UMP Dialog fails to open in "add to app" scenario

[rckrd-proguitar]

The UMP dialog fails to open on iOS when the plugin is running in a Flutter module.

This is the same issue described in Issue #700, but it specifically affects the User Messaging Platform (UMP) dialog. When the UMP dialog is loaded and show is called, the plugin attempts to use the rootViewController. However, since Flutter is running as a module in a view controller that was pushed by the root view controller, the root view controller is no longer on top. As a result, it cannot present a new view controller.

The fix should be the same as the one used in Issue #700.

Here is the bug: (using a view controller that is not on top):
https://github.com/googleads/googleads-mobile-flutter/blob/main/packages/google_mobile_ads/ios/Classes/UserMessagingPlatform/FLTUserMessagingPlatformManager.m#L47

Error message:

"The provided view controller is already presenting another view controller"

Proposed fix (make sure to use the topmost view controller also for UMP dialogs):
https://github.com/googleads/googleads-mobile-flutter/blob/main/packages/google_mobile_ads/ios/Classes/FLTGoogleMobileAdsPlugin.m#L228

[malandr2]

Hi @rckrd-proguitar thank you for flagging this. Before we make a fix, can you share a video or something reproducible of the issue you're encountering? To confirm the issue. Thanks.

[rckrd-proguitar]

Hi @malandr2,

I've updated the MCVE for issue #700 to also demonstrate the problem with the UMP dialog:
https://github.com/rckrd-proguitar/googleads-mobile-flutter-issue-700

Here's a video of a run session using the example:
https://drive.google.com/file/d/1A9SPuxf-Esip6GZEwZP5YAP7me-atLil/view?usp=drive_link

As you can see, the UMP dialog does not appear. Instead, we encounter the following error:
"The provided view controller is already presenting another view controller."

[malandr2]

Thanks @rckrd-proguitar, I've shared this with @LTPhantom to take a closer look.