Causes the connection to begin loading data, if it has not already.
- iOS 2.0+
- macOS 10.5+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
Calling this method is necessary only if you create a connection with the
init(request: method and provide
false for the
start parameter. If you don’t schedule the connection in a run loop or an operation queue before calling this method, the connection is scheduled in the current run loop in the default mode.