initial commit, iOS network native library

Network/Platforms/iOS/Tasks/DownloadTask.cs

@@ -0,0 +1,30 @@
+using Foundation;
+
+namespace Blahblah.Library.Network;
+
+public class DownloadTask<T> : ContentTask<T, bool>
+{
+    public string FilePath { get; }
+
+    protected override bool AllowDefaultResult => true;
+
+    public DownloadTask(string url, string filePath, TaskCompletionSource<NetworkResult<bool>> source, CancellationToken token) : base(url, source, token)
+    {
+        FilePath = filePath;
+    }
+
+    protected override bool Completed(NSHttpUrlResponse? response)
+    {
+        if (Data == null)
+        {
+            throw new NullReferenceException("Data is null");
+        }
+        var result = Data.Save(FilePath, NSDataWritingOptions.Atomic, out NSError? error);
+        if (error != null)
+        {
+            throw new Exception(error?.ToString() ?? "UUnknown error while saving file");
+        }
+        return result;
+    }
+}
+