Video ads often not start playing in SwiftUI

[mrbodich]

I have implemented Teads through SwiftUI.
Some video ads or scroll-to-animate ads are not starting playing most of view presentations if I scroll the list from the bottom.
I mean if the list was loaded with 0 offset and I scroll from the top, videos work well. But if the list was pre-scrolled at some deeper point, and I slowly scroll back to the top, the banner appears, the progress bar is progressing but no video.
If I return bannerView in one line of code directly in makeUIView(context:) and do nothing in updateUIView then it works like described.
If I set up the TeadsInReadAdView in the updateUIView(_ uiView:) it works in similar way, but what's the same is empty video when I scroll from the bottom (as I said, if the list was presented with immediately pre-defined offset deeper than the Teads Ad cell).

Scrolling from the bottom — Empty video
Scrolling from the top — Video exists and playing
As we see, the Ad UIView is presented successfully, we see the title and the progress bar.

In the attached code below:

The bannerView property which is passed here is coming from the Ads Loader.
More often it's passed from cache already pre-loaded, in the provided case I've tested pre-loaded, so the TeadsInReadAdView is available immediately when the SwiftUI view is presented.

I've tried a lot of variations, setting constraints manually or not, with all that layout methods called or no or variations.
It works more stable when I directly return bannerView in makeUIView(context:) but in some specific cases no.

@MainActor
struct TeadsBannerView: UIViewRepresentable {
    let bannerView: TeadsInReadAdView
    
    func makeUIView(context: Context) -> UIView {
        return UIView()
    }
    
    func updateUIView(_ uiView: UIView, context: Context) {
        uiView.addSubview(bannerView)
        bannerView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            bannerView.topAnchor.constraint(equalTo: uiView.topAnchor),
            bannerView.bottomAnchor.constraint(equalTo: uiView.bottomAnchor),
            bannerView.leadingAnchor.constraint(equalTo: uiView.leadingAnchor),
            bannerView.trailingAnchor.constraint(equalTo: uiView.trailingAnchor),
        ])
        bannerView.setNeedsLayout()
        bannerView.layoutIfNeeded()
        bannerView.layoutSubviews()
    }
}

// Another version
@MainActor
struct TeadsBannerView: UIViewRepresentable {
    let bannerView: TeadsInReadAdView
    
    func makeUIView(context: Context) -> TeadsInReadAdView {
        return bannerView
    }
    
    func updateUIView(_ uiView: TeadsInReadAdView, context: Context) { }
}

Have no idea how to solve that, maybe you can take a look and find the right direction?
I believe there is some issue in the TeadsInReadAdView life cycle, it is missing some update trigger when it should be triggered.

[github-lucas-bon]

Hello @mrbodich thanks for sharing it.
Could you provide the ad response (which you could get using Charles/Proxyman)? If possible provide a video as well of the issue happening.
What you mean with scroll-to-animate ads?
Do you have any animation in place when expanding the ad slot to display it?