如何解决快速将数据从一类传递到另一类
我有一个应用程序，用户在其中拍照，然后他用这张照片在地图上创建注释，照片必须转移到ImageAnnotation类，然后必须在地图上创建图钉
import UIKit
import MapKit
import CoreLocation
import Firebase
class MapViewController: UIViewController,CLLocationManagerDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate {
@IBOutlet weak var MapButton: UITabBarItem!
@IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
var currentLocation: CLLocation!
let regionInMeters: Double = 10000
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
navigationController?.isNavigationBarHidden = true
let db = Firestore.firestore()
db.collection("locations").getDocuments() { [self] (querySnapshot,err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
if let coords = document.get("pinLocation") {
let point = coords as! GeoPoint
let lat = point.latitude
let lon = point.longitude
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: lat,longitude: lon)
mapView.addAnnotation(annotation)
}
}
}
}
}
override func viewDiddisappear(_ animated: Bool) {
super.viewDiddisappear(animated)
navigationController?.isNavigationBarHidden = false
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
checkLocationServices()
locationManager.delegate = self
}
func setupLocationManager() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
}
func centerViewOnUserLocation() {
if let location = locationManager.location?.coordinate {
let region = MKCoordinateRegion.init(center: location,latitudinalMeters: regionInMeters,longitudinalMeters: regionInMeters)
mapView.setRegion(region,animated: true)
}
}
func checkLocationServices() {
if CLLocationManager.locationServicesEnabled() {
setupLocationManager()
checkLocationAuthorization()
} else {
}
}
func checkLocationAuthorization() {
switch CLLocationManager.authorizationStatus() {
case .authorizedWhenInUse:
mapView.showsUserLocation = true
centerViewOnUserLocation()
locationManager.startUpdatingLocation()
break
case .denied:
break
case .notDetermined:
locationManager.requestWhenInUseAuthorization()
case .restricted:
break
case .authorizedAlways:
break
}
}
@IBAction func pluspressed(_ sender: UIButton) {
// guard let currLoc = locationManager.location else { return }
currentLocation = locationManager.location
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: currentLocation.coordinate.latitude,longitude: currentLocation.coordinate.longitude)
mapView.addAnnotation(annotation)
let picker = UIImagePickerController()
picker.sourceType = .camera
picker.delegate = self
present(picker,animated: true)
func mapView(_ mapView: MKMapView,viewFor annotation: MKAnnotation) -> MKAnnotationView? {
if annotation.isKind(of: MKUserLocation.self) { //Handle user location annotation..
return nil //Default is to let the system handle it.
}
if !annotation.isKind(of: ImageAnnotation.self) { //Handle non-ImageAnnotations..
var pinAnnotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "DefaultPinView")
if pinAnnotationView == nil {
pinAnnotationView = MKPinAnnotationView(annotation: annotation,reuseIdentifier: "DefaultPinView")
}
return pinAnnotationView
}
//Handle ImageAnnotations..
var view: ImageAnnotationView? = mapView.dequeueReusableAnnotationView(withIdentifier: "imageAnnotation") as? ImageAnnotationView
if view == nil {
view = ImageAnnotationView(annotation: annotation,reuseIdentifier: "imageAnnotation")
}
let annotation = annotation as! ImageAnnotation
view?.image = annotation.image
view?.annotation = annotation
return view
}
}
func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
// guard let location = locations.last else { return }
// let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude,longitude: location.coordinate.longitude)
// let region = MKCoordinateRegion.init(center: center,longitudinalMeters: regionInMeters)
// mapView.setRegion(region,animated: true)
}
func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
checkLocationAuthorization()
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true,completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediawithInfo info: [UIImagePickerController.InfoKey : Any]) {
guard let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage else {
return
}
}
}
class ImageAnnotation : NSObject,MKAnnotation {
var coordinate: CLLocationCoordinate2D
var image: UIImage?
var color: UIColor?
override init() {
self.coordinate = CLLocationCoordinate2D()
self.image = ///// Here must go the image from imagePickerController
self.color = UIColor.systemGreen
}
}
class ImageAnnotationView: MKAnnotationView {
private var imageView: UIImageView!
override init(annotation: MKAnnotation?,reuseIdentifier: String?) {
super.init(annotation: annotation,reuseIdentifier: reuseIdentifier)
self.frame = CGRect(x: 0,y: 0,width: 20,height: 20)
self.imageView = UIImageView(frame: CGRect(x: 0,height: 20))
self.addSubview(self.imageView)
self.imageView.layer.cornerRadius = 25
self.imageView.layer.masksToBounds = true
}
override var image: UIImage? {
get {
return self.imageView.image
}
set {
self.imageView.image = newValue
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
解决方法
您发布了一堆与您的问题无关的代码。您应该将其范围缩小到特定于问题的代码（地图视图控制器定义的类定义，以及plusPressed IBAction方法，图像选择器委托方法，地图视图委托方法以及自定义批注的类和方法和注释视图类。
您还没有正确设置代码格式。我编辑了您的问题，并将所有代码放入三个反引号中，以便正确显示。
您的代码将无法正常运行。如果您的自定义plusPressed()对象，则您的MKPointAnnotation方法将创建一个ImageAnnotation对象。您的plusPressed()方法应创建并返回一个ImageAnnotation对象。
您将mapView(_:viewFor:)方法嵌套在plusPressed()方法内，这没有任何意义。您希望mapView(_:viewFor:)位于视图控制器类的顶层（或地图视图委托的任何类。在您的情况下，这就是视图控制器。）
您应该让plusPressed()调用图像选择器，并且只有在用户选择图像并按OK的情况下，才能在地图上添加一个ImageAnnotation。 （您已将代码放入图像选择器的didFinishPickingMediaWithInfo方法中，该方法将获取用户选择的图像，使用它来创建ImageAnnotation，并将该注释添加到地图中。）
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