ios - 如何在mapVIew中添加多重标注

Question

我有 ma​​pView 和来自 firebase 的地址。现在我只能在 ma​​pView 中添加一个注释，但是在 print("Address (self.allAddresses)") 中我得到了三个地址:

地址 Москва, Пресненская набережная д.8, квартира 195, подъезд 94

地址 Москва, ул。 Правды д.24 строение 3

地址 Москва,ул.Электрозаводская д.21

如何添加三个或更多注释？

我的火力基地:

{
  «Address» : {
    «AddressOne» : {
      "address" : "Москва, Пресненская набережная д.8, квартира 195, подъезд 94",
    },
    "AddressTwo» : {
      "address" : "Москва, ул. Правды д.24 строение 3",
    },
    "AddressThree» : {
      "address" : "Москва,ул.Электрозаводская д.21",
    }
  }
}

还有我的代码:

class AddressesMapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    @IBOutlet weak var mapView: MKMapView!

    var allAddresses: String = ""

    var count = 0

    let geocoder = CLGeocoder()

    var addressRef: DatabaseReference!

    override func viewDidLoad() {
        super.viewDidLoad()

        addressRef = Database.database().reference(withPath: "Address")

        loadAddressFromFirebase()

    }
    func loadAddressFromFirebase() {

        addressRef.observe(.value, with: { (snapshot) in

            for address in snapshot.children.allObjects as! [DataSnapshot] {

                let value = address.value as! NSDictionary

                self.allAddresses = value["address"] as? String ?? ""

                print("Address \(self.allAddresses)")

                if self.count < self.allAddresses.count {

                    let addresses = self.allAddresses

                    self.geocoder.geocodeAddressString(addresses, completionHandler: { (placemarks, error) in

                        print("Address - \(addresses)")

                        guard error == nil else { return }

                        guard let placemarks = placemarks else { return }

                        if let placemark = placemarks.first {

                            self.mapView.addAnnotation(MKPlacemark(placemark: placemark))

                        }

                        self.count += 1
                        print("Count - \(self.count)")
                    })
                }   
            }  
        }) 
    }
}

Answer 1

• 尝试在“for”循环中分配 geoCoder。

• 调用geocoder.cancelGeocode()方法。

          let geocoder = CLGeocoder()
          geocoder.geocodeAddressString(addresses, completionHandler: { (placemarks, error) in
  
              print("Address - \(addresses)")
  
              guard error == nil else { return }
  
              guard let placemarks = placemarks else { return }
  
              if let placemark = placemarks.first {
  
                  self.mapView.addAnnotation(MKPlacemark(placemark: placemark))
  
              }
  
              self.count += 1
              print("Count - \(self.count)")
              geocoder.cancelGeocode()
          })