Is it possible to simulate long press with UISpec

[William Eastwood]

I am trying desperately to find a way to simulate long-press to do
some automation test. What I want is activating the magnifier of a
UITextField and move it around. I know this may sound a little bizarre
in automation test, but this is exactly the demand :(

Anybody know how to do that?
Any clues are appreciated!

Thanks in advance,
William