ios - 您如何更改 Google Maps 的集群图标？

Question

我有一个 GMSMapView 类型的 Google 地图，并且我在该地图上显示了标记，并且我还为该 mapView 实现了 Google 集群。

所以我真正想要实现的是我想点击特定集群的集群图标和图标更改。但是目前这并没有发生，因为当我点击选定的标记时，只有单个标记会发生变化，而不是集群 Item 会发生变化。

地图上显示的我的集群组

我真正想要达到的目标

我为个人标记实际取得的成就。

所以上面的图像是集群标记我想在该集群项目上呈现一个图标但不幸的是它没有呈现为我无法在GMUClusterManagerDelegate和GMUClusterRendererDelegate的代表中访问的图像。我不知道如何在集群标记的点击操作上更改集群图标。

注意：-我想更改集群项目的集群点击图标并且我已经为选定的单个标记实现了

下面是我到目前为止所做的代码

   override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        propertyMapView.delegate = self
        createListOfPOIItems()
    }

    // MARK : -- Map related functions
//creating POOitems for the map
    func createListOfPOIItems() {
        self.propertyPOIItemList = []
        for index in 0..<self.propertyListModalArray.count {
            let propertylistmodal = self.propertyListModalArray[index]
            if UtilitySharedClass.sharedInstance.isvalidGeoLat(propertylistmodal.propertylat) && UtilitySharedClass.sharedInstance.isvalidGeoLong(propertylistmodal.propertyLong) {
                let coordinate = CLLocationCoordinate2D(latitude: CLLocationDegrees(Float(propertylistmodal.propertylat!)!), longitude: CLLocationDegrees(Float(propertylistmodal.propertyLong!)!))
                if universityLocation == coordinate{
                    continue
                }
                let item = POIItem(position: coordinate, name: propertylistmodal.propertyName ?? "", propertyListModal: propertylistmodal)
                self.propertyPOIItemList?.append(item)
            }
        }
        initiateClustering()
    }

    func initiateClustering() {
        // Set up the cluster manager with the supplied icon generator and
        // renderer.
        let iconGenerator = ClusterIconGenerator()
        let algorithm = GMUNonHierarchicalDistanceBasedAlgorithm()
        let renderer = GMUDefaultClusterRenderer(mapView: propertyMapView,
                                                 clusterIconGenerator: iconGenerator)
        clusterManager = GMUClusterManager(map: propertyMapView, algorithm: algorithm,
                                           renderer: renderer)
        renderer.delegate = self
        renderer.minimumClusterSize = 2
        
        //renderer.animationDuration = 0.2
        
        // Generate and add random items to the cluster manager.
        generateClusterItems()
        
        // Call cluster() after items have been added to perform the clustering
        // and rendering on map.
        clusterManager.cluster()
        
        clusterManager.setDelegate(self, mapDelegate: self)
        
        self.setUniversityLocation()
    }

为地图添加集群

    /// adds property location to the cluster manager.
    private func generateClusterItems() {
        guard let items = self.propertyPOIItemList else { return }
        items.forEach({ (item) in
            clusterManager?.add(item)
            clusterManager?.cluster()
        })
    }

为集群实现委托

extension SearchViewController:  GMSMapViewDelegate, GMUClusterManagerDelegate, GMUClusterRendererDelegate {
    
    func renderer(_ renderer: GMUClusterRenderer, markerFor object: Any) -> GMSMarker? {
        let marker = CustomMarker()
        if let itemMarker = object as? GMUCluster {
            marker.markerType = .clusterType
            marker.markerCount = itemMarker.items.count
        } else if let itemMarker = object as? POIItem {
            marker.markerType = .itemType
            itemMarker.marker = marker
            marker.propertyListModal = itemMarker.propertyListModal
        }
        return marker
    }
    
    func renderer(_ renderer: GMUClusterRenderer, didRenderMarker marker: GMSMarker) {
        if let customMarker = marker as? CustomMarker {
            if customMarker.markerType == .itemType {
                let propertyMarker = createMarkerView(isSelected: customMarker.isSelected)
                propertyMarker.markerPriceLabel.text = customMarker.propertyListModal?.propertyPrice
                marker.icon = propertyMarker.asImage()
                marker.groundAnchor = CGPoint(x: 0.5, y: 1)
            }
        }
    }
    
