title: How to add a button to the MKPointAnnotation?
body: <p>I've just got stuck trying to add a detail button to my annotation point, unfortunately I don't know how to do it. Does anyone could help me with that? </p>
  
  <p>The image below presents what I'd like to achieve. Thanks! <img src="https://i.stack.imgur.com/kK1Ox.jpg" alt="enter image description here"></p>
  
  <p><strong>MapKitViewController:</strong></p>
  
  <pre><code>import UIKit
  import MapKit
  import CoreLocation
  
  class MapKitViewController: UIViewController, MKMapViewDelegate
  {
  
  let locationManager = CLLocationManager()
  
  @IBOutlet weak var nmapView: MKMapView!
  override func viewDidLoad()
  {
      super.viewDidLoad()
      locationManager.requestWhenInUseAuthorization()
      locationManager.startUpdatingLocation()
      let location = CLLocationCoordinate2D(
          latitude: 53.4265107,
          longitude: 14.5520357)
  
      let span = MKCoordinateSpanMake(0.05, 0.05)
      let region = MKCoordinateRegion(center: location, span: span)
      nmapView.setRegion(region, animated: true)
      nmapView.showsPointsOfInterest = false
      nmapView.showsUserLocation = true
      displayMarkers()
  }
  
  func displayMarkers() -&gt; Void
  {
      let jsonURL: NSURL = NSURL(string: "http://jsonstring.com/")!
  
      var dataFromNetwork: NSData = NSData(contentsOfURL: jsonURL)!
      let json = JSON(data: dataFromNetwork)
      var jsonSize = json.count
  
      var todaysDate:NSDate = NSDate()
      var dateFormatter:NSDateFormatter = NSDateFormatter()
      dateFormatter.dateFormat = "yyyy-MM-dd"
      var formattedDate:String = dateFormatter.stringFromDate(todaysDate)
  
      let annotationView = MKAnnotationView()
      let detailButton: UIButton = UIButton.buttonWithType(UIButtonType.DetailDisclosure) as UIButton
      annotationView.rightCalloutAccessoryView = detailButton
  
  
      for(var i = 0; i &lt; jsonSize; i++)
      {
          if(json[i]["rozpoczecie"].stringValue == formattedDate)
          {
              let clubID = json[i]["id_klub"].stringValue
              let annotation = MKPointAnnotation()
              let (resultSet, err) = SD.executeQuery("SELECT * FROM Clubs WHERE ID = ?", withArgs: [clubID])
              if(err != nil){println("blad")}
              else
              {
                  for row in resultSet
                  {
                      let name = row["Name"]?.asString()
                      let latitude = row["Latitude"]?.asDouble()
                      let longitude = row["Longitude"]?.asDouble()
                      annotation.title = name
                      var markerLatitude: Double = latitude!
                      var markerLongitude: Double = longitude!
                      let location = CLLocationCoordinate2D(latitude: markerLatitude, longitude: markerLongitude)
                      annotation.setCoordinate(location)
                      annotation.subtitle = json[i]["nazwa"].stringValue
                  }
                  nmapView.addAnnotation(annotation)
              }
          }
      }
  }
  </code></pre>