Resize UITableViewCell containing UITextView upon typing

Question

I have an UITableViewController that contains a custom cell. Each cell was created using a nib and contains a single non-scrollable UITextView. I have added constraints insi

Answer 1

I've implemented a similar approach using a UITextView however to do so I had to implement heightForRowAtIndexPath

#pragma mark - SizingCell

- (USNTextViewTableViewCell *)sizingCell
{
    if (!_sizingCell)
    {
        _sizingCell = [[USNTextViewTableViewCell alloc] initWithFrame:CGRectMake(0.0f,
                                                                                 0.0f,
                                                                                 self.tableView.frame.size.width,
                                                                                 0.0f)];
    }

    return _sizingCell;
}

#pragma mark - UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    self.sizingCell.textView.text = self.profileUpdate.bio;

    [self.sizingCell setNeedsUpdateConstraints];
    [self.sizingCell updateConstraintsIfNeeded];

    [self.sizingCell setNeedsLayout];
    [self.sizingCell layoutIfNeeded];

    CGSize cellSize = [self.sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];

    return cellSize.height;
}

sizingCell is an instance of the cell that is only used for sizing calculations.

What's important to note is that you need to attach the UITextView's upper and lower edge to the UITableViewCells contentView's upper and lower edge so that as the UITableViewCell changes in height the UITextView also changes in height.

For constraint layout I use a PureLayout (https://github.com/smileyborg/PureLayout) so the following constraint layout code may be unusual for you:

#pragma mark - Init

- (id)initWithStyle:(UITableViewCellStyle)style
    reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style
                reuseIdentifier:reuseIdentifier];

    if (self)
    {
        [self.contentView addSubview:self.textView];
    }

    return self;
}

#pragma mark - AutoLayout

- (void)updateConstraints
{
    [super updateConstraints];

    /*-------------*/

    [self.textView autoPinEdgeToSuperviewEdge:ALEdgeLeft
                                    withInset:10.0f];

    [self.textView autoPinEdgeToSuperviewEdge:ALEdgeTop
                                    withInset:5.0f];

    [self.textView autoPinEdgeToSuperviewEdge:ALEdgeBottom
                                    withInset:5.0f];

    [self.textView autoSetDimension:ALDimensionWidth
                             toSize:200.0f];
}