SDK integration with SwiftUI

This guide shows how to request user consent information through a consent form, and then checking for user consent when requesting ads with the User Messaging Platform (UMP) SDK in a SwiftUI app.

Prerequisites

• Read the Get Started guide.

Request for consent information

You should request an update of the user's consent information at every app launch, using requestConsentInfoUpdateWithParameters:completionHandler:. This determines whether your user needs to provide consent if they haven't done so already, or if their consent has expired.

Here is an example of how to check the status from a View in the onAppear(perform:) method.

struct ContentView: View {
  @State private var hasViewAppeared = false

  var body: some View {
    VStack {
      ...
    }
    .onAppear {
      // Gather consent only the first time the view appears.
      guard !hasViewAppeared else { return }
      hasViewAppeared = true

      // Create a UMPRequestParameters object.
      let parameters = UMPRequestParameters()
      // Set tag for under age of consent. false means users are not under age
      // of consent.
      parameters.tagForUnderAgeOfConsent = false

      // Request an update for the consent information.
      UMPConsentInformation.sharedInstance.requestConsentInfoUpdate(with: parameters) {
         (requestConsentError) in

        if let consentError = requestConsentError {
          // Consent gathering failed.
          return print("Error: \(consentError.localizedDescription)")
        }

        // TODO: Load and present the consent form.
      }
    }
  }
}

Warning: Using other ways of checking consent status, such as the cache on your app or a previously saved consent string, could lead to a TCF 3.3 error if consent is expired.

Load and present a consent form if required

Important: The following APIs are compatible with UMP SDK version 2.1.0 or higher.

After you've received the most up-to-date consent status, call loadAndPresentIfRequiredFromViewController:completionHandler: on the UMPConsentForm class to load a consent form. If the consent status is required, the SDK loads a form and immediately presents it from the provided view controller. The completion handler is called after the form is dismissed. If consent is not required, the completion handler is called immediately.

Create a UIViewControllerRepresentable

Because loadAndPresentIfRequiredFromViewController:completionHandler: requires a UIViewController object, create a type that conforms to the UIViewControllerRepresentable protocol. Its primary job is to expose a UIViewController reference to access in SwiftUI.

struct FormViewControllerRepresentable: UIViewControllerRepresentable {
  let viewController = UIViewController()

  func makeUIViewController(context: Context) -> some UIViewController {
    return viewController
  }

  func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {}
}

Your ViewControllerRepresentable type shouldn't have any significance to the content on screen, but still needs to be added to the view hierarchy. Add it within the view modifier background(alignment:content:) so it doesn't take up screen real estate.

struct ContentView: View {
  @State private var hasViewAppeared = false
  private let formViewControllerRepresentable = FormViewControllerRepresentable()

  var body: some View {
    VStack {
      ...
    }
    .background {
      // Add the ViewControllerRepresentable to the background so it
      // doesn't influence the placement of other views in the view hierarchy.
      formViewControllerRepresentable
        .frame(width: .zero, height: .zero)
    }
    .onAppear {
      // Gather consent only the first time the view appears.
      guard !hasViewAppeared else { return }
      hasViewAppeared = true

      // Create a UMPRequestParameters object.
      let parameters = UMPRequestParameters()
      // Set tag for under age of consent. false means users are not under age
      // of consent.
      parameters.tagForUnderAgeOfConsent = false

      // Request an update for the consent information.
      UMPConsentInformation.sharedInstance.requestConsentInfoUpdate(with: parameters) {
         (requestConsentError) in

        if let consentError = requestConsentError {
          // Consent gathering failed.
          return print("Error: \(consentError.localizedDescription)")
        }

        UMPConsentForm.loadAndPresentIfRequired(from:
            formViewControllerRepresentable.viewController) { loadAndPresentError in

          if let consentError = loadAndPresentError {
            // Consent gathering failed.
            return print("Error: \(consentError.localizedDescription)")
          }

          // Consent gathering completed.
        }
      }
    }
  }
}

Request ads

Before requesting ads in your app, check if you've obtained consent from the user using UMPConsentInformation.sharedInstance.canRequestAds. There are two instances to check while gathering consent:

1. After consent has been gathered in the current session.
2. Immediately after you've called requestConsentInfoUpdateWithParameters:completionHandler:.

It's possible that consent was obtained in a previous session. As a latency best practice, we recommend not waiting for the callback to complete so you can start loading ads as soon as possible after your app launches.

Key Point: UMPConsentInformation.sharedInstance.canRequestAds always returns false until after you've called requestConsentInfoUpdateWithParameters:completionHandler:.

If an error occurs during the consent gathering process, you should still attempt to request ads. The UMP SDK uses the consent status from the previous session.

struct ContentView: View {
  @State private var isMobileAdsStartCalled = false
  @State private var hasViewAppeared = false
  private let formViewControllerRepresentable = FormViewControllerRepresentable()

  var body: some View {
    VStack {
      ...
    }
    .background {
      // Add the ViewControllerRepresentable to the background so it
      // doesn't influence the placement of other views in the view hierarchy.
      formViewControllerRepresentable
        .frame(width: .zero, height: .zero)
    }
    .onAppear {
      // Gather consent only the first time the view appears.
      guard !hasViewAppeared else { return }
      hasViewAppeared = true

      // Create a UMPRequestParameters object.
      let parameters = UMPRequestParameters()
      // Set tag for under age of consent. false means users are not under age
      // of consent.
      parameters.tagForUnderAgeOfConsent = false

      // Request an update for the consent information.
      UMPConsentInformation.sharedInstance.requestConsentInfoUpdate(with: parameters) {
         requestConsentError in

        if let consentError = requestConsentError {
          // Consent gathering failed.
          return print("Error: \(consentError.localizedDescription)")
        }

        UMPConsentForm.loadAndPresentIfRequired(from:
            formViewControllerRepresentable.viewController) { (loadAndPresentError) in

          if let consentError = loadAndPresentError {
            // Consent gathering failed.
            return print("Error: \(consentError.localizedDescription)")
          }

          // Consent gathering completed.
          if UMPConsentInformation.sharedInstance.canRequestAds {
            startGoogleMobileAdsSDK()
          }
        }
      }

      // Check if you can initialize the Google Mobile Ads SDK in parallel
      // while checking for new consent information. Consent obtained in
      // the previous session can be used to request ads.
      if UMPConsentInformation.sharedInstance.canRequestAds {
        startGoogleMobileAdsSDK()
      }
    }
  }

  private func startGoogleMobileAdsSDK() {
    guard !isMobileAdsStartCalled else { return }

    isMobileAdsStartCalled = true

    // Initialize the Google Mobile Ads SDK.
    GADMobileAds.sharedInstance().start()

    // TODO: Request an ad.
    // GADInterstitialAd.load(...)
  }
}