iOS UITableViewCell Height Calculation(iOS7-9)

gistfile1.txt

//For iOS9, there is a new way(buggy in iOS7,8) to calculating the cell height
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return UITableViewAutomaticDimension;
}

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {

    /* Return an estimated height or calculate 
     * estimated height dynamically on information 
     * that makes sense in your case.
     */
    return 200.0f;
}

//iOS8 or below
- (CGFloat)heightForCellAtIndexPath:(NSIndexPath *)indexPath {
    static UITableViewCell *sizingCell = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sizingCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"heightCell"];
    });
    
    [self configureCell:sizingCell atIndexPath:indexPath]; //set the necessary data into the cell
    return [self calculateHeightForConfiguredSizingCell:sizingCell];
}

- (CGFloat)calculateHeightForConfiguredSizingCell:(UITableViewCell *)sizingCell {
    //Need to set the width for it to determine the label size
    //since we are not using sizingCell = [self.tableView dequeueReusableCellWithIdentifier:@"commentCell"];
    //but sizingCell = [[CommentBaseTableViewCell alloc] init]; instead
    CGRect frame = sizingCell.frame;
    frame.size.width = CGRectGetWidth(self.vendorTableView.frame);
    sizingCell.frame = frame;
    
    [sizingCell setNeedsLayout];
    [sizingCell layoutIfNeeded];
    
    CGSize size = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
    return size.height; // Add 1.0f for the cell separator height
}

//Also, Add this code into UITableViewCell if there is any multiline Label included
-(void)layoutSubviews{
    [super layoutSubviews];
    [self.contentView layoutIfNeeded];
    self.titleLabel.preferredMaxLayoutWidth = CGRectGetWidth(self.titleLabel.frame);
}