Track events

Events represent things people do in your app, website, etc, so that you can track your audience’s activity and metrics. Use events to segment your audience, trigger campaigns, and capture usage metrics in your app.

This page is part of an introductory series to help you get started with the essential features of our SDK. The highlighted step(s) below are covered on this page. Before you continue, make sure you've implemented previous features—i.e. you can't identify people before you initialize the SDK!

graph LR getting-started(Install SDK) -->B(Initialize SDK) B --> identify(identify people) identify -.-> track-events(Send events) identify -.-> push(Receive push) identify -.-> rich-push(Receive Rich Push) track-events --> test-support(Write tests) push --> test-support rich-push --> test-support click getting-started href "/docs/sdk/ios/getting-started" click B href "/docs/sdk/ios/getting-started/#initialize-the-sdk" click identify href "/docs/sdk/ios/identify" click track-events href "/docs/sdk/ios/track-events/" click push href "/docs/sdk/ios/push" click rich-push href "/docs/sdk/ios/rich-push" click test-support href "/docs/sdk/ios/test-support" style track-events fill:#B5FFEF,stroke:#007069

Track a custom event

After you identify a person, you can use the track method to send events representing their activities to When you send events, you can include event data—information about the person or the event that they performed.

In, you can use events to trigger campaigns and broadcasts. Those campaigns might send someone a push notification or manipulate information associated with the person in your workspace.

Events include the following:

import CioTracking

CustomerIO.shared.track(name: "logged_in", data: ["ip": ""])

// The `data` parameter can be optionally skipped
CustomerIO.shared.track(name: "played_game")
// `data` accepts [String: Any] or an `Encodable` object 
// 1. [String: Any]:
let data = ["product": "socks", "price": "23.45"]
CustomerIO.shared.track(name: "purchase", data: data)

// 2. A custom `Encodable` type:
struct Purchase: Encodable {
  let product: String
  let price: Double
CustomerIO.shared.track(name: "purchase", data: Purchase(product: "socks", price: 23.45))

Screen view events

Screen views are events that record the pages that your audience visits in your app. They have a type property set to screen, and a name representing the title of the screen or page that a person visited in your app.

Screen view events let you trigger campaignsA series of actions that you perform for each person who matches criteria. Campaigns typically send people a series of messages, but you can also use campaigns to send webhooks, update attributes, etc. or add people to segmentsA group of people who match a series of conditions. People enter and exit the segment automatically when they match or stop matching conditions. based on the parts of your app your audience uses. Screen view events also update your audience’s “Last Visited” attribute, which can help you track how recently people used your app.

Enable automatic screen tracking

When you enable automatic screen tracking, the SDK sends an event every time a person visits a screen in your app. You can turn on automatic screen tracking in CustomerIO.config.

CustomerIO.config {
  $0.autoTrackScreenViews = true
  // Optional configuration where you can modify the `data` being sent for 
  // automatic screenview events. 
  $0.autoScreenViewBody = {
    return ["seconds_on_screen": SecondsOnScreenManager.getTimeInScreen()]

For automatic screenview tracking, the SDK automatically names the screen as the class name of the UIViewController, minus ViewController. For example, if you have a class EditProfileViewController in your code base, the SDK will automatically send a screenview event with the screen name EditProfile.

If you want to send more data with screen events, or you don’t want to send events for every individual screen that people view in your app, you can disable automatic screen tracking and send screen events manually.

Send your own screen events

Screen events use the .screen method. Like other event types, you can add a data object containing additional information about the event or the currently-identified person.

import CioTracking

// You can send an event with or without `data`.
CustomerIO.shared.screen(name: "BaseballDailyScores")
// `data` accepts [String: Any] or an `Encodable` object 
// 1. [String: Any]:
let data = ["prev_screen": "homescreen", "seconds_in_app": "120"]
CustomerIO.shared.screen(name: "BaseballDailyScores", data: data)

// 2. A custom `Encodable` type:
struct Screen: Encodable {
  let prevScreen: String
  let secondsInApp: Int
CustomerIO.shared.screen(name: "BaseballDailyScores", data: Screen(prevScreen: "homescreen", secondsInApp: 120))
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