Question

在重复我的任务之前，请先阅读全文。我在我的应用程序中使用MkMapKit，现在缩小地图时，我必须在集群中显示人物，到目前为止，我已经使用Apple的默认集群类使用this answer对他们进行了编号。现在我不知道如何添加并显示所有带有计数的圆，我知道它应该与半径相关，但是我不知道该怎么做，在下面分享我的代码，希望对您有所帮助赞赏。谢谢还显示了我所做的事情的图片：

这是我的 UserAnnotationClass

class UserAnnotation: NSObject, MKAnnotation {

    let title: String?
    let locationName: String
    let discipline: String
    let coordinate: CLLocationCoordinate2D

    let userProfile: UserProfile!
    let index: Int!
    let memberAnnotations: [UserProfile]!
    init(userProfile: UserProfile, at index: Int) {

        self.title = userProfile.fullName
        self.locationName = (userProfile.locationAddress != nil) ? userProfile.locationAddress : ""
        let userProfilePicture: String = (userProfile.profilePicture == nil || userProfile.profilePicture == "") ? "" : userProfile.profilePicture

        self.discipline = userProfilePicture

       // print("\(userProfile.fullName) \(userProfile.location.dist)")

        if (userProfile.isMapVisibility == true) {
            self.coordinate = CLLocationCoordinate2D(latitude: userProfile.location.lat, longitude: userProfile.location.lon)
        } else {
            self.coordinate = CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0)
        }
        memberAnnotations = [UserProfile]()
        memberAnnotations.append(userProfile)
        self.userProfile = userProfile
        self.index = index

        super.init()
    }

    var subtitle: String? {
        return locationName
    }

    // pinTintColor for disciplines: Sculpture, Plaque, Mural, Monument, other
    var markerTintColor: UIColor  {
        switch discipline {
        case "Monument":
            return .red
        case "Mural":
            return .cyan
        case "Plaque":
            return .blue
        case "Sculpture":
            return .purple
        default:
            return .clear
        }
    }

    // Annotation right callout accessory opens this mapItem in Maps app
    func mapItem() -> MKMapItem {
        let addressDict = [CNPostalAddressStreetKey: subtitle!]
        let placemark = MKPlacemark(coordinate: coordinate, addressDictionary: addressDict)
        let mapItem = MKMapItem(placemark: placemark)
        mapItem.name = title


        return mapItem
    }
}

这是我正在使用的 CLusterViewClass 使它们成簇。

class ClusterView: MKAnnotationView {


    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        let hitView = super.hitTest(point, with: event)
        if (hitView != nil)
        {

            if (hitView?.isKind(of: UIButton.self))! {

                let sender: UIButton = hitView as! UIButton

                sender.sendActions(for: .touchUpInside)

            }
            else {

                self.superview?.bringSubviewToFront(self)
            }
        }
        return hitView
    }
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        let rect = self.bounds
        var isInside: Bool = rect.contains(point)
        if(!isInside)
        {
            for view in self.subviews
            {
                isInside = view.frame.contains(point)
                if isInside
                {
                    break
                }
            }
        }
        return isInside
    }
    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        displayPriority = .defaultHigh
        collisionMode = .circle
        centerOffset = CGPoint(x: 0, y: -10) // Offset center point to animate better with marker annotations
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override var annotation: MKAnnotation? {
        willSet {

            canShowCallout = false

            if let cluster = newValue as? UserAnnotation {
                let renderer = UIGraphicsImageRenderer(size: CGSize(width: 40, height: 40))
                let count = cluster.memberAnnotations.count
                let uniCount = cluster.memberAnnotations.filter { member -> Bool in
                    //Log("Bool  \(member) , \(member.isMapVisibility == false) ")

                    return member.isMapVisibility == true
                }.count
                //Log("COUNTS \(count) , \(uniCount) ❤️")
                image = renderer.image { _ in
                    // Fill full circle with tricycle color
                    if uniCount > 0 {

                        AppTheme.blueColor.setFill()
                        UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 40, height: 40)).fill()

