以下是我的代码：
class SearchRunViewController: UIViewController, MKMapViewDelegate {
let databaseRef = FIRDatabase.database().reference()
var databaseHandle: UInt!
let regionRadius: CLLocationDistance = 1000
var runs = Array<RunDetail>()
var runName: String?
var distance: Int?
var time: Int?
var user: String?
var count: Int!
@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var nameLabel: UILabel!
@IBOutlet weak var distanceLabel: UILabel!
@IBOutlet weak var timeLabel: UILabel!
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
nameLabel.isHidden = true
distanceLabel.isHidden = true
timeLabel.isHidden = true
}
override func viewDidLoad() {
super.viewDidLoad()
let initialLocation = CLLocation(latitude: 37.3318, longitude: -122.0312)
centerMapOnLocation(initialLocation)
loadAnnotations { (runs) in
self.mapView.addAnnotations(runs)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func centerMapOnLocation(_ location: CLLocation) {
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
regionRadius * 2.0, regionRadius * 2.0)
mapView.setRegion(coordinateRegion, animated: true)
}
func loadAnnotations(completion: @escaping (Array<RunDetail>) -> Void) {
databaseHandle = databaseRef.child("RunList").observe(.value, with: { (snapshot) in
self.count = Int(snapshot.childrenCount)
for child in snapshot.children.allObjects as! [FIRDataSnapshot] {
let childDict = child.value as? [String: Any]
let name = childDict?["name"] as? String
let rundistance = childDict?["distance"] as? Int
let runtime = childDict?["time"] as? Int
let runuser = childDict?["user"] as? String
let runlat = childDict?["startLat"] as? Double
let runlong = childDict?["startLong"] as? Double
let runcoordinate = CLLocationCoordinate2D(latitude: runlat!, longitude: runlong!)
let runDet = RunDetail(runName: name!, coordinate: runcoordinate, user: runuser!, distance: rundistance!, time: runtime!)
self.runs.append(runDet)
}
completion(self.runs)
})
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let annotationIdentifier = "run"
var view = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier)
if view == nil {
view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
view?.canShowCallout = true
view?.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
} else {
view?.annotation = annotation
}
return view
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
nameLabel.isHidden = false
}
}
我的RunDetail类：
class RunDetail: NSObject, MKAnnotation {
let runName: String?
let coordinate: CLLocationCoordinate2D
let user: String
let distance: Int
let time: Int
init(runName: String, coordinate: CLLocationCoordinate2D, user: String, distance: Int, time: Int) {
self.runName = runName
self.coordinate = coordinate
self.user = user
self.distance = distance
self.time = time
super.init()
}
var title: String? {
return runName
}
var subtitle: String? {
return ("Distance: \(distance)m in \(time) seconds, completed by \(user)")
}
func mapItem() -> MKMapItem {
let placemark = MKPlacemark(coordinate: coordinate)
let mapItem = MKMapItem(placemark: placemark)
mapItem.name = runName
return mapItem
}
}
我相信我已经设置了所有内容，因为按钮可以显示我的注释（注释显示在地图上，而不是带有注释的按钮）。我做错了什么？