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.
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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