    // MARK: - GMUClusterManagerDelegate
    func clusterManager(_ clusterManager: GMUClusterManager, didTap cluster: GMUCluster) -> Bool {
        let newCamera = GMSCameraPosition.camera(withTarget: cluster.position,
                                                 zoom: propertyMapView.camera.zoom)
        let update = GMSCameraUpdate.setCamera(newCamera)
        propertyMapView.moveCamera(update)

        isClusterTapped = true

        clusterPropertyList = []
        let properties = cluster.items
        properties.forEach({ (property) in
            if let propertyModal = property as? POIItem, propertyModal.propertyListModal != nil{
                clusterPropertyList.append(propertyModal.propertyListModal!)
            }
        })
        
        if let previousMarker = propertyMapView.selectedMarker as? CustomMarker{
            previousMarker.isSelected = !previousMarker.isSelected
            let propertyMarker = createMarkerView(isSelected: previousMarker.isSelected)
            propertyMarker.markerPriceLabel.text = previousMarker.propertyListModal?.propertyPrice
            previousMarker.icon = propertyMarker.asImage()
        }
        self.propertyMapView.selectedMarker = nil

        self.propertyListContainerForMap.isHidden = false
        self.propertyViewForMapCollectionView.reloadData()
        return true
    }
    
    
    func clusterManager(_ clusterManager: GMUClusterManager, didTap clusterItem: GMUClusterItem) -> Bool {
        let newCamera = GMSCameraPosition.camera(withTarget: clusterItem.position,
                                                 zoom: propertyMapView.camera.zoom)
        let update = GMSCameraUpdate.setCamera(newCamera)
        propertyMapView.moveCamera(update)
        
        if let previousMarker = propertyMapView.selectedMarker as? CustomMarker{
            previousMarker.isSelected = !previousMarker.isSelected
            let propertyMarker = createMarkerView(isSelected: previousMarker.isSelected)
            propertyMarker.markerPriceLabel.text = previousMarker.propertyListModal?.propertyPrice
            previousMarker.icon = propertyMarker.asImage()
        }
        
        let item = clusterItem as? POIItem
        if let tappedMarker = item?.marker as? CustomMarker{
            tappedMarker.isSelected = !tappedMarker.isSelected
            let propertyMarker = createMarkerView(isSelected: tappedMarker.isSelected)
            propertyMarker.markerPriceLabel.text = tappedMarker.propertyListModal?.propertyPrice
            tappedMarker.icon = propertyMarker.asImage()
            propertyMapView.selectedMarker = tappedMarker
        }
        
        isClusterTapped = false
        self.propertyListContainerForMap.isHidden = false
        self.propertyViewForMapCollectionView.reloadData()
        return true
    }
}

我的 POItem 类

import Foundation
import GoogleMapsUtils
import GoogleMaps

class POIItem: NSObject, GMUClusterItem {
    var position: CLLocationCoordinate2D
    var name: String!
    var propertyListModal: PeropertyListModel?
    var marker: GMSMarker?
    
    init(position: CLLocationCoordinate2D, name: String, propertyListModal: PeropertyListModel) {
        self.position = position
        self.name = name
        self.propertyListModal = propertyListModal
    }
}

IconGenerator 的类

import Foundation
import GoogleMapsUtils

class ClusterIconGenerator: GMUDefaultClusterIconGenerator {
    
    override func icon(forSize size: UInt) -> UIImage {
        let image = textToImage(drawText: String(size) as NSString,
                                inImage: UIImage(named: "clusterMarker")!,
                                font: UIFont(name: "Futura-Medium", size: 12.0) ?? UIFont.systemFont(ofSize: 12))
        return image
    }
    
    private func textToImage(drawText text: NSString, inImage image: UIImage, font: UIFont) -> UIImage {
        
        UIGraphicsBeginImageContext(image.size)
        image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
        
        let textStyle = NSMutableParagraphStyle()
        textStyle.alignment = NSTextAlignment.center
        let textColor = UIColor.black
        let attributes=[
            NSAttributedString.Key.font: font,
            NSAttributedString.Key.paragraphStyle: textStyle,
            NSAttributedString.Key.foregroundColor: textColor]
        
        // vertically center (depending on font)
        let textH = font.lineHeight
        let textY = (image.size.height-textH)/2
        let textRect = CGRect(x: 0, y: textY, width: image.size.width, height: textH)
        text.draw(in: textRect.integral, withAttributes: attributes)
        let result = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return result!
    }
}

以上是我到目前为止所做的代码，但不值得请你能找到我的出路如何实现在点击操作时在集群项目标记上呈现图标的解决方案。

标签： iosswiftgoogle-maps

Answer 1

如果您有兴趣使用存储桶索引更改图标，我想您可以使用下面的代码来更改图像。您可以使用 buckets 索引并分别显示集群标记的图标。

let iconGenerator = GMUDefaultClusterIconGenerator(buckets: [5, 10, 15], backgroundImages: [#imageLiteral(resourceName: "clusterSelectedMarker"), #imageLiteral(resourceName: "clusterSelectedMarker"), #imageLiteral(resourceName: "clusterSelectedMarker")])
let algorithm = GMUNonHierarchicalDistanceBasedAlgorithm()
                                                clusterIconGenerator: iconGenerator)
var renderer = CustomClusterRenderer(mapView: propertyMapView, clusterIconGenerator: iconGenerator)
clusterManager = GMUClusterManager(map: propertyMapView, algorithm: algorithm,
                                           renderer: renderer)