On Apr 20, 2008, at 8:12 PM, Jens Alfke wrote:
On 20 Apr '08, at 5:38 PM, Jack Repenning wrote:
I confess what I actually want is a bit more complicated than
always positioning at the bottom: if the user has moved the thumb
about, then the user's chosen position should win; it's only if the
thumb is bottomed at the moment I add the next line that I would
"autoscroll." I suspect some further subtleties lurk in the
neighborhood of the transition out of "not enough data even to fill
one screen full." This seems familiar enough, and subtle enough,
that surely it must be hiding in the library somewhere? I don't
have to reinvent this wheel, do I? Because I went lookin' for the
pieces to do that, and came up dry there as well!
You have to implement it yourself.
1. Before appending text, check the view's vertical scroller to see
if it's at the bottom.
2. Append the text.
3. If the scroller used to be at the end, scroll to the bottom by
getting the coordinates of the bottom of the view and telling the
view to scroll to there by calling scrollRectToVisible:.
Or you could tell the text view to scrollRangeToVisible:
(typed into mail)
[myTextView scrollRangeToVisible:NSMakeRange([[myTextView string]
length], 0)]
--Nathan
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