Er, for reference, the view hierarchy is this:
http://latencyzero.com/stuff/ViewHierarchy.png
On Apr 16, 2012, at 18:16 , Rick Mann wrote:
>
> On Apr 16, 2012, at 16:32 , Luke Hiesterman wrote:
>
>> You can do this by wrapping the operation in your own animation block. This
>> simple code demonstrates doing it on 44 point high rows:
>>
>> [UIView animateWithDuration:0.3 animations:^(void) {
>> [tableView beginUpdates];
>> CGPoint contentOffset = tableView.contentOffset;
>> if (contentOffset.y > 0) {
>> contentOffset.y += 44;
>> tableView.contentOffset = contentOffset;
>> }
>> [tableView insertRowsAtIndexPaths:[NSArray
>> arrayWithObject:[NSIndexPath indexPathForRow:__numRows inSection:0]]
>> withRowAnimation:UITableViewRowAnimationAutomatic];
>> __numRows++;
>> [tableView endUpdates];
>> }];
>
> Yeah, this is essentially what I do, but while I can correctly animate the
> frame change alone, if I try to do that AND change contentOffset, it doesn't
> work.
>
> Please see the following videos. For reference, the view hierarchy is this:
>
> http://latencyzero.com/stuff/AdjustingOffset.mov
>
> The parent View is a blue color. The Container view is green. The UITableView
> is pink.
>
> If I do not adjust the content offset (that is, if it gets set to 0.0), you
> can see the views move and resize correctly:
>
> http://latencyzero.com/stuff/AdjustingOffset.mov
>
> If I DO adjust the content offset (even if I hard-code it to 10 pixels),
> everything ends up in the right place, but the table view immediately resizes
> to the proper height, but the frame.origin.y is adjusted about 81 pixels down
> in the view. It snaps to this position, THEN animates to the correct position.
>
> http://latencyzero.com/stuff/NoOffsetAdjustment.mov
>
> The code that does this (for the keyboard appearing) is here:
>
> http://pastebin.com/zRSR78fZ
>
>>>
>>> 2) When animating a frame change, are subframe re-sizes also animated? It
>>> looks like they're partly immediately update, then animating.
>>
>> Any subviews which are resized in the scope of the superview's frame change
>> will share the animation, which includes anything that has autoresizing
>> masks. You may need to invoke -layoutIfNeeded within your animation block on
>> views who defer resizing of their subviews until layout time to capture some
>> things in an animation. But that discussion is orthogonal to your stated
>> goal, which can be achieved by following the sample I've provided above.
>
> I tried throwing in a -layoutIfNeeded, but it had no effect.
>
> --
> Rick
>
>
>
>
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