我一直在寻找两天，我坚持这个错误：
致命错误：在展开Optional值时意外发现nil （LLDB）
当我尝试注释从Firebase中提取的纬度/经度数据数组时会发生这种情况。
我能够使用相同的数据成功地在UITable视图中显示，但问题是当我尝试将该数据注释到地图时。
目标：一次多个注释。让每个存储在Firebase中的用户都可以在地图上注释，使用lat / long firebase为他们提供的任何内容。
我读过，也许我没有初始化地图视图。但我能够成功添加一个注释。
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
var mapView: MKMapView!
var userPinView: MKAnnotationView?
var locationManager: CLLocationManager = CLLocationManager()
var startLocation: CLLocationManager!
var latitude: String?
var longitude: String?
var loc: String?
let cellId = "cellId"
let pinId = "pinId"
var users = [User]()
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Logout", style: .plain, target: self, action: #selector(handlelogout))
navigationItem.leftBarButtonItem?.tintColor = UIColor.purple
//navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Cast", style: .plain, target: self, action: #selector( handleStoreUserLocation))
var rightCastBarButtonItem: UIBarButtonItem = UIBarButtonItem(title: "Cast", style: .plain, target: self, action: #selector( handleStoreUserLocation))
var rightWhoIsCastingListBarButton: UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.search, target: self, action: #selector(ViewController.castListTapped))
self.navigationItem.setRightBarButtonItems([rightCastBarButtonItem, rightWhoIsCastingListBarButton], animated: true)
navigationItem.rightBarButtonItem?.tintColor = UIColor.purple
checkIfUserIsLoggedIn()
fetchAllBroadcasts()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
startLocation = nil
}
//this function will grab the current users location and display it as long and lat numbers. Firebase/GEOFire will then need to reference these coordinates when broadcasting location to other users.
func locationManager(_ manager: CLLocationManager,
didUpdateLocations locations: [CLLocation])
{
let latestLocation: CLLocation = locations[locations.count - 1]
latitude = String(format: "%.4f",
latestLocation.coordinate.latitude)
longitude = String(format: "%.4f",
latestLocation.coordinate.longitude)
// print(latitude, longitude)
}
//this grabs the logged in user Name and displays it in the center nav bar on main screen.
func checkIfUserIsLoggedIn() {
if FIRAuth.auth()?.currentUser?.uid == nil {
perform(#selector(handlelogout), with: nil, afterDelay: 0)
} else {
let uid = FIRAuth.auth()?.currentUser?.uid
FIRDatabase.database().reference().child("users").child(uid!).observe(.value, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
self.navigationItem.title = dictionary ["name"] as? String
}
}, withCancel: nil)
}
//adtional set up after load for MAP
var mapView = MKMapView()
//set map and grab user location
mapView.showsUserLocation = true
// mapView.showAnnotations([MKAnnotation], animated: true)
mapView.mapType = .standard
mapView.frame = view.frame
mapView.tintColor = UIColor.purple
mapView.delegate = self
view.addSubview(mapView)
//******Defalut Map Location********
var location = CLLocationCoordinate2D(
latitude: 49.2810,
longitude: -123.0733
)
//tell the map what the area spanned by the region is
var span = MKCoordinateSpanMake(0.2, 0.2)
//define the region
var region = MKCoordinateRegion(center: location, span: span)
//set region
mapView.setRegion(region, animated: true)
// annotations for the map. this is based of the dedault location above.
// var annotation = MKPointAnnotation()
//annotation.coordinate = location
//annotation.title = "Gayge HQ"
//annotation.subtitle = "oh, hello!"
//mapView.addAnnotation(annotation)
}
//temporary "logout" function . this will later be hidden in slide out menu
func handlelogout (){
do{
try FIRAuth.auth()?.signOut()
} catch let logOutError {
print(logOutError)
}
let loginController = LoginController()
//call the constant loginController that will call the loginController.swift file
present(loginController, animated: true, completion: nil)
}
func handleRightSlideMenu (){
}
func setUpNavBarWithUser (){
}
//*****NEEDS WORK TO FECTH ALL USER LOCATIONS FROM DICTIONARY AND THEN ANNOTATE EACH USER ON THE MAP******
func fetchAllBroadcasts() {
FIRDatabase.database().reference().child("users").observe(.childAdded, with: {(snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject?] {
let user = User()
user.setValuesForKeys(dictionary)
self.users.append(user)
//this will crash because of background thread so lets use dispatch_async to fix
DispatchQueue.main.async(){
self.mapView
}
var locationArray: [CLLocationCoordinate2D] = []
var longDouble = CLLocationDegrees(user.long!)
var latDouble = CLLocationDegrees(user.lat!)
var userBroadcastLocations = CLLocationCoordinate2D(
latitude: (latDouble)!, longitude: (longDouble)!) //array of user long and lat
locationArray.append(userBroadcastLocations)
self.userPinView?.annotation
locationArray.append(userBroadcastLocations)
var annotation = MKPointAnnotation()
annotation.coordinate = userBroadcastLocations
annotation.title = "title"
annotation.subtitle = "testing"
//self.mapView.addAnnotations([locationArray.MKPinAnnotation])
self.mapView.showAnnotations([locationArray as! MKAnnotation], animated: true)
}
}, withCancel: nil)
}
//launch a list view of all users broadcasting via seperate viewController (BroadcastListController)
func castListTapped(send: UIButton){
let broadcastListController = BroadcastListController()
let navController = UINavigationController(rootViewController: broadcastListController)
present(navController, animated: true, completion: nil)
}
func handleStoreUserLocation(){
let uid = FIRAuth.auth()?.currentUser?.uid
let ref = FIRDatabase.database().reference().child("users").child(uid!)
let childRef = ref.childByAutoId()
if latitude == nil && longitude == nil {
let values = ["lat": 0, "long": 0]
ref.updateChildValues(values)
}else{
let values = ["lat": latitude, "long": longitude]
ref.updateChildValues(values)
}
}
}
我会说实话，我可能已经阅读了答案，问题是答案是如此先进，以至于我无法分辨出什么适用于我的代码。因此，这就是我寻求支持的原因。谢谢你所能做的一切。