objective c - UITableViewCell animate height issue in iOS 10

Question

My UITableViewCell will animate it's height when recognizing a tap. In iOS 9 and below this animation is smooth and works without issues. In iOS 10 beta there's a jarring jump during the animation. Is there a way to fix this?

Here is a basic example of the code.

- (void)cellTapped {
    [self.tableView beginUpdates];
    [self.tableView endUpdates];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return self.shouldExpandCell ? 200.0f : 100.0f;
}

EDIT: 9/8/16

The issue still exists in the GM. After more debugging I have discovered the issue is related to the cell immediately jumping to the new height and then will animate the relevant cells offset. This means any CGRect based animation which is dependent on the cells bottom will not work.

For instance if I have a view constrained to the cells bottom, it will jump. The solution would involve a constraint to the top with a dynamic constant. Or think of another way to position your views other then related to the bottom.

Answer 1

The solution for iOS 10 in Swift with AutoLayout :

Put this code in your custom UITableViewCell

override func layoutSubviews() {
    super.layoutSubviews()

    if #available(iOS 10, *) {
        UIView.animateWithDuration(0.3) { self.contentView.layoutIfNeeded() }
    }
}

In Objective-C:

- (void)layoutSubviews
{
    [super layoutSubviews];

    NSOperatingSystemVersion ios10 = (NSOperatingSystemVersion){10, 0, 0};
    if ([[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:ios10]) {
        [UIView animateWithDuration:0.3
                         animations:^{
                             [self.contentView layoutIfNeeded];
                         }];
    }
}

This will animate UITableViewCell change height if you have configured your UITableViewDelegate like below :

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    return selectedIndexes.contains(indexPath.row) ? Constants.expandedTableViewCellHeight : Constants.collapsedTableViewCellHeight
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    tableView.deselectRowAtIndexPath(indexPath, animated: true)
    tableView.beginUpdates()
    if let index = selectedIndexes.indexOf(indexPath.row) {
        selectedIndexes.removeAtIndex(index)
    } else {
        selectedIndexes.append(indexPath.row)
    }
    tableView.endUpdates()
}