Reference (Old Docs)
FBSDKGraphRequestConnectionDelegate
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The FBSDKGraphRequestConnectionDelegate protocol defines the methods used to receive network activity progress information from a FBSDKGraphRequestConnection.

Extends Protocol:NSObject
Declared in:FBSDKGraphRequestConnection.h
Instance Methods
requestConnection:didFailWithError:

Tells the delegate the request connection failed with an error

ParameterDescription
connection

The request connection that successfully completed a network request

error

The NSError representing the network error that occurred, if any. May be nil in some circumstances. Consult the NSError for the <FBSDKGraphRequest> for reliable failure information.

- (void)
requestConnection: (FBSDKGraphRequestConnection *)connection
didFailWithError: (NSError *)error;
Discussion:

If the request connection fails with a network error then this method is called. The error argument specifies why the network connection failed. The NSError object passed to the FBSDKGraphRequestHandler block may contain additional information.

Declared In: FBSDKGraphRequestConnection.h
requestConnection:didSendBodyData:totalBytesWritten:totalBytesExpectedToWrite:

Tells the delegate how much data has been sent and is planned to send to the remote host

ParameterDescription
connection

The request connection transmitting data to a remote host

bytesWritten

The number of bytes sent in the last transmission

totalBytesWritten

The total number of bytes sent to the remote host

totalBytesExpectedToWrite

The total number of bytes expected to send to the remote host

- (void)
requestConnection: (FBSDKGraphRequestConnection *)connection
didSendBodyData: (NSInteger)bytesWritten
totalBytesWritten: (NSInteger)totalBytesWritten
totalBytesExpectedToWrite: (NSInteger)totalBytesExpectedToWrite;
Discussion:

The byte count arguments refer to the aggregated FBSDKGraphRequest objects, not a particular FBSDKGraphRequest. Like NSURLConnection, the values may change in unexpected ways if data needs to be resent.

Declared In: FBSDKGraphRequestConnection.h
requestConnectionDidFinishLoading:

Tells the delegate the request connection finished loading

ParameterDescription
connection

The request connection that successfully completed a network request

- (void) requestConnectionDidFinishLoading:(FBSDKGraphRequestConnection *)connection;
Discussion:

If the request connection completes without a network error occurring then this method is called. Invocation of this method does not indicate success of every FBSDKGraphRequest made, only that the request connection has no further activity. Use the error argument passed to the FBSDKGraphRequestHandler block to determine success or failure of each FBSDKGraphRequest. This method is invoked after the completion handler for each FBSDKGraphRequest.

Declared In: FBSDKGraphRequestConnection.h
requestConnectionWillBeginLoading:

Tells the delegate the request connection will begin loading

ParameterDescription
connection

The request connection that is starting a network request

- (void) requestConnectionWillBeginLoading:(FBSDKGraphRequestConnection *)connection;
Discussion:

If the FBSDKGraphRequestConnection is created using one of the convenience factory methods prefixed with start, the object returned from the convenience method has already begun loading and this method will not be called when the delegate is set.

Declared In: FBSDKGraphRequestConnection.h