如何访问 MKAnnotation 的特定索引

Question

我有一个使用 MKAnnotations 填充标记的 mapView。我能够很好地获得注释数组。但是，我如何找出被点击的标记的索引？假设我点击了一个标记并弹出了 MKAnnotation。如何获取此注解实例？

ViewDidAppear 代码：

    for (var i=0; i<latArray.count; i++) {

    let individualAnnotation = Annotations(title: addressArray[i],
        coordinate: CLLocationCoordinate2D(latitude: latArray[i], longitude: longArray[i]))

    mapView.addAnnotation(individualAnnotation)
    }        
    //store annotations into a variable
    var annotationArray = self.mapView.annotations

    //prints out an current annotations in array
    //Result:  [<AppName.Annotations: 0x185535a0>, <AppName.Annotations: 0x1663a5c0>, <AppName.Annotations: 0x18575fa0>, <AppName.Annotations: 0x185533a0>, <AppName.Annotations: 0x18553800>]
    println(annotationArray)

注解类： 导入 MapKit

class Annotations: NSObject, MKAnnotation {
    let title: String
    //let locationName: String
    //let discipline: String
    let coordinate: CLLocationCoordinate2D

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

    super.init()
}

var subtitle: String {
    return title
}
}

Answer 1

MKMapViewDelegate 提供了一个委托方法mapView:annotationView:calloutAccessoryControlTapped: 实现此方法可为您提供您正在寻找的 MKAnnotation 实例的 MKAnnotationView。您可以调用MKAnnotationView 的annotation 属性来获取MKAnnotation 的对应实例。

import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate {

   @IBOutlet weak var mapView: MKMapView!

   var sortedAnnotationArray: [MKAnnotation] = [] //create your array of annotations.

   //your ViewDidAppear now looks like:
   override func viewDidAppear(animated: Bool) {
       super.viewDidAppear(animated)
       for (var i = 0; i < latArray.count; i++) {
         let individualAnnotation = Annotations(title: addressArray[i], coordinate: CLLocationCoordinate2D(latitude: latArray[i], longitude: longArray[i]))
         mapView.addAnnotation(individualAnnotation) 
         //append the newly added annotation to the array
         sortedAnnotationArray.append(individualAnnotation)
       } 
    }     



  func mapView(mapView: MKMapView!, annotationView view:    MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!) {
       let theAnnotation = view.annotation
        for (index, value) in enumerate(sortedAnnotationArray) {
            if value === theAnnotation {
                println("The annotation's array index is \(index)")
            }
        }
    }
}