Native embedded CollectionView is twice the screen width on iOS

[JRosanowski]

I'm using a CollectionView (ListView has the same issue) in a custom ContentView in a ContentPage that is natively embedded in a ViewController and when it's displayed on iOS I can only see half of it. The other half is off the right hand side of the screen. I've got another embedded CollectionView in a separate ViewController that is set up similarly and is fine on iOS.

Both of them appear perfectly on Android which is natively embedding them into an Activity.

Does anyone have any ideas what might be causing this problem on iOS?

[JRosanowski]

It was actually an issue with my embedding code. I wasn't setting the frame of the ViewController created from the ContentPage.

public override void ViewDidLoad()
{
 base.ViewDidLoad();
   
 MyPage page = new();
 _pageViewController = page.ToUIViewController(AppDelegate.MauiContext);
 AddChildViewController(_pageViewController);
 View.AddSubview(_pageViewController.View);
 pageViewController.DidMoveToParentViewController(this);
}

public override void ViewDidLayoutSubviews()
 {
   base.ViewDidLayoutSubviews();
   // *** Must set the frame!!!
   _pageViewController.View.Frame = new CGRect(0, 0, View.Frame.Width, View.Frame.Height);
 }