On Tue, May 24, 2016, at 05:46 PM, Kyle Sluder wrote:
> On Tue, May 24, 2016, at 05:37 PM, Alex Zavatone wrote:
> >
> > On May 24, 2016, at 4:02 PM, Kyle Sluder wrote:
> >
> > > On Tue, May 24, 2016, at 12:33 PM, Doug Hill wrote:
> > >> OK, this might have been more obvious to people, but it finally came to
> > >> me how to handle the keyboard display.
> > >>
> > >> Instead of changing the view size, I move the center of the view up, then
> > >> apply a content inset to the table to adjust for the part of the table
> > >> offscreen. Animations seem to work much better now.
> > >
> > > Did you really mean “move the center of the view”? Or did you mean
> > > scrolling the center of the viewport?
> > >
> > > Either way, contentInset is definitely the way to handle this.
> >
> > Just checking. You meant to use contentInset and not contentOffset?
>
> Yes, I meant contentInset. contentOffset is just another name for
> self.bounds.origin.
To clarify: you might want to change both the contentInset (to avoid the
keyboard) *and* the contentOffset (to move content that has been
obscured by the keyboard back into the visible part of the scrollview.)
--Kyle Sluder
>
> --Kyle Sluder
>
> >
> > I'm going to need to handle this exact issue soon too.
> >
> > Thanks, Kyle.
> >
> > Alex Zavatone
> >
> > > --Kyle Sluder
> > >
> > >>
> > >> Doug Hill
> > >>
> > >>> On May 20, 2016, at 5:21 PM, Doug Hill <cocoa...@breaqz.com> wrote:
> > >>>
> > >>> I’m implementing a chat message view with a table view and a text field
> > >>> underneath it. I want the most recent messages at the bottom, and the
> > >>> scroll position always to stay at the last row in the table.
> > >>>
> > >>> There are some tricks to making sure the table scrolls to the bottom
> > >>> when it’s first drawn and when adding new rows. I seem to be able to
> > >>> make this work but I’m running into a problem keeping the table
> > >>> scrolled to the bottom when the keyboard is shown. I listen for the
> > >>> 'keyboard shown’ notification and adjust the height of my entire view
> > >>> by the height of keyboard. This works but the scroll position ends up
> > >>> wrong, as it doesn’t keep the same scroll position at the last row when
> > >>> the view is moved up. OK, so I set the contentOffset to compensate for
> > >>> this.
> > >>>
> > >>> Here is the code I use in the Keyboard Will show notification:
> > >>>
> > >>> [UIView animateWithDuration:keyboardAnimDuration
> > >>> animations:
> > >>> ^{
> > >>> self.view.frame = newViewFrame;
> > >>> }
> > >>> completion:^(BOOL finished)
> > >>> {
> > >>> [self.myTableView setContentOffset:newContentOffset animated:NO];
> > >>> }];
> > >>>
> > >>> So far, things work pretty well and things end up in the right place
> > >>> with. However, the animation is weird.
> > >>>
> > >>> • Even though the view frame is changed inside the animation block, it
> > >>> moves into place immediately with no animation. No matter what duration
> > >>> I set it seems to be ignored.
> > >>> • Then the keyboard scrolls into place. Because my view has already
> > >>> been moved up, you see a blank space where the keyboard moves up and
> > >>> over. This looks pretty bad.
> > >>> • The table scrolls with an animation even though contentOffset is
> > >>> changed in the completion block and I set the animated param to NO.
> > >>> • The time for the table scroll to animate is fixed.
> > >>>
> > >>> Here is an example of this animation:
> > >>>
> > >>> https://youtu.be/SBSts2UOJXw
> > >>>
> > >>> (Try on slow speed to see it better)
> > >>>
> > >>> I know this can be done correctly because I see other iOS chat apps
> > >>> that make the list view move up with the keyboard in a coordinated,
> > >>> smooth animation. Any ideas?
> > >>>
> > >>> Doug
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