ApplePurchaseService - GetPrices

ApplePurchaseService.cs

public class ApplePurchaseService : PurchaseService
{
    public async override Task<Purchase[]> GetPrices(params string[] ids)
    {
        using (var del = new RequestDelegate())
        using (var request = new SKProductsRequest(new NSSet(ids))
        {
            Delegate = del,
        })
        {
            request.Start();
            return await del.Source.Task;
        }
    }
    
    private class RequestDelegate : SKProductsRequestDelegate
    {
        private readonly NSNumberFormatter _formatter = new NSNumberFormatter
        {
            FormatterBehavior = NSNumberFormatterBehavior.Version_10_4,
            NumberStyle = NSNumberFormatterStyle.Currency,
        };

        public readonly TaskCompletionSource<Purchase[]> Source = new TaskCompletionSource<Purchase[]>();

        public override void ReceivedResponse(SKProductsRequest request, SKProductsResponse response)
        {
            if (response.Products == null || response.Products.Length == 0)
            {
                Source.TrySetException(new Exception("No products were found!"));
                return;
            }

            var list = new List<Purchase>();
            foreach (var product in response.Products)
            {
                list.Add(new Purchase
                {
                    Id = product.ProductIdentifier,
                    Price = _formatter.StringFromNumber(product.Price),
                    NativeObject = product,
                });
            }
            Source.TrySetResult(list.ToArray());
        }

        public override void RequestFailed(SKRequest request, NSError error)
        {
            Source.TrySetException(new Exception(error?.LocalizedDescription ?? "Unknown Error"));
        }
    }
}