ECStretchableHeaderView *headerView;

    headerView = [[ECStretchableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, CGRectGetWidth(self.tableView.frame), maxHeight)];

    // the header will expand up to 320 pixels tall when scrolling down
    headerView.maxHeight = 320.0f;

    // the header will shrink down to 100 pixels tall when scrolling up
    headerView.minHeight = 100.0f;

    // for demo purposes we programmatically create
    // a height constraint for the header view 
    // but more likely you will create it on Interface Builder 
    // and assign it to a private IBOutlet property

    NSLayoutConstraint *heightConstraint = [NSLayoutConstraint
                                                   constraintWithItem:headerView
                                                   attribute:NSLayoutAttributeHeight
                                                   relatedBy:NSLayoutRelationEqual
                                                      toItem:nil
                                                   attribute:NSLayoutAttributeNotAnAttribute
                                                  multiplier:1.0
                                                    constant:headerView.maxHeight]];

    [headerView addConstraint:heightConstraint];

    headerView.heightConstraint = heightConstraint;

    // put it at the top of your table vew
    [headerView attachToScrollView:self.tableView inset:0.0f];