                        // Fill inner circle with white color
                        UIColor.white.setFill()
                        UIBezierPath(ovalIn: CGRect(x: 8, y: 8, width: 24, height: 24)).fill()

                        // Finally draw count text vertically and horizontally centered
                        let attributes = [ NSAttributedString.Key.foregroundColor: UIColor.black,
                                           NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 20)]
                        //let text = "\(count)"
                        let text = "4"
                        let size = text.size(withAttributes: attributes)
                        let rect = CGRect(x: 20 - size.width / 2, y: 20 - size.height / 2, width: size.width, height: size.height)
                        text.draw(in: rect, withAttributes: attributes)
                    }
                }
            }
        }
    }

}

这些是我的一些 MapKit函数

extension FeedsViewController: MKMapViewDelegate {

    //   1
      func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard let annotation = annotation as? UserAnnotation else { return nil }
        // 2
        let identifier = "marker"
        if #available(iOS 11.0, *) {
            var view: ClusterView

            if let dequeuedView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
                as? ClusterView { // 3
                dequeuedView.annotation = annotation
                view = dequeuedView
            } else {
                // 4
                view = ClusterView(annotation: annotation, reuseIdentifier: identifier)
            }
            return view
        } else {
            // Fallback on earlier versions

            return nil
        }

      }
    func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
//        let zoomWidth = mapView.visibleMapRect.size.width
//        let zoomFactor = Int(log2(zoomWidth))
//        print("...REGION DID CHANGE: ZOOM FACTOR \(zoomFactor)")
        let centralLocation = CLLocation(latitude: mapView.centerCoordinate.latitude, longitude:  mapView.centerCoordinate.longitude)

        Log(" Radius - \(self.getRadius(centralLocation: centralLocation))")


    }
    func getRadius(centralLocation: CLLocation) -> Double{
        let topCentralLat:Double = centralLocation.coordinate.latitude -  mapView.region.span.latitudeDelta/2
        let topCentralLocation = CLLocation(latitude: topCentralLat, longitude: centralLocation.coordinate.longitude)
        let radius = centralLocation.distance(from: topCentralLocation)
        return radius / 1000.0 // to convert radius to meters
    }
    func mapView(_ mapView: MKMapView,
                 didSelect view: MKAnnotationView)
    {
        // 1
        if view.annotation is MKUserLocation
        {
            // Don't proceed with custom callout
            return
        }
        // 2
        let annotation = view.annotation as! UserAnnotation

        let detailAnnotationView: UserDetailAnnotationView = UserDetailAnnotationView(frame: CGRect(x: 0, y: 0, width: 320, height: 74))

        let url = (annotation.discipline == "") ? nil : URL(string: annotation.discipline)!
        let range = 0.0..<0.9
        if annotation.userProfile.location.dist != nil {
            if range.contains(annotation.userProfile.location.dist) {
                let kMeters = Measurement(value: annotation.userProfile.location.dist, unit: UnitLength.kilometers)
                let meters = kMeters.converted(to: UnitLength.meters)
                detailAnnotationView.distancelbl.text = "\(String(describing: round(Double(meters.value)))) m Away"

            } else {
                detailAnnotationView.distancelbl.text = "\(String(describing: round(annotation.userProfile.location.dist))) Km Away"
            }
        }

        detailAnnotationView.set(Title: annotation.title!, imageUrl: url) { [weak self] (sender) in
            guard let self = self else { return }
            if self.isOpenChat {

                self.isOpenChat = false

                if annotation.userProfile.channel != "" {

                    self.appDelegate.pubNubAddPushNotifications([annotation.userProfile.channel]) { (status) in

                        print(status.description)
                    }

                    let chatViewController: ChatViewController = self.storyboard?.instantiateViewController(withIdentifier: "ChatViewController") as! ChatViewController

                    chatViewController.userProfile = annotation.userProfile
                    chatViewController.loginUserProfile = self.loginUserProfile
                    self.navigationController?.pushViewController(chatViewController, animated: true)
                }
            }

        }

        detailAnnotationView.center = CGPoint(x: view.bounds.size.width / 2, y: -detailAnnotationView.bounds.size.height*0.52)

        view.addSubview(detailAnnotationView)

        mapView.setCenter((view.annotation?.coordinate)!, animated: true)

