How to load a Viewcontroller with Annotation information - ios

Question

I'm building a application that allows people to post annotations on a map and you can click on the detail closure of the annotation and it loads a ViewController with the image and the subtitle information but when I try to load the image and subtitle in the viewDidLoad method of the detailVC it says it's nil
Here's my Annotation code:
extension ViewController: MKMapViewDelegate {
private struct Constants{
static let identifier = "pin"
static let LeftCalloutFrame = CGRect(x:0, y:0, width: 59, height: 59)
static let ShowPinSegueIdentifier = "showDetail"
}
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
if let annotation = annotation as? PingAnnotation {
var view = mapView.dequeueReusableAnnotationViewWithIdentifier(Constants.identifier) as? MKPinAnnotationView
if view == nil {
view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: Constants.identifier)
view?.canShowCallout = true
} else {
view!.annotation = annotation
}
view!.calloutOffset = CGPoint(x: -5, y: 5)
view!.leftCalloutAccessoryView = UIImageView(frame: Constants.LeftCalloutFrame)
view!.rightCalloutAccessoryView = UIButton(type: .DetailDisclosure) as UIView
return view
}
return nil
}
func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
if let thumbnailImageView = view.leftCalloutAccessoryView as? UIImageView {
if let pingAnnotation = view.annotation as? PingAnnotation{
thumbnailImageView.image = pingAnnotation.image
}
}
}
func mapView(mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
performSegueWithIdentifier(Constants.ShowPinSegueIdentifier, sender: view)
}
}
Annotation code:
class PingAnnotation: NSObject, MKAnnotation {
var coordinate : CLLocationCoordinate2D
var title: String?
var subtitle: String?
var image : UIImage?
init(coordinate: CLLocationCoordinate2D, title: String?, subtitle: String?, image: UIImage?) {
self.coordinate = coordinate
self.title = title
self.subtitle = subtitle
self.image = image
}
}
Detail VC Code:
import UIKit
class DetailPingVC: UIViewController {
var ping : PingAnnotation!
#IBOutlet var pingImage: UIImageView!
#IBOutlet var pingDesc: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
pingImage.image = ping.image //shows as nil when ran
pingDesc.text = ping.subtitle //shows as nil when ran
}
#IBAction func pingBtnPressed(sender: AnyObject) {
}
#IBAction func backBtnPressed(sender: AnyObject) {
dismissViewControllerAnimated(true, completion: nil)
}
}
EDIT:
I tried using prepareForSegue but the values still come out nil
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destViewController: DetailPingVC = segue.destinationViewController as! DetailPingVC
destViewController.pingImage.image = ping.image
destViewController.pingDesc.text = ping.subtitle
}

Answer 1

Got it! Basically what I did was add a variable of type string and a variable of type UIImage to the DetailVC and then my prepareForSegue in my viewController looks as so:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destViewController: DetailPingVC = segue.destinationViewController as! DetailPingVC
destViewController.descText = postTextField.text!
destViewController.detailImage = pickImage.image!
}
then in the viewDidLoad of the Detail VC you set the Outlets to the variables you set up earlier.