---
title: numberOfBytesTransferred
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avplayeritemaccesslogevent/numberofbytestransferred
---

# numberOfBytesTransferred

The accumulated number of bytes transferred by the item.

## Declaration

```swift
var numberOfBytesTransferred: Int64 { get }
```

## Discussion

Discussion The property corresponds to “bytes”. The value of this property is negative if unknown. This property is not compatible with key-value observing.

## See Also

### Getting server-related log events

- [uri](avfoundation/avplayeritemaccesslogevent/uri.md)
- [serverAddress](avfoundation/avplayeritemaccesslogevent/serveraddress.md)
- [numberOfServerAddressChanges](avfoundation/avplayeritemaccesslogevent/numberofserveraddresschanges.md)
- [mediaRequestsWWAN](avfoundation/avplayeritemaccesslogevent/mediarequestswwan.md)
- [transferDuration](avfoundation/avplayeritemaccesslogevent/transferduration.md)
- [numberOfMediaRequests](avfoundation/avplayeritemaccesslogevent/numberofmediarequests.md)