//        let calloutView = views?[0] as! CustomCalloutView
//        calloutView.starbucksName.text = starbucksAnnotation.name
//        calloutView.starbucksAddress.text = starbucksAnnotation.address
//        calloutView.starbucksPhone.text = starbucksAnnotation.phone
//        calloutView.starbucksImage.image = starbucksAnnotation.image
//        let button = UIButton(frame: calloutView.starbucksPhone.frame)
//        button.addTarget(self, action: #selector(ViewController.callPhoneNumber(sender:)), for: .touchUpInside)
//        calloutView.addSubview(button)
//        // 3
//        calloutView.center = CGPoint(x: view.bounds.size.width / 2, y: -calloutView.bounds.size.height*0.52)
//        view.addSubview(calloutView)
//        mapView.setCenter((view.annotation?.coordinate)!, animated: true)
    }

    func mapView(_ mapView: MKMapView, didDeselect view: MKAnnotationView) {
        if #available(iOS 11.0, *) {
            if view.isKind(of: ClusterView.self)
            {
                for subview in view.subviews
                {
                    subview.removeFromSuperview()
                }
            }
        } else {
            // Fallback on earlier versions
        }
    }

    func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
                 calloutAccessoryControlTapped control: UIControl) {
//        let location = view.annotation as! UserAnnotation
//        let launchOptions = [MKLaunchOptionsDirectionsModeKey:
//            MKLaunchOptionsDirectionsModeDriving]
//        location.mapItem().openInMaps(launchOptions: launchOptions)
    }
}

这就是我设置mapView的方式。...

fileprivate func setupMapsLayout() {

    if self.userAnnotationList.count > 0 {
    // HereMap
        self.mapView.removeAnnotations(self.userAnnotationList)
    }

    self.mapView.delegate = self
    //    mapView.register(ArtworkMarkerView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
    if #available(iOS 11.0, *) {
        // HereMap
        //self.mapView.register(UserAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
        mapView.register(ClusterView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)
    } else {
        // Fallback on earlier versions
    }

    self.loadInitialData()

    self.mapView.addAnnotations(self.userAnnotationList)
    //self.mapView.topCenterCoordinate()
}

Answer 1

好的，iOS 11及更高版本的解决方案非常简单。您有两个注释视图，一个用于您自己的注释，一个用于注释集群。您的主注释视图仅需在初始化clusteringIdentifier属性时指定annotation：

class UserAnnotationView: MKMarkerAnnotationView {
    static let preferredClusteringIdentifier = Bundle.main.bundleIdentifier! + ".UserAnnotationView"

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        clusteringIdentifier = UserAnnotationView.preferredClusteringIdentifier
        collisionMode = .circle
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override var annotation: MKAnnotation? {
        willSet {
            clusteringIdentifier = UserAnnotationView.preferredClusteringIdentifier
        }
    }
}

并且您的群集注释视图应该仅在其annotation属性更新时更新其图像：

class UserClusterAnnotationView: MKAnnotationView {
    static let preferredClusteringIdentifier = Bundle.main.bundleIdentifier! + ".UserClusterAnnotationView"

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        collisionMode = .circle
        updateImage()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override var annotation: MKAnnotation? { didSet { updateImage() } }

    private func updateImage() {
        if let clusterAnnotation = annotation as? MKClusterAnnotation {
            self.image = image(count: clusterAnnotation.memberAnnotations.count)
        } else {
            self.image = image(count: 1)
        }
    }

    func image(count: Int) -> UIImage {
        let bounds = CGRect(origin: .zero, size: CGSize(width: 40, height: 40))

        let renderer = UIGraphicsImageRenderer(bounds: bounds)
        return renderer.image { _ in
            // Fill full circle with tricycle color
            AppTheme.blueColor.setFill()
            UIBezierPath(ovalIn: bounds).fill()

            // Fill inner circle with white color
            UIColor.white.setFill()
            UIBezierPath(ovalIn: bounds.insetBy(dx: 8, dy: 8)).fill()

