Get notified when receipt has physically finished printing

link-os SDK for iOS 1.4.957

Zebra iMZ220

 

I am currently using ZebraPrinterConnection's write:error to print receipts.

 

Is there a different approach that would inform me when the receipt has physically finished printing?  I think write:error just tells me if the write completed successfully and/or if it had an error.

 

Thanks,

Del