ios - 使用索引在annotationView中显示文本数组

Question

我无法显示变量中的所有地址

var allAddress: [Address] = []

在这个变量中，我从firebase获取少量地址，并且我想在我的annotationView中显示所有地址，但是当我尝试显示所有地址，我在所有 annotationView 中只看到一个地址，但如果我使用 for..in.. index 进行打印，我会看到 index0>、index1、index2、index3 以及其他...以及如果我打印此:

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

我得到了 firebase 中的所有地址，总共 6。

它打印我的索引和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

如何显示我的 centerInfo.text 中的所有地址？

请检查.gif，它在所有annotationView上显示相同的地址

附注在annotation.title中不需要使用，我不适合

已更新。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

从您的代码来看，您正在使用相同的 UILabel对于所有注释和循环，您将设置 text相同的属性UILabel每次。这就是为什么它显示最后一个 address所有注释。

尝试分配一个单独的 UILabel对于每个注释并设置 text属性到指定address