title: How to add MKMapView to tableView.BackgroundView with constraints
body: <p>Im adding a MKMapView to my tableview background in ViewdidLoad simply like this and its working.</p>
  
  <pre><code>override func viewDidLoad() {
      super.viewDidLoad()
  
      var myMapView = MKMapView(frame: CGRectMake(0, 0, 100, 500))
      myMapView.mapType = MKMapType.Standard
  
      self.tableView.backgroundView? = myMapView
  
  
  }
  </code></pre>
  
  <p>This displays the map view in the background of the tableview but I wish for the MapView to only be displayed on the bottom of the tableview background and with the height of 250</p>
  
  <p>Im guessing you have to add it as a subview and add constraints, could somebody show me some code as to how they would go about this?</p>
  
  <p>Thanks!</p>