如何从注释中获取属性数据？

Question

如何从注释中获取属性数据？ 我有：

listSelected = [Properties]()

我有问题从list属性获取图像以将其设置为pin 还有另一个问题是让我的列表在alertcontrollr中用来显示我的属性。

那怎么办呢？

func drowPropertyOnMap(list: [Properties]) {
    self.spinner.isHidden = false
    self.spinner.startAnimating()

    var annotations = [MKPointAnnotation]()

    for (index, property) in list.enumerated() {

        let propertyLat: CLLocationDegrees = property.Latitude as! CLLocationDegrees
        let propertyLong: CLLocationDegrees = property.Longitude as! CLLocationDegrees

        let coordinate = CLLocationCoordinate2D(latitude: propertyLat, longitude: propertyLong)

        let span: MKCoordinateSpan = MKCoordinateSpanMake(0.1, 0.1)
        let center: CLLocationCoordinate2D = CLLocationCoordinate2DMake(coordinate.latitude, coordinate.longitude)

        let region: MKCoordinateRegion = MKCoordinateRegionMake(center, span)

        self.mapView.setRegion(region, animated: true)

        let pointAnnotation = MKPointAnnotation()
        pointAnnotation.coordinate = coordinate
        pointAnnotation.title = property.Title
        pointAnnotation.subtitle = property.Description

        annotations.append(pointAnnotation)
    }

    // stop spinner
    self.spinner.stopAnimating()
    self.spinner.isHidden = true

    self.mapView.addAnnotations(annotations)
}

//  MARK: - MapViewDelegate

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

    if (annotation is MKUserLocation) {
        //if annotation is not an MKPointAnnotation (eg. MKUserLocation),
        //return nil so map draws default view for it (eg. blue dot)...
        return nil
    }

    let reuseId = "test"

    var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId)

    if annotationView == nil {

        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        annotationView?.image = UIImage(named:"homeIconPin")
        annotationView?.isEnabled = true
        annotationView?.canShowCallout = true

        let leftIconView = UIImageView(frame: CGRect(x: 0, y: 0, width: 53, height: 53))
        leftIconView.image = UIImage(named: "IMG_3")
        annotationView?.leftCalloutAccessoryView = leftIconView

        let btn = UIButton(type: .infoLight)
        annotationView?.rightCalloutAccessoryView = btn
        return annotationView
    } else {
        //we are re-using a view, update its annotation reference...
        annotationView?.annotation = annotation
    }

    return annotationView
}

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



    let property = view.annotation as! Properties
    let placeName = property.Title! as String
    let placeInfo = property.Description! as String


    let ac = UIAlertController(title: placeName, message: placeInfo, preferredStyle: .alert)
    ac.addAction(UIAlertAction(title: "OK", style: .default))
    present(ac, animated: true)


}

所以我需要调用属性：

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

如何制作？

Answer 1

我正在解决问题，因此我们需要从 MKPointAnnotation

添加新的 Class

从注释获取索引路径

import Foundation
import MapKit

class Annotation: MKPointAnnotation {
    var index = 0
}

之后，我们将进入控制器并添加代码

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

var listSelected = [Properties]()

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(true)       
    drowPropertyOnMap(list: listSelected)
}

//  MARK: - drowPropertyOnMap

func drowPropertyOnMap(list: [Properties]) {

    self.spinner.isHidden = false
    self.spinner.startAnimating()

    var annotations = [MKPointAnnotation]()

    for (index, property) in list.enumerated() {

        let propertyLat: CLLocationDegrees = property.Latitude as! CLLocationDegrees
        let propertyLong: CLLocationDegrees = property.Longitude as! CLLocationDegrees

        let coordinate = CLLocationCoordinate2D(latitude: propertyLat, longitude: propertyLong)

        let span: MKCoordinateSpan = MKCoordinateSpanMake(0.5, 0.5)
        let center: CLLocationCoordinate2D = CLLocationCoordinate2DMake(coordinate.latitude, coordinate.longitude)

        let region: MKCoordinateRegion = MKCoordinateRegionMake(center, span)

        self.mapView.setRegion(region, animated: true)

        let pointAnnotation = Annotation()
        pointAnnotation.index = index
        pointAnnotation.coordinate = coordinate
        pointAnnotation.title = property.Title
        pointAnnotation.subtitle = property.Description


        annotations.append(pointAnnotation)
    }

    // stop spinner
    self.spinner.stopAnimating()
    self.spinner.isHidden = true

    self.mapView.addAnnotations(annotations)
}

//  MARK: - MapViewDelegate

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

    if !(annotation is Annotation)
    {
        return nil
    }

    let reuseId = "test"

    var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId)

    if annotationView == nil {

        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        annotationView?.image = UIImage(named:"homeIconPin")
        annotationView?.isEnabled = true
        annotationView?.canShowCallout = true

        if let myAnnotation = annotation as? Annotation {

            let selectedProp = listSelected[myAnnotation.index]

            let imageString = selectedProp.Image

            let leftIconView = UIImageView(frame: CGRect(x: 0, y: 0, width: 53, height: 53))
            leftIconView.sd_setImage(with: URL(string: imageString ?? ""), placeholderImage: UIImage(named: "placeholderProperty.png"))

            annotationView?.leftCalloutAccessoryView = leftIconView
        }

        let btn = UIButton(type: .infoLight)
        annotationView?.rightCalloutAccessoryView = btn
        return annotationView

    } else {
        //we are re-using a view, update its annotation reference...
        annotationView?.annotation = annotation
    }

    return annotationView
}

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

    homeView.isHidden = false

    if let myAnnotation = view.annotation as? Annotation {

        let selectedProp = listSelected[myAnnotation.index]

        self.selectedTableData = selectedProp

        self.homeTitleLabel.text = selectedProp.Title
        self.homeSubtitleLabel.text = selectedProp.Description

        let imageString = selectedProp.Image

        self.homeImageView.sd_setImage(with: URL(string: imageString ?? ""), placeholderImage: UIImage(named: "placeholderProperty.png"))
    }
}
}