URL handler, the object specified on IterableConfig as your customActionDelegate serves as your app's central handler for custom actions. When a user clicks a button or a link associated with a custom action, this action is passed to your custom action handler, where you can deal with it however necessary (usually by executing custom functionality of some kind).

Your custom action handler must conform to protocol IterableCustomActionDelegate, which specifies a method for custom action handling:

@objc(handleIterableCustomAction:context:)
func handle(iterableCustomAction action: IterableAction, inContext context: IterableActionContext) -> Bool

This method should return true when it can handle the custom action URL, and false when it cannot. When it returns false, the custom action is dropped — since custom actions are special, non-standard URLs, they cannot be opened by a web browser.

For example, here's a sample custom action handler that handles an action://joinClass/1 URL:

func handle(iterableCustomAction action: IterableAction, inContext context: IterableActionContext) -> Bool {
    // The custom action's full URL is stored in action.type
    if (action.type.contains("joinClass")) {
        // Sign the user up for a class ...
        return true
    }
    return true
}

Implementations of this method will vary. However, be sure to account for any specific custom actions you'll send to your app (in an embedded message, or in any other kind of message).

# Step 5: Enable support for push notifications in your app

To alert your app when the signed-in user's embedded message eligibility changes (that is, when they are newly eligible, or no longer eligible, for some embedded message campaign in your project), Iterable sends silent push notifications.

After receiving one of these silent push notifications, the SDK refreshes its local cache of embedded messages by re-fetching them from Iterable's API.

To learn how to enable push notifications in your iOS app, read Enable Push Notifications.

# Step 6: Fetch embedded messages from Iterable

When your app first launches, and each time it comes to the foreground, Iterable's iOS SDK automatically refresh a local, on-device cache of embedded messages for the signed-in user. These are the messages the signed-in user is eligible to see.

At key points during your app's lifecycle, you may want to manually refresh your app's local cache of embedded messages. For example, as users navigate around, on pull-to-refresh, etc.

To refresh the local cache of embedded messages, call:

IterableApi.getInstance().embeddedManager.syncMessages() { }

However, do not poll for new embedded messages at a regular interval.

To fetch embedded messages, Iterable's iOS SDK calls:

GET /api/embedded-messaging/messages

# Step 7: Track message receipt

For each embedded message received from Iterable, Iterable's iOS SDK automatically tracks an embeddedReceived event. Each of these events represents the download of a particular message to a particular device — but not, necessarily, that the message was displayed or seen by the user.

To track message receipt, Iterable's iOS SDK calls:

POST /api/embedded-messaging/events/received

# Step 8: Set up SDK listeners

Now, set up listeners for the SDK to call when new embedded messages arrive on device, to tell your views to display messages as needed. To add these listeners, call the following methods on IterableEmbeddedManager:

public func addUpdateListener(_ listener: IterableEmbeddedUpdateDelegate)
public func removeUpdateListener(_ listener: IterableEmbeddedUpdateDelegate)

Typically, a view that displays embedded messages adds itself as a listener when it appears, and removes itself as a listener when it disappears. For example, on a view controller:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    IterableAPI.embeddedManager.addUpdateListener(self)
    // ...
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    IterableAPI.embeddedManager.removeUpdateListener(self)
    // ...
}

IterableEmbeddedUpdateDelegate, the protocol to which listeners must conform, declares these methods:

• func onMessagesUpdated() – Called by the SDK to tell your app that embedded messages have been updated, and that you can grab the local queue and display them.

• func onEmbeddedMessagingDisabled() – Called by the SDK when there's a failure fetching embedded messages from the server. Use this method to hide your embedded message display or show default content, as needed.

For example, a view registered as a listener might have an onMessagesUpdated implementation such as:

func onMessagesUpdated() {
    // Fetch messages for the placement associated with the current view
    let embeddedMessages = IterableAPI.embeddedManager.getMessages(for:placementId)

    // Show or hide messages...
    // ...
}

# Step 9: Display embedded messages

For each incoming embedded message, create a view and add it to your app's user interface, using the fields included in the message to populate the message content and set its styles. For example, you might use one IterableEmbeddedMessage to drive the creation of a single banner message, or many of them to drive the creation of a carousel.

