Instance Method

urlSession(_:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:)

Periodically informs the delegate of the progress of sending body content to the server.

Declaration

optional func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64)

Parameters

session

The session containing the data task.

task

The data task.

bytesSent

The number of bytes sent since the last time this delegate method was called.

totalBytesSent

The total number of bytes sent so far.

totalBytesExpectedToSend

The expected length of the body data. The URL loading system can determine the length of the upload data in three ways:

  • From the length of the NSData object provided as the upload body.

  • From the length of the file on disk provided as the upload body of an upload task (not a download task).

  • From the Content-Length in the request object, if you explicitly set it.

Otherwise, the value is NSURLSessionTransferSizeUnknown (-1) if you provided a stream or body data object, or zero (0) if you did not.