The feature allows marketers to track downloads that originate from “in-app” display ads, meaning the iOS conversion tracking feature at this point doesn’t include app downloads driven by Google Search or Google Display Network ads. For iOS app downloads, Google explained marketers will have to go through a couple extra steps, requiring them install an SDK, grab a code snippet from their AdWords account, and then install it into their app. The same feature is currently available to Android as a codeless solution requiring users to simply create a new conversion in their account.
Tracking downloads of an iOS app requires integrating a small SDK into your app and pasting a small snippet of code in your app’s didFinishLaunchingWithOptions method to call the SDK.
Full instructions from Google on setting up iOS conversion tracking are below: expand full story