/// <summary>
/// Observe a file transfer, hold the observation.
/// </summary>
public void Observe(WCSessionFileTransfer fileTransfer, Action <NSProgress> handler)
{
var observation = fileTransfer.Progress.AddObserver("fractionCompleted", NSKeyValueObservingOptions.New, (_) =>
{
handler(fileTransfer.Progress);
});
this.observations.Add(observation);
this.fileTransfers.Add(fileTransfer);
}
/// <summary>
/// Unobserve a file transfer, invalidate the observation.
/// </summary>
public void Unobserve(WCSessionFileTransfer fileTransfer)
{
var index = this.fileTransfers.IndexOf(fileTransfer);
if (index != -1)
{
var observation = this.observations[index];
observation.Dispose();
this.observations.RemoveAt(index);
this.fileTransfers.RemoveAt(index);
}
}
/// <summary>
/// Log the file transfer progress.
/// </summary>
private void LogProgress(WCSessionFileTransfer fileTransfer)
{
DispatchQueue.MainQueue.DispatchAsync(() =>
{
var dateFormatter = new NSDateFormatter {
TimeStyle = NSDateFormatterStyle.Medium
};
var timeString = dateFormatter.StringFor(new NSDate());
var fileName = fileTransfer.File.FileUrl.LastPathComponent;
var progress = fileTransfer.Progress.LocalizedDescription ?? "No progress";
this.Log($"- {fileName}: {progress} at {timeString}");
});
}
