Swift，如何在单击时从自定义注释中获取信息

Question

我有以下自定义注释类：

import UIKit
import MapKit

class LocationMapAnnotation: NSObject, MKAnnotation {
    var title: String?
    var coordinate: CLLocationCoordinate2D
    var location: Location

    init(title: String, coordinate: CLLocationCoordinate2D, location: Location) {
        self.title = title
        self.coordinate = coordinate
        self.location = location
    }
}

我正在将注释加载到这样的地图视图中：

for i in 0..<allLocations.count{
            //Add an annotation
            let l: Location = self.allLocations[i] as! Location
            let coordinates = CLLocationCoordinate2DMake(l.latitude as Double, l.longitude as Double)
            let annotation = LocationAnnotation(title: l.name, coordinate: coordinates, location: l)
            mapView.addAnnotation(annotation)
        }

我想从选定的注释中获取Location 对象。目前我有这个方法，当我点击注释时会调用它，但我不确定如何从注释中检索特定对象。

func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
    print("Annotation selected")

    //performSegueWithIdentifier("locationInfoSegue", sender: self)
}

谢谢。

Answer 1

您可以在 didSelectAnnotationView 中获取您的 Annotation，然后它会为您提供 MKAnnotationView。这个 MKAnnotationView 将 MKAnnotation 作为一个对象。

func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
    println("Annotation selected")

    if let annotation = view.annotation as? LocationMapAnnotation {
        println("Your annotation title: \(annotation.title)");
    }
}