Task BeginQuery()
{
if (firstQueryResult != null)
{
var t = firstQueryResult;
firstQueryResult = null;
if (!t.Task.IsCompleted)
{
t.SetException(new Exception("Stopped"));
}
}
if (query != null)
{
query.StopQuery();
}
firstQueryResult = new TaskCompletionSource <object> ();
if (documentsUrl == null)
{
firstQueryResult.SetResult(null);
return(firstQueryResult.Task);
}
var queryString = "";
var head = "";
var args = new List <NSObject> ();
foreach (var e in FileExtensions)
{
queryString += head + "(%K LIKE '*." + e + "')";
head = " OR ";
args.Add(NSMetadataQuery.ItemFSNameKey);
}
query = new NSMetadataQuery();
query.SearchScopes = new NSObject[] { NSMetadataQuery.UbiquitousDocumentsScope };
query.Predicate = NSPredicate.FromFormat(
queryString,
args.ToArray());
Console.WriteLine("START iCLOUD QUERY");
query.StartQuery();
needsRefresh = false;
return(firstQueryResult.Task);
}
void StartQuery()
{
if (documentMetadataQuery != null)
{
documentMetadataQuery.StopQuery();
}
if (AppConfig.SharedAppConfiguration.StorageOption == StorageType.Cloud)
{
StartMetadataQuery();
}
else
{
StartLocalQuery();
}
}
public override void WillTerminate(NSNotification notification)
{
_query.StopQuery();
_query.Delegate = null;
_query = null;
}