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Custom Annotation

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How to pass a photo taken from camera to an annotation????

@IBAction func plusPressed(_ sender: UIButton) {

        let picker = UIImagePickerController()
        picker.sourceType = .camera
        picker.delegate = self
        present(picker, animated: true)
 }

 func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        picker.dismiss(animated: true, completion: nil)

        guard let selectedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage else { return }
}

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
            let annotationView = MKAnnotationView(annotation: pin, reuseIdentifier: "EcoPin")
            let transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
            annotationView.transform = transform
            annotationView.image = selectedImage

            return annotationView
            }

2      

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