Instance Method: dataTask(with:completionHandler:)

Creates a task that retrieves the contents of the specified URL, then calls a handler upon completion.

 

Declaration

func dataTask(with url: URL, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) -> URLSessionDataTask

 

The dataTask method passed back 3 values, all of which are optional - Data?, URLResponse?, and Error?.

 

developer.apple.com/documentation/foundation/urlsession/1410330-datatask

Apple Developer Documentation