我正在尝试使用 Swift 为 iOS 8 构建一个应用程序，它使用 Parse.com 数据库在 MapView 上显示图钉。我已经成功地将地图上的所有图钉加载到我们 PFGeoPoints 上，但我正在尝试为每个图钉添加一个披露按钮，该按钮将执行 segue 以显示额外的信息。
我已经仔细检查了我的代码，但我遗漏了一些东西，有人注意到问题吗？
import UIKit
import Foundation
import Parse
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
let locationManager = CLLocationManager()
var userLocationParse = PFGeoPoint(latitude: 47.49, longitude: 19.06)
@IBOutlet weak var nmapview: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
locationManager.requestWhenInUseAuthorization()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
let location = CLLocationCoordinate2D(latitude: 47.49, longitude: 19.06)
let span = MKCoordinateSpanMake(0.03, 0.03)
let region = MKCoordinateRegion(center: location, span: span)
nmapview.setRegion(region, animated: true)
nmapview.showsPointsOfInterest = false
nmapview.showsUserLocation = true
displayMarkers()
}
func displayMarkers() -> Void {
//GET PIN DATA HERE
var query = PFQuery(className: "Places")
query.whereKey("PlaceLocation", nearGeoPoint: userLocationParse)
query.limit = 30
let foundPlaces = query.findObjects()
//GETTING PFGEOLOCATIONS AND PUTTING THEM ON MAP AS ANNOTATIONS
//Loading pin details
var annotationQuery = PFQuery(className: "Places")
annotationQuery.whereKey("PlaceLocation", nearGeoPoint: userLocationParse)
annotationQuery.findObjectsInBackgroundWithBlock {
(posts, error) -> Void in
if error == nil {
// The find succeeded.
//println("Successful query for annotations")
let myPosts = posts as! [PFObject]
for post in myPosts {
let pinAnnotation = PinAnnotation()
let point = post["PlaceLocation"] as! PFGeoPoint
let pointName = post["PlaceName"] as! String
let pointDetails = post["PlaceDetails"] as! String
let thePinsLocation = CLLocationCoordinate2DMake(point.latitude, point.longitude)
pinAnnotation.setCoordinate(thePinsLocation)
pinAnnotation.title = pointName
pinAnnotation.subtitle = pointDetails
self.nmapview.addAnnotation(pinAnnotation)
}
} else {
// Log details of the failure
// println("Error: \(error)")
}
}
}
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
if annotation is PinAnnotation {
if annotation is MKUserLocation {
//return nil so map view draws "blue dot" for standard user location
return nil
}
let reuseID = "myPin"
var pinAnnotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseID) as? MKPinAnnotationView
if pinAnnotationView == nil {
pinAnnotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseID)
pinAnnotationView!.pinColor = .Purple
pinAnnotationView!.canShowCallout = true
pinAnnotationView!.animatesDrop = true
pinAnnotationView!.rightCalloutAccessoryView = UIButton.buttonWithType(.DetailDisclosure) as! UIButton
} else {
pinAnnotationView!.annotation = annotation
}
return pinAnnotationView
}
return nil
}
func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!) {
if control == view.rightCalloutAccessoryView{
performSegueWithIdentifier("infoViewController", sender: self)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
我还为“PinAnnotation”创建了一个类，用于引脚。不确定是否多余，但一些关于该主题的教程在必要时提出了它。
import UIKit
import MapKit
import UIKit
class PinAnnotation: NSObject, MKAnnotation {
private var coord: CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: 90.0, longitude: 0.0)
var coordinate: CLLocationCoordinate2D {
get {
return coord
}
}
var title: String = "North Pole"
var subtitle: String = "Santa's house"
func setCoordinate(newCoordinate: CLLocationCoordinate2D) {
self.coord = newCoordinate
}
}