As you're setting up your embedded message views:

• Associate each message view with its corresponding IterableEmbeddedMessage object, so you have access to the underlying message (and its messageId) when tracking events.
• Add click handlers where necessary, so you can handle clicks and track them in Iterable. As messages appear and disappear, track impressions (described in the next section).

IterableEmbeddedMessage objects have various fields, corresponding to the data included with your campaign:

• metadata – Identifying information about the campaign.

  • messageId – The ID of the message.
  • placementId – The ID of the placement associated with the message.
  • campaignId – The ID of the campaign associated with the message.
  • isProof – Whether or not the campaign is a test message.

• elements – What to display, and how to handle interaction.

  • title – The message's title text.
  • body – The message's body text.
  • mediaUrl – The URL of an image associated with the message.
  • mediaUrlCaption – Text description of the image.
  • defaultAction – What to do when a user clicks on the message (outside of its buttons).
  • buttons – Buttons to display.
  • text – Extra data fields. Not for display.

• payload – Custom JSON data included with the campaign.

Use this data to build a custom view. Or use one the out-of-the-box views provided by the SDK, as described below.

# Out-of-the-box views

Iterable's iOS SDK provides an IterableEmbeddedView class you can use to display embedded messages as a card, a banner, or a notification. For more information about out-of-the-box views, read Out-of-the-Box Views for Embedded Messages.

You can customize out-of-the-box views, in some ways, to more closely match the styles of your apps.

Out-of-the-box views handle clicks, too. To do this, they automatically:

• Pass URLs and custom actions to the URL and custom action handlers you set up in step 4.
• Track embeddedClick events.

To use an out-of-the-box view, first create an IterableEmbeddedViewConfig object, to declare the styles you'd like the view to use:

// Grab your app's colors from wherever it makes sense.
let config = IterableEmbeddedViewConfig(
    backgroundColor: UIColor.white, 
    borderColor: UIColor.purple, 
    borderWidth: 1.0, 
    borderCornerRadius: 8.0, 
    primaryBtnBackgroundColor: UIColor.purple, 
    primaryBtnTextColor: UIColor.white, 
    secondaryBtnBackgroundColor: UIColor.white, 
    secondaryBtnTextColor: UIColor.purple, 
    titleTextColor: UIColor.black, 
    bodyTextColor: UIColor.black
)

Then, when it's time to display a message, create the IterableEmbeddedView:

let iterableEmbeddedView = IterableEmbeddedView(
    message: message,
    viewType: viewType,
    config: emViewConfig
)

This initializer takes three parameters:

• The IterableEmbeddedMessage to display.
• A value of type IterableEmbeddedViewType, an enum with three cases:
  • banner
  • card
  • notification
• The IterableEmbeddedViewConfig created above.

Then, add the view to your layout. It's important to fully specify the size of the view, with minimum dimensions as described in Out-of-the-Box Views for Embedded Messages.

For example, this code, in an iOS view controller, creates an IterableEmbeddedView. Then, after adding it to the current view, it specifies constraints, indicating how the out-of-the-box view should fit in the screen's overall layout:

let iterableEmbeddedView = IterableEmbeddedView(message:embeddedMessage, viewType:IterableEmbeddedViewType.card, config:config)
iterableEmbeddedView?.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(iterableEmbeddedView!)
NSLayoutConstraint.activate([
    iterableEmbeddedView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
    iterableEmbeddedView.leadingAnchor.constraint(equalTo: view.leadingAnchor), constant: 10),
    iterableEmbeddedView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 10),
    iterableEmbeddedView.heightAnchor.constraint(equalToConstant: 300)
])

This is just an example. The specific approach you'll take when adding an out-of-the-box view to your app depends on your app architecture.

# Step 10: Track sessions and impression

A session is a period of time when a user is on a screen or page that can display embedded messages.

Every session can have many impressions. An impression represents the on-screen appearances of a given embedded message, in context of a session. Each impression tracks:

• The total number of times a message appears during a session.
• The total amount of time that message was visible, across all its appearances in the session.

