当iImage的值被打印出来时，它会说：“size{3024，4032}orientation 3 scale 1.000000”，但随后我在下一行得到错误：“fatal error:unexpected found nil while unwrapping an Optional value”。我刚刚得到的图像怎么可能是零？
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let iImage = info[UIImagePickerControllerOriginalImage] as! UIImage
print(iImage)
createEvent(iImage)//where it is saved to cloudkit with location and title
EventPageViewController().eventPic.image = iImage
self.dismiss(animated: true, completion: nil);
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
let eventPageViewController:EventPageViewController = storyboard?.instantiateViewController(withIdentifier: "EventPage") as! EventPageViewController
self.present(eventPageViewController, animated: true, completion: nil)
}
func loadEvent(_ completion: @escaping (_ error:NSError?, _ records:[CKRecord]?) -> Void)
{
let date = NSDate(timeInterval: -60.0 * 180, since: NSDate() as Date)
let predicate = NSPredicate(format: "creationDate > %@", date)
let query = CKQuery(recordType: "Event", predicate: predicate)
CKContainer.default().publicCloudDatabase.perform(query, inZoneWith: nil){
(records, error) in
if error != nil {
print("error fetching events: \(error)")
completion(error as NSError?, nil)
} else {
print("found events")
completion(nil, records)
guard let records = records else {
return
}
for record in records
{
self.drawEvents(record["LocationF"] as! CLLocation, title1: record["StringF"] as! String)
if let asset = record["Picture"] as? CKAsset,
let data = NSData(contentsOf: asset.fileURL),
let image1 = UIImage(data: data as Data)
{
//EventPageViewController().eventPic.image = image1
}
}
}
}
}
func drawEvents(_ loc: CLLocation, title1: String)
{
mapView.delegate = self
let center = CLLocationCoordinate2D(latitude: loc.coordinate.latitude, longitude: loc.coordinate.longitude)
let lat: CLLocationDegrees = center.latitude
let long: CLLocationDegrees = center.longitude
self.pointAnnotation1 = MKPointAnnotation()
self.pointAnnotation1.title = title1
self.pointAnnotation1.subtitle = "Event"
self.pointAnnotation1.coordinate = CLLocationCoordinate2D(latitude: lat, longitude: long)
self.pinAnnotationView = MKPinAnnotationView(annotation: self.pointAnnotation1, reuseIdentifier: nil)
self.mapView.addAnnotation(self.pinAnnotationView.annotation!)
}
最佳答案
这是因为您正在此处创建ViewController的新实例EventPageViewController()。如果此委托方法位于EventPageViewController中，则只需调用self.eventPic.image = iImage。