Resizable Table Footer View

DynamicTableViewController.swift

/*
 * Solution - https://github.com/daveanderson/TableViewHeader
*/

class DynamicTableViewController: UITableViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func updateViewConstraints() {
        super.updateViewConstraints()
        
        sizeFooterToFit()
    }
    
    private func sizeFooterToFit() {
        
        // 1
        let footerView = tableView.tableFooterView!
        footerView.translatesAutoresizingMaskIntoConstraints = false
        
        // 1.5
        let temporaryWidthConstraints = NSLayoutConstraint.constraintsWithVisualFormat("[footerView(width)]",
            options: NSLayoutFormatOptions(rawValue: 0),
            metrics: ["width": footerView.frame.width],
            views: ["footerView": footerView])
        
        footerView.addConstraints(temporaryWidthConstraints)
        
        // 2
        footerView.setNeedsLayout()
        footerView.layoutIfNeeded()
        
        let size = footerView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)
        var frame = footerView.frame
        frame.origin = CGPointZero
        frame.size = size
        footerView.frame = frame
        
        tableView.tableFooterView = footerView
        
        
        // 3.5
        footerView.removeConstraints(temporaryWidthConstraints)
        
        // 4
        footerView.translatesAutoresizingMaskIntoConstraints = true
    }
}

StaticTableViewController.swift

class StaticTableViewController: UITableViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.rowHeight = UITableViewAutomaticDimension
        tableView.estimatedRowHeight = 100
    }
    
    override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return UITableViewAutomaticDimension
    }

}