To help you track message sessions and impressions (views of a message), Iterable's iOS SDK provides a session manager. Sessions and impressions are tracked in Iterable as embeddedSession and embeddedImpression events.

# Step 10.1: Start a session

When a user comes to a screen or page in your app where embedded messages are displayed (in one or more placements), use the session manager to start a session. To start a session, call:

// When the screen that displays your embedded message is displayed or comes to
// the foreground
EmbeddedSessionManager.shared.startSession()

# Step 10.2: Start and pause impressions

As messages appear or disappear during an ongoing embedded message session, use the session manager to track message impressions.

The session manager tracks the total number of times each message appears during a session, and the total amount of time each message is on-screen across all those appearances. To start and pause impressions, call:

// When a message appears, start an impression (associating it with a placement)
EmbeddedSessionManager.shared.startImpression(
    messageId: embeddedMessage.metadata.messageId, 
    placementId: embeddedMessage.metadata.placementId 
)

// When a message disappears…
EmbeddedSessionManager.shared.pauseImpression(
    messageId: embeddedMessage.metadata.messageId
)

Be sure to start and pause impressions when your app goes to and from the background, too.

# Step 10.3: End the session, saving impression data to Iterable

When a user leaves a screen in your app where embedded messages are displayed, use the session manager to end the active session. This causes the SDK to send session and impression data back to the server.

To end a session, call:

// When a screen that displays embedded messages is dismissed 
// or goes to the background
EmbeddedSessionManager.shared.endSession()

To track sessions and impressions, Iterable's iOS SDK calls:

POST /api/embedded-messaging/events/session

# Step 11: Handle clicks

Finally, configure your app to handle clicks on embedded messages. When a user clicks a link or a button, it can be associated with:

• A standard URL (for example, https://example.com/products/1).
• A custom URL scheme (for example, mycompany://profile).
• A custom action (for example, action://joinClass/1).

Above, you set up a URL handler for handling standard URLs and custom URL schemes, and a custom action handler for handling custom action URLs.

Now, just listen for clicks, and then tell the SDK to invoke the URL or the custom action handler (depending on the type of URL that was clicked).

# Click handling for out-of-the-box views

If you're using an out-of-the-box view to display embedded messages, you can skip this step. Out-of-the-box views automatically:

• Pass standard URLs and URLs with allowed custom URL schemes to the URL handler you defined above. If your URL handler can't handle the URL (returns false), the SDK attempts to open it with another app that can handle it (for example, a web browser).
• Pass custom actions to your custom action handler. If your custom action handler can't handle the custom action (returns false), the custom action is dropped (since it can't be handled by a web browser).
• Track embeddedClick events.

# Click handling for custom embedded message views

If you're using a custom view to display an embedded message, you'll need to handle clicks. As you instantiate custom embedded message views in your iOS app:

• Add click handlers to the message's buttons (if the message has buttons), in whatever way makes sense for your app.
• Set up a default click handler, too, for general clicks on the message (outside of any specific button or link).

In your click handlers:

• Execute any necessary custom application logic (update the UI if needed, etc.).

• Call handleEmbeddedClick on IterableEmbeddedManager. This method forwards URLs and custom actions to the handlers you defined above. For example:

  IterableAPI.embeddedManager.handleEmbeddedClick(
      message: embeddedMessage,
      buttonIdentifier: buttonIdentifier
      clickedUrl: url
  )
  

• Track an embeddedClick event:

  IterableAPI.track(
      embeddedMessageClick: embeddedMessage,
      buttonIdentifier: buttonIdentifier
      clickedUrl: url
  )
  

  To track clicks, Iterable's iOS SDK calls:

  POST /api/embedded-messaging/events/click

# Want to learn more?

• Out-of-the-Box Views for Embedded Messages.
• The GitHub repository for Iterable's iOS SDK. In particular, these files:
  • IterableEmbeddedManager.swift
  • EmbeddedSessionManager.swift
  • IterableEmbeddedMessage.swift
  • IterableEmbeddedView.swift