当我尝试放置图钉时，我无法将自定义注释加载到我的 map View 中。

import UIKit
import MapKit
import CoreLocation
class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate{
@IBAction func ReportBtn(sender: AnyObject) {
    //MARK: Report Date And Time Details
    let ReportTime = NSDate()
    let TimeStamp = NSDateFormatter()
    TimeStamp.timeStyle = NSDateFormatterStyle.ShortStyle
    TimeStamp.dateStyle = NSDateFormatterStyle.ShortStyle
    TimeStamp.stringFromDate(ReportTime)
    //MARK: Default Point Annotation Begins
    let ReportAnnotation = MKPointAnnotation()
    ReportAnnotation.title = "Annotation Created"
    ReportAnnotation.subtitle = ReportTime.description
    ReportAnnotation.coordinate = locationManager.location!.coordinate
    mapView(MainMap, viewForAnnotation: ReportAnnotation)
    MainMap.addAnnotation(ReportAnnotation)
}

@IBOutlet weak var MainMap: MKMapView!
let locationManager = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()
    self.locationManager.requestWhenInUseAuthorization()
    self.locationManager.delegate = self
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.locationManager.startUpdatingLocation()
    self.MainMap.showsUserLocation = true
}


//MARK: - Location Delegate Methods
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
 let location = locations.last
 let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
 let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.02, longitudeDelta: 0.02 ))
    self.MainMap.setRegion(region, animated: true)
    //self.locationManager.stopUpdatingLocation()
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError){
    print(error.localizedDescription)
}
//MARK:Custom Annotation Begins Here
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    guard !annotation.isKindOfClass(MKUserLocation) else {
        return nil
    }
    /*if annotation.isKindOfClass(MKUserLocation){
        //emty return, guard wasn't cooperating
    }else{
    return nil
    }*/
    let annotationIdentifier = "AnnotationIdentifier"

    var annotationView: MKAnnotationView?
    if let dequeuedAnnotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationIdentifier){
        annotationView = dequeuedAnnotationView
        annotationView?.annotation = annotation
    }
    else{
        let av = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
        av.rightCalloutAccessoryView = UIButton(type: .DetailDisclosure)
        annotationView = av
    }
    if let annotationView = annotationView {
        annotationView.canShowCallout = true
        annotationView.image = UIImage(named: "image.png")
    }
    return annotationView

}
}

补充信息

我确信按钮功能完美无缺。使用上面转储的当前代码，默认的红色引脚注释出现在它应该出现的位置。当我点击图钉时，我指定的描述也毫无问题地出现了。 我在使用此代码时遇到的唯一问题是我无法用我的图像代替无聊的默认红色图钉