Xamarin iOS Center TableViewCell Subview - ios

Question

I´m using the NuGet-Package iCarousel as a Subview in UITableViewCell.
Here is my code where I add the iCarousel object (this code is located in the ViewDidLoad method of my parent ViewController):
InvokeOnMainThread(async() =>
{
items = await ppCtrl.GetAllPerpetrationPartIds(masterProject.Id).ConfigureAwait(false);
if (items != null && items.Any())
{
InvokeOnMainThread(() =>
{
var carousel = new iCarousel
{
Bounds = CarouselViewCell.ContentView.Bounds,
ContentMode = UIViewContentMode.Center,
Type = iCarouselType.CoverFlow2,
Frame = CarouselViewCell.ContentView.Frame,
CenterItemWhenSelected = true,
DataSource = new SimpleDataSource(items, CarouselViewCell.ContentView.Bounds.Width, CarouselViewCell.ContentView.Bounds.Height),
Delegate = new SimpleDelegate(this)
};
NSLayoutConstraint centerX = carousel.CenterXAnchor.ConstraintEqualTo(this.CarouselViewCell.ContentView.CenterXAnchor);
NSLayoutConstraint centerY = carousel.CenterYAnchor.ConstraintEqualTo(this.CarouselViewCell.ContentView.CenterYAnchor);
centerX.SetIdentifier("centerXCostraint");
centerY.SetIdentifier("centerYConstraint");
var centerConstraints = new[] {centerX, centerY };
CarouselViewCell.ContentView.TranslatesAutoresizingMaskIntoConstraints = false;
CarouselViewCell.ContentView.AddConstraints(centerConstraints);
//NSLayoutConstraint.ActivateConstraints(centerConstraints);
CarouselViewCell.ContentView.ContentMode = UIViewContentMode.Center;
CarouselViewCell.ContentView.AddSubview(carousel);
ViewDidLayoutSubviews();
});
}
});
Now I want to vertically and horizontally center the iCarousel. So I added this code:
NSLayoutConstraint centerX = carousel.CenterXAnchor.ConstraintEqualTo(this.CarouselViewCell.ContentView.CenterXAnchor);
NSLayoutConstraint centerY = carousel.CenterYAnchor.ConstraintEqualTo(this.CarouselViewCell.ContentView.CenterYAnchor);
centerX.SetIdentifier("centerXCostraint");
centerY.SetIdentifier("centerYConstraint");
var centerConstraints = new[] {centerX, centerY };
CarouselViewCell.ContentView.TranslatesAutoresizingMaskIntoConstraints = false;
CarouselViewCell.ContentView.AddConstraints(centerConstraints);
My problem is now that the app Crashes at this line:
CarouselViewCell.ContentView.AddConstraints(centerConstraints);
I found in a similar post that you need to add the constraints to the assiciated UIView object. I tried several objects but with no success.

Answer 1

CarouselViewCell.ContentView.AddConstraints(centerConstraints);
This code will crash because we need to add the control first, then set its constraints. Or it will crash. Try to adjust the code's order:
//Let this code just lie after the carousel's construction.
CarouselViewCell.ContentView.AddSubview(carousel);
Also if you want to add the carousel's constraints, you should set the carousel's TranslatesAutoresizingMaskIntoConstraints to false not CarouselViewCell.ContentView.
Moreover depending on your description, I think you want to put an iCarousel on UITableViewCell. This configuration should be set in the Cell class not in the parent ViewController class.