Swift MapKit - 向注释添加(额外)属性？

Question

我做了this MapKit-教程

一切正常，但如何为我的 pin 添加额外的属性？

这是我的课车:

import Foundation
import MapKit

class Car: NSObject, MKAnnotation {

let title: String
let subtitle: String
let thirdAttribut: String
let coordinate: CLLocationCoordinate2D

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

    super.init()
}


var getTitle: String {
    return title
}

var getSubtitle: String {
    return subtitle
}

var getThirdAttribut: String {
    return thirdAttribut
}

我想点击一个图钉并使用这个“thirdAttribut”。我的主类:

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    mapView.delegate = self
    let car = Car(title: "Title", subtitle: "Subtitle", thirdAttribut: "ThirdAttribut", coordinate: CLLocationCoordinate2D(latitude: 50.906849, longitude: 7.524224) )
    mapView.addAnnotation(car)

    }


func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
  //some config stuff
}



    func mapView(mapView: MKMapView!, didSelectAnnotationView view: MKAnnotationView!) {
    print("Here Comes the Click")

    print(view.annotation.title)
    print(view.annotation.subtitle)
    //view.annotation.thirdAttribut doesn't existis
    //How get I my "thirdAttribut"-Attribut?

    }

第三个属性不能出现在我的 View 中。它只包含一些用于逻辑运算的数据。

我希望你能理解我，英语不是我的母语。

如果您知道其他方法来编写我想要的代码，请告诉我。 :)

谢谢你!

Answer 1

注释 View 包含注释属性。要获得第三个属性，您需要将 MKAnnotation 转换为您创建的遵守 MKAnnotation 协议(protocol) Car 的类。

if let carAnnotation = view.annotation as? Car{
    print(carAnnotation.thirdAttrib);
}