Get HeaderView Sized with SnapKit

Header.swift

//
//  ViewController.swift
//  SnapKitTest
//
//  Created by Robert Payne on 10/11/15.
//  Copyright © 2015 Zwopple Limited. All rights reserved.
//

import SnapKit
import UIKit

class ViewController: UIViewController, UITableViewDelegate {
    
    let tableView = UITableView()
    
    let headerHeight: CGFloat = 75
    let hedder = UIView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.view.addSubview(self.tableView)
        
        self.tableView.snp_makeConstraints { (make) -> Void in
            make.edges.equalTo(self.view)
        }
        
        self.tableView.delegate = self
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        //need to force redraw here, then hedder is guaranteed to be attached to tableView
        tableView.setNeedsLayout()
        tableView.layoutIfNeeded()
        
        hedder.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(self.tableView)
            make.width.equalTo(self.view)
            make.height.equalTo(headerHeight)
            make.centerX.equalTo(self.view)
        }
    }
    
    func tableView(tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return headerHeight
    }
    
    func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        hedder.backgroundColor = UIColor.purpleColor()
        return hedder
    }
}