问题描述
我正在创建我的第一个 IOS 应用程序，并且很难理解为什么 CalloutAccessoryControlTapped Control 功能不起作用。
“信息”按钮出现在注释上，但当用户点击“信息”按钮时，没有任何反应。在此处查看屏幕截图：Screenshot of Annotation。
我在视图控制器中创建了一个函数来添加标注附件视图，并怀疑该函数有问题。
任何帮助将不胜感激！
功能如下：
func mapView(_ mapView: MKMapView,annotationView view: MKAnnotationView,calloutAccessoryControlTapped control: UIControl) {
let annotation = view.annotation as? Fire
let status = "Fire Status: Active"
let distance = "Fire Location: 25 miles away"
let ac = UIAlertController(title: status,message: distance,preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "Close",style: .default))
self.present(ac,animated: true,completion: nil)
}
这是我的视图控制器中的代码——2021 年 4 月 20 日更新：
import MapKit
import UIKit
import CoreLocation
class FireMapViewController: UIViewController,CLLocationManagerDelegate {
@IBOutlet weak var FireMapView: MKMapView!
let mapView = MKMapView()
var locationManager = CLLocationManager()
var lat = Double()
var lon = Double()
var fires: [Fire] = []
override func viewDidLoad() {
super.viewDidLoad()
setupMapView()
checkLocationServices()
mapView.register(FireMarkerView.self,forAnnotationViewWithReuseIdentifier:
MKMapViewDefaultAnnotationViewReuseIdentifier)
//Initiate URL Session to get Fire data and add Fire data to the Map Annotations
if let url = URL(string: "https://services3.arcgis.com/T4QMspbfLg3qTGWY/arcgis/rest/services/Active_Fires/FeatureServer/0/query?outFields=*&where=1%3D1&f=geojson") {
URLSession.shared.dataTask(with: url) {data,response,error in
if let data = data {
do {
let features = try MKGeoJSONDecoder().decode(data)
.compactMap { $0 as? MKGeoJSONFeature }
let validWorks = features.compactMap(Fire.init)
self.fires.append(contentsOf: validWorks)
DispatchQueue.main.async {
self.mapView.addAnnotations(self.fires)
}
}
catch let error {
print(error)
}
}
}.resume()
}
}
func setupMapView() {
view.addSubview(mapView)
mapView.translatesAutoresizingMaskIntoConstraints = false
mapView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
mapView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
mapView.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor).isActive = true
mapView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor).isActive = true
}
func checkLocationServices() {
if CLLocationManager.locationServicesEnabled() {
setupLocationManager()
locationManagerDidChangeAuthorization(locationManager)
} else {
// the user didn't turn it on
}
}
//Get the current location permissions for User
func locationManagerDidChangeAuthorization(_ manager: CLLocationManager) {
switch manager.authorizationStatus {
case .authorizedAlways,.authorizedWhenInUse:
mapView.showsUserLocation = true
followUserLocation()
locationManager.startUpdatingLocation()
break
case .notDetermined,.denied,.restricted:
locationManager.requestWhenInUseAuthorization()
break
default:
break
}
switch manager.accuracyAuthorization {
case .fullAccuracy:
break
case .reducedAccuracy:
break
default:
break
}
}
func setupLocationManager() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
}
func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else { return }
let region = MKCoordinateRegion.init(center: location.coordinate,latitudinalMeters: 160934,longitudinalMeters: 160934)
mapView.setRegion(region,animated: true)
print("Fire Map User Location on Map:",location.coordinate)
// Call stopUpdatingLocation() to stop listening for location updates,// other wise this function will be called every time when user location changes.
// Need a solution for this.
manager.stopUpdatingLocation()
}
func followUserLocation() {
if let location = locationManager.location?.coordinate {
let region = MKCoordinateRegion.init(center: location,latitudinalMeters: 4000,longitudinalMeters: 4000)
mapView.setRegion(region,animated: true)
}
}
func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
locationManagerDidChangeAuthorization(locationManager)
}
//Function to display additional Fire data after User selects the Callout Info button on the Annotation
func mapView(_ mapView: MKMapView,calloutAccessoryControlTapped control: UIControl) {
let annotation = view.annotation as? Fire
print("callout Accessory Tapped!")
let status = "Fire Status: Active"
let distance = "Fire Location: 25 miles away"
let ac = UIAlertController(title: status,preferredStyle: .alert)
ac.addAction(UIAlertAction(title: "Close",style: .default))
self.present(ac,completion: nil)
}
}
这是注解的类：
import Foundation
import MapKit
class FireMarkerView: MKAnnotationView {
override var annotation: MKAnnotation? {
willSet {
guard let fire = newValue as? Fire else {
return
}
canShowCallout = true
calloutOffset = CGPoint(x: -5,y: 5)
rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
image = fire.image
}
}
}
这是模型的类：
import Foundation
import MapKit
class Fire: NSObject,MKAnnotation {
let title: String?
let county: String?
let city: String?
let incidentTypeCategory: String?
let coordinate: CLLocationCoordinate2D
let percentContained: Int?
let lastUpdateDateTime: Int?
init(
title: String?,county: String?,city: String?,incidentTypeCategory: String?,coordinate: CLLocationCoordinate2D,percentContained: Int?,lastUpdateDateTime: Int?
) {
self.title = title
self.county = county
self.city = city
self.incidentTypeCategory = incidentTypeCategory
self.coordinate = coordinate
self.percentContained = percentContained
self.lastUpdateDateTime = lastUpdateDateTime
super.init()
}
init?(feature: MKGeoJSONFeature) {
// 1
guard
let point = feature.geometry.first as? MKPointAnnotation,let propertiesData = feature.properties,let json = try? JSONSerialization.jsonObject(with: propertiesData),let properties = json as? [String: Any]
else {
return nil
}
// 2
title = ((properties["IncidentName"] as? String ?? "Unknown") + " Wildfire")
county = ((properties["POOCounty"] as? String ?? "Unknown") + " County")
city = properties["POOCity"] as? String
incidentTypeCategory = properties["IncidentTypeCategory"] as? String
coordinate = point.coordinate
percentContained = properties["PercentContained"] as? Int
lastUpdateDateTime = properties["ModifiedOnDateTime_dt"] as? Int
super.init()
}
var subtitle: String? {
return (county)
}
var image: UIImage {
guard let name = incidentTypeCategory else {
return #imageLiteral(resourceName: "RedFlame")
}
switch name {
case "RX":
return #imageLiteral(resourceName: "YellowFlame")
default:
return #imageLiteral(resourceName: "RedFlame")
}
}
}
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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