因此，我试图使用Firebase创建Uber的克隆，但我的MapViewController中不断出现错误这是我的代码：
import UIKit
import MapKit
import CoreLocation
class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
@IBOutlet weak var callUberBtn: UIButton!
@IBOutlet weak var myMap: MKMapView!
private var locationManager = CLLocationManager();
private var userLocation: CLLocationCoordinate2D?;
private var driverLocation: CLLocationCoordinate2D?;
private var timer = Timer();
private var canCallUber = true;
private var riderCanceledRequest = false;
private var appStartedForTheFirstTime = true;
override func viewDidLoad() {
super.viewDidLoad()
initializeLocationManager();
UberHandler.Instance.observeMessagesForRider();
UberHandler.Instance.delegate = self; //Cannot assign value of type 'mapViewController' to type 'UberController?'
}
private func initializeLocationManager() {
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.requestWhenInUseAuthorization();
locationManager.startUpdatingLocation();
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
// if we have the coordinates from the manager
if let location = locationManager.location?.coordinate {
userLocation = CLLocationCoordinate2D(latitude: location.latitude, longitude: location.longitude)
let region = MKCoordinateRegion(center: userLocation!, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01));
myMap.setRegion(region, animated: true);
myMap.removeAnnotations(myMap.annotations);
if driverLocation != nil {
if !canCallUber {
let driverAnnotation = MKPointAnnotation();
driverAnnotation.coordinate = driverLocation!;
driverAnnotation.title = "Driver Location";
myMap.addAnnotation(driverAnnotation);
}
}
let annotation = MKPointAnnotation();
annotation.coordinate = userLocation!;
annotation.title = "Drivers Location";
myMap.addAnnotation(annotation);
}
}
func updateRidersLocation() {
UberHandler.Instance.updateRiderLocation(lat: userLocation!.latitude, long: userLocation!.longitude);
}
func canCallUber(delegateCalled: Bool) {
if delegateCalled {
callUberBtn.setTitle("Cancel Uber", for: UIControlState.normal);
canCallUber = false;
} else {
callUberBtn.setTitle("Call Uber", for: UIControlState.normal);
canCallUber = true;
}
}
func driverAcceptedRequest(requestAccepted: Bool, driverName: String) {
if !riderCanceledRequest {
if requestAccepted {
alertTheUser(title: "Uber Accepted", message: "\(driverName) Accepted Your Uber Request")
} else {
UberHandler.Instance.cancelUber();
timer.invalidate();
alertTheUser(title: "Uber Canceled", message: "\(driverName) Canceled Uber Request")
}
}
riderCanceledRequest = false;
}
func updateDriversLocation(lat: Double, long: Double) {
driverLocation = CLLocationCoordinate2D(latitude: lat, longitude: long);
}
@IBAction func callUber(_ sender: Any) {
if userLocation != nil {
if canCallUber {
UberHandler.Instance.requestUber(latitude: Double(userLocation!.latitude), longitude: Double(userLocation!.longitude))
timer = Timer.scheduledTimer(timeInterval: TimeInterval(10), target: self, selector: #selector(MapViewController.updateRidersLocation), userInfo: nil, repeats: true);
} else {
riderCanceledRequest = true;
UberHandler.Instance.cancelUber();
timer.invalidate();
}
}
}
private func alertTheUser(title: String, message: String) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert);
let ok = UIAlertAction(title: "OK", style: .default, handler: nil);
alert.addAction(ok);
present(alert, animated: true, completion: nil);
}
}
UberController?是在另一个Swift文件中声明的，这是该文件的代码：import Foundation
import FirebaseDatabase
protocol UberController: class {
func canCallUber(delegateCalled: Bool);
func driverAcceptedRequest(requestAccepted: Bool, driverName: String);
func updateDriversLocation(lat: Double, long: Double);
}
class UberHandler {
private static let _instance = UberHandler();
weak var delegate: UberController?;
var rider = "";
var driver = "";
var rider_id = "";
static var Instance: UberHandler {
return _instance;
}
func observeMessagesForRider() {
// RIDER REQUESTED UBER
DBProvider.Instance.requestRef.observe(DataEventType.childAdded) { (snapshot: DataSnapshot) in
if let data = snapshot.value as? NSDictionary {
if let name = data[Constants.NAME] as? String {
if name == self.rider {
self.rider_id = snapshot.key;
self.delegate?.canCallUber(delegateCalled: true);
}
}
}
}
// RIDER CANCELED UBER
DBProvider.Instance.requestRef.observe(DataEventType.childRemoved) { (snapshot: DataSnapshot) in
if let data = snapshot.value as? NSDictionary {
if let name = data[Constants.NAME] as? String {
if name == self.rider {
self.delegate?.canCallUber(delegateCalled: false);
}
}
}
}
// DRIVER ACCEPTED UBER
DBProvider.Instance.requestAcceptedRef.observe(DataEventType.childAdded) { (snapshot: DataSnapshot) in
if let data = snapshot.value as? NSDictionary {
if let name = data[Constants.NAME] as? String {
if self.driver == "" {
self.driver = name;
self.delegate?.driverAcceptedRequest(requestAccepted: true, driverName: self.driver);
}
}
}
}
// DRIVER CANCELED UBER
DBProvider.Instance.requestAcceptedRef.observe(DataEventType.childRemoved) { (snapshot:DataSnapshot) in
if let data = snapshot.value as? NSDictionary {
if let name = data[Constants.NAME] as? String {
if name == self.driver {
self.driver = "";
self.delegate?.driverAcceptedRequest(requestAccepted: false, driverName: name);
}
}
}
}
// DRIVER UPDATING LOCATION
DBProvider.Instance.requestAcceptedRef.observe(DataEventType.childChanged) { (snapshot: DataSnapshot) in
if let data = snapshot.value as? NSDictionary {
if let name = data[Constants.NAME] as? String {
if name == self.driver {
if let lat = data[Constants.LATITUDE] as? Double {
if let long = data[Constants.LONGITUDE] as? Double {
self.delegate?.updateDriversLocation(lat: lat, long: long);
}
}
}
}
}
}
}
func requestUber(latitude: Double, longitude: Double) {
let data: Dictionary<String, Any> = [Constants.NAME: rider, Constants.LATITUDE: latitude, Constants.LONGITUDE: longitude];
DBProvider.Instance.requestRef.childByAutoId().setValue(data);
} // request uber
func cancelUber() {
DBProvider.Instance.requestRef.child(rider_id).removeValue();
}
func updateRiderLocation(lat: Double, long: Double) {
DBProvider.Instance.requestRef.child(rider_id).updateChildValues([Constants.LATITUDE: lat, Constants.LONGITUDE: long]);
}
}
我的错误是：
Cannot assign value of type 'mapViewController' to type 'UberController?'中的mapViewController。我不知道我做错了什么。有什么想法吗？ 最佳答案
你必须声明你的MapViewController符合UberController协议，就像你声明符合MapViewDelegate和CLLocationManagerDelegate协议一样。
或者：
class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate, UberController {
...
}
或者，更好的是：
class MapViewController: UIViewController {
...
}
extension MapViewController: MKMapViewDelegate {
// MKMapViewDelegate methods here
}
extension MapViewController: CLLocationManagerDelegate {
// CLLocationManagerDelegate methods here
}
extension MapViewController: UberController {
// UberController methods here
}
关于ios - 无法将类型“MapViewController”的值分配给类型“UberController？”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45332778/