Question

我无法显示变量中的所有地址

var allAddress: [Address] = []

在变量中，我从 firebase 获取少量地址，我想在 annotationView 中显示所有地址，但是当我尝试显示所有地址我只看到所有 annotationView 中的一个地址，但如果我打印我的使用for..in .. 索引我看到 index0 ， index1 ， index2 ， index3 等......如果我打印出来的话：

print("address - \(allAddress[index].address)")

我获得 firebase 中的所有地址，其总数 6 。

打印我的索引和 allAddress [index] .address

index 1
address - Москва, ул. Правды д.24, строение 3
index 2
address - Москва, ул.Электрозаводская д.21
index 3
address - Москва, ул.Бутырская д.8
index 4
address - Москва, 2-Я Звенигородская улица 12 строение 21
index 5
address - Москва, Николоямская 52, стр. 1

这是我的代码：

let centerInfo = UILabel(frame: CGRect(x: 0, y: 0, width: 150, height: 100))
    for index in 0..<allAddress.count {
        print("index \(index)")
        centerInfo.text = allAddress[index].address
        centerInfo.numberOfLines = 0
        centerInfo.lineBreakMode = .byWordWrapping

        print("address - \(allAddress[index].address)")
    }
    annotationView?.detailCalloutAccessoryView = centerInfo

我如何在centerInfo.text显示所有地址？

请检查.gif，它在所有annotationView上显示相同的地址

P.S。在annotation.title中不需要使用，我不适合

已更新即可。所有代码：

class AllAddressMapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

@IBOutlet weak var mapView: MKMapView!

var allAddress: [Address] = []

var studioRef: DatabaseReference!

override func viewDidLoad() {
    super.viewDidLoad()

    studioRef = Database.database().reference(withPath: "Photo1")

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

        for imageSnap in snapshot.children {

            let studioObj = Studio(snapshot: imageSnap as! DataSnapshot)

            self.allAddress.append(studioObj)

            for index in 0..<self.allAddress.count {

                let geocoder = CLGeocoder()

                geocoder.geocodeAddressString(self.allAddress[index].address, completionHandler: { (placemarks, error) in

                    guard error == nil else { return }

                    guard let placemarks = placemarks else { return }

                    if let placemark = placemarks.first {

                        let annotation = MKPointAnnotation()

                        guard let address = placemark.location else { return }
                        annotation.coordinate = address.coordinate

                        self.mapView.addAnnotation(annotation)

                    }

                    geocoder.cancelGeocode()

                })

            }

        }

    })

    mapView.delegate = self
    mapView.mapType = .standard
    mapView.isZoomEnabled = true
    mapView.isScrollEnabled = true

}

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    guard !(annotation is MKUserLocation) else { return nil }

    let annotationID = "PinMap"
    var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationID) as? MKPinAnnotationView

    if annotationView == nil {
        annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: annotationID)
        annotationView?.canShowCallout = true
    } else {
        annotationView?.annotation = annotation
    }

    let leftImageNavigationButton = UIImage(named: "auto")
    let tintedColorleftImageNavigationButton = leftImageNavigationButton?.withRenderingMode(.alwaysTemplate)
    let leftNavigationButton = UIButton(type: .custom)
    leftNavigationButton.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
    leftNavigationButton.setImage(tintedColorleftImageNavigationButton, for: UIControlState())
    leftNavigationButton.tintColor = #colorLiteral(red: 0, green: 0.4784313725, blue: 1, alpha: 1)
    annotationView?.leftCalloutAccessoryView = leftNavigationButton

    let rightButtonInfo = UIButton(type: .detailDisclosure)
    annotationView?.rightCalloutAccessoryView = rightButtonInfo

    let centerInfo = UILabel(frame: CGRect(x: 0, y: 0, width: 150, height: 100))
    for index in 0..<allAddress.count {
        print("index \(index)")
        centerInfo.text = allAddress[index].address
        centerInfo.numberOfLines = 0
        centerInfo.lineBreakMode = .byWordWrapping

        print("address - \(allAddress[index].address)")
    }
    annotationView?.detailCalloutAccessoryView = centerInfo

