The NSURLSession protocol defines delegate methods that you should implement when using URLSession stream tasks.
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Framework
In addition to these methods, be sure to implement the methods in the URLSession and URLSession protocols to handle events common to all task types and session-level events, respectively.
func urlTells the delegate that the read side of the underlying socket has been closed.
func urlTells the delegate that the write side of the underlying socket has been closed.
func urlTells the delegate that a better route to the host has been detected for the stream.
func urlTells the delegate that the stream task has been completed as a result of the stream task calling the capture method.
func streamCreates a task that establishes a bidirectional TCP/IP connection to a specified hostname and port.
func streamCreates a task that establishes a bidirectional TCP/IP connection using a specified network service.
class URLSessionA URL session task that is stream-based.