ios - Swift:MapView calloutAccessoryControlTapped 索引

Question

class MapViewController: UIViewController, MKMapViewDelegate, HomeModelProtocol {

var feedItems: NSArray = NSArray()
var selectedLocation : LocationModel = LocationModel()


@IBOutlet weak var mapView: MKMapView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    let initialLocation = CLLocation(latitude: 45.444958, longitude: 12.328463)

    centerMapLocation(location: initialLocation)
    mapView.delegate = self

    let homeModel = HomeModel()
    homeModel.delegate = self
    homeModel.downloadItems()


}

func itemsDownloaded(items: NSArray) {
    feedItems = items

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

let regionRadus: CLLocationDistance = 1000
func centerMapLocation(location: CLLocation){
    let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate, regionRadus, regionRadus)
mapView.setRegion(coordinateRegion, animated: true)
}

override func viewDidAppear(_ animated: Bool) {

    super.viewDidAppear(animated)
    //checkLocationAuthorizationStatus()
    displayLocations()
}
func displayLocations(){

    let i = feedItems.count
    var x = 0
    while x<i{
        let item: LocationModel = feedItems[x] as! LocationModel

        var poiCoodinates = CLLocationCoordinate2D()

        poiCoodinates.latitude = CDouble(item.latitude!)!
        poiCoodinates.longitude = CDouble(item.longitude!)!


        let pin: MKPointAnnotation = MKPointAnnotation()
        pin.coordinate = poiCoodinates
        self.mapView.addAnnotation(pin)

        pin.title = item.name
        pin.subtitle = item.address
        x = x+1
        }
    //return loc
    }

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    let view = MKMarkerAnnotationView(annotation: selectedLocation as? MKAnnotation, reuseIdentifier: "pin")
    view.canShowCallout = true
    view.calloutOffset = CGPoint(x: -5, y: 5)
    view.leftCalloutAccessoryView = UIButton(type: .detailDisclosure)
    return view
}

func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {

    print(control.tag)
    selectedLocation = feedItems[0] as! LocationModel
    performSegue(withIdentifier: "InformationSegue", sender: self)


}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    // Get reference to the destination view controller
    let detailVC  = segue.destination as! InformationViewController
    // Set the property to the selected location so when the view for
    // detail view controller loads, it can access that property to get the feeditem obj
    detailVC.selectedLocation = selectedLocation
}
}

这是我的代码。我想在下一个 View Controller 中显示位置。我需要获取 feeditems[] 处的索引。我如何获取索引:

   func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl)

那么我如何获取点击哪个按钮的索引。 map 中放置了许多对象。

感谢您的帮助，并对我的英语不好表示歉意，希望你们理解我。

Answer 1

1.定义子类MKPointAnnotation。

class MyPointAnnotation: MKPointAnnotation {
    var feedItem: LocationModel
}

2.将MyPointAnnotation.feedItem设置为feedItem。

let item: LocationModel = feedItems[x] as! LocationModel

var poiCoodinates = CLLocationCoordinate2D()
poiCoodinates.latitude = CDouble(item.latitude!)!
poiCoodinates.longitude = CDouble(item.longitude!)!

let pin: MyPointAnnotation = MyPointAnnotation()
pin.coordinate = poiCoodinates
pin.feedItem = item // Important!
self.mapView.addAnnotation(pin)

3.在calloutAccessoryControlTapped委托(delegate)方法中获取feedItem。

func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
    if let pin = view.annotation as? MyPointAnnotation {
        print(pin.feedItem)
    }
}