    annotationView?.calloutOffset = CGPoint(x: -8, y: 0) 

    return annotationView

}

}

Answer 1

从您的代码看，您对所有注释使用相同的UILabel，并且在循环中每次都设置相同text的{{1}}属性。这就是为什么它显示所有注释的最后UILabel。

尝试为每个注释分配一个单独的address，并将UILabel属性设置为指定的text

Answer 2

好吧，我的想法是在你的地图上获得所有注释，并尝试找到正确的注释索引，将其重用到你的allAddress数组中：

var indexValue = 0
    for annotationInMap in mapView.annotations {

        if annotation == annotationInMap {
           let centerInfo = UILabel(frame: CGRect(x: 0, y: 0, width: 150, height: 100))

            centerInfo.text = allAddress[indexValue].address
            centerInfo.numberOfLines = 0
            centerInfo.lineBreakMode = .byWordWrapping

            annotationView?.detailCalloutAccessoryView = centerInfo
        }


        indexValue = indexValue + 1
    }

Answer 3

如何在viewDidLoad中将地址设置为annotation.title，并在viewFor方法中获取annotation.title。

class AllAddressMapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    @IBOutlet weak var mapView: MKMapView!

    var allAddress: [Address] = []

    var studioRef: DatabaseReference!

    override func viewDidLoad() {
        super.viewDidLoad()

        studioRef = Database.database().reference(withPath: "Photo1")

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

            for imageSnap in snapshot.children {

                let studioObj = Studio(snapshot: imageSnap as! DataSnapshot)

                self.allAddress.append(studioObj)

                for index in 0..<self.allAddress.count {

                    let geocoder = CLGeocoder()

                    geocoder.geocodeAddressString(self.allAddress[index].address, completionHandler: { (placemarks, error) in

                        guard error == nil else { return }

                        guard let placemarks = placemarks else { return }

                        if let placemark = placemarks.first {

                            let annotation = MKPointAnnotation()

                            guard let address = placemark.location else { return }
                            annotation.coordinate = address.coordinate
                            annotation.title = self.allAddress[index].address

                            self.mapView.addAnnotation(annotation)

                        }

                        geocoder.cancelGeocode()

                    })

                }

            }

        })

        mapView.delegate = self
        mapView.mapType = .standard
        mapView.isZoomEnabled = true
        mapView.isScrollEnabled = true

    }

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

        guard !(annotation is MKUserLocation) else { return nil }

        let annotationID = "PinMap"
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationID) as? MKPinAnnotationView

        if annotationView == nil {
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: annotationID)
            annotationView?.canShowCallout = true
        } else {
            annotationView?.annotation = annotation
        }

        let leftImageNavigationButton = UIImage(named: "auto")
        let tintedColorleftImageNavigationButton = leftImageNavigationButton?.withRenderingMode(.alwaysTemplate)
        let leftNavigationButton = UIButton(type: .custom)
        leftNavigationButton.frame = CGRect(x: 0, y: 0, width: 40, height: 40)
        leftNavigationButton.setImage(tintedColorleftImageNavigationButton, for: UIControlState())
        leftNavigationButton.tintColor = #colorLiteral(red: 0, green: 0.4784313725, blue: 1, alpha: 1)
        annotationView?.leftCalloutAccessoryView = leftNavigationButton

        let rightButtonInfo = UIButton(type: .detailDisclosure)
        annotationView?.rightCalloutAccessoryView = rightButtonInfo

        let centerInfo = UILabel(frame: CGRect(x: 0, y: 0, width: 150, height: 100))
        for index in 0..<allAddress.count {
            print("index \(index)")
            centerInfo.text = annotation.title
            centerInfo.numberOfLines = 0
            centerInfo.lineBreakMode = .byWordWrapping

            print("address - \(allAddress[index].address)")
        }
        annotationView?.detailCalloutAccessoryView = centerInfo

        annotationView?.calloutOffset = CGPoint(x: -8, y: 0)

        return annotationView

}

使用索引在annotationView中显示文本数组

3 个答案: