Table View Cell Dynamic Height With AutoLayout for iOS 7 later

Update new post talks about UITableView dynamic height with AutoLayout

UITableViewCell dynamic height with AutoLayout conclusion

We all know iOS 8 introduced auto-sizing tableview cell What's New in Table and Collection Views Session 226, but that are compatible with iOS 8 later. So, maybe later.

I setup my auto layout cell programmatically using PureLayout.

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

    return self;
}

- (void)layoutSubviews
{
    [super layoutSubviews];

    [self.contentView setNeedsLayout];
    [self.contentView layoutIfNeeded];

    self.textLabel.preferredMaxLayoutWidth = CGRectGetWidth(self.textLabel.frame);
}

Table View needs some settings as well

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static CustomizedCell *sizingCell = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
    sizingCell = [self.tableView dequeueReusableCellWithIdentifier:kCellIdentifier];
});
    sizingCell.textLabel.text = @“Random length strings”;
    [sizingCell setNeedsLayout];
    [sizingCell layoutIfNeeded];
    CGFloat height = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
    return height;
}

What dispatch_once done is to prevent memory leaks as the cell is created but not returning from cellForRowAtIndexPath.

You may occur auto-layout conflicts with UIView-Encapsulated-Layout-Height, then you should lower your own constrains priority to make UIView-Encapsulated-Layout-Height pass first, never mind, your height will be set properly when your cell been calculate by yourself and auto layout will fits that height.

Update new post talks about UITableView dynamic height with AutoLayout

UITableViewCell dynamic height with AutoLayout conclusion