            // Finally draw count text vertically and horizontally centered
            let attributes: [NSAttributedString.Key: Any] = [
                .foregroundColor: UIColor.black,
                .font: UIFont.boldSystemFont(ofSize: 20)
            ]

            let text = "\(count)"
            let size = text.size(withAttributes: attributes)
            let origin = CGPoint(x: bounds.midX - size.width / 2, y: bounds.midY - size.height / 2)
            let rect = CGRect(origin: origin, size: size)
            text.draw(in: rect, withAttributes: attributes)
        }
    }
}

然后，您要做的就是注册课程：

mapView.register(UserAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
mapView.register(UserClusterAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)

不需要（{也不希望）实施mapView(_:viewFor:)。但是上面的结果（在缩小和放大时显示默认动画）：

现在，很明显，您可以根据需要修改UserAnnotationView。（您的问题并未表明标准的单用户注释视图的外观）。但是通过设置其clusteringIdentifier并注册一个MKMapViewDefaultClusterAnnotationViewReuseIdentifier，您可以在iOS 11及更高版本中轻松地进行集群。

如果您确实希望使群集注释视图看起来像标准注释视图，则可以为这两个注册相同的注释视图类：

mapView.register(UserClusterAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
mapView.register(UserClusterAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)

但是您必须为集群注释视图提供与我们之前提供给标准注释视图相同的clusteringIdentifier：

class UserClusterAnnotationView: MKAnnotationView {
    static let preferredClusteringIdentifier = Bundle.main.bundleIdentifier! + ".UserClusterAnnotationView"

    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
        clusteringIdentifier = UserClusterAnnotationView.preferredClusteringIdentifier
        collisionMode = .circle
        updateImage()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override var annotation: MKAnnotation? {
        didSet {
            clusteringIdentifier = UserClusterAnnotationView.preferredClusteringIdentifier
            updateImage()
        }
    }

    private func updateImage() {
        if let clusterAnnotation = annotation as? MKClusterAnnotation {
            self.image = image(count: clusterAnnotation.memberAnnotations.count)
        } else {
            self.image = image(count: 1)
        }
    }

    func image(count: Int) -> UIImage {
        let bounds = CGRect(origin: .zero, size: CGSize(width: 40, height: 40))

        let renderer = UIGraphicsImageRenderer(bounds: bounds)
        return renderer.image { _ in
            // Fill full circle with tricycle color
            AppTheme.blueColor.setFill()
            UIBezierPath(ovalIn: bounds).fill()

            // Fill inner circle with white color
            UIColor.white.setFill()
            UIBezierPath(ovalIn: bounds.insetBy(dx: 8, dy: 8)).fill()

            // Finally draw count text vertically and horizontally centered
            let attributes: [NSAttributedString.Key: Any] = [
                .foregroundColor: UIColor.black,
                .font: UIFont.boldSystemFont(ofSize: 20)
            ]

            let text = "\(count)"
            let size = text.size(withAttributes: attributes)
            let origin = CGPoint(x: bounds.midX - size.width / 2, y: bounds.midY - size.height / 2)
            let rect = CGRect(origin: origin, size: size)
            text.draw(in: rect, withAttributes: attributes)
        }
    }
}

结果是：

我个人认为这有点令人困惑，但是如果您要这样做，那是实现它的一种方法。

现在，如果您确实需要支持11之前的iOS版本并且想要进行集群，那么您必须自己完成所有这些集群逻辑（或找第三方库来完成）。 Apple在WWDC 2011 Visualizing Information Geographically with MapKit中展示了如何执行此操作。他们采用的概念是将可见地图划分为网格的概念，如果特定网格中有多个注释，则将其删除并添加单个“集群”注释。它们说明了您甚至可以如何视觉化注释在群集中移入和移出的动画，以便用户可以在放大和缩小时了解发生了什么。这是您入门的一个很好的起点。

这是不平凡的事，因此，对于我是否想自己实现这一点，我会进行漫长而艰难的思考。我要么放弃11之前的iOS版本，要么找到第三方实现（question you reference有很多示例）。

在Swift中缩小地图时，MKMapView没有聚类注释

1 个答案: