https://developers.google.com/maps/documentation/ios-sdk/utility/marker-clustering
我正在处理地图聚合。在地图聚合中，
请提供需要翻译的具体内容。
private var mapView: GMSMapView!
用于地图视图的是GMSMapView，但在故事版连接中找不到任何GMSMapView！
从故事板中发现：
@IBOutlet var mapView: MKMapView!
这就是问题所在。当我使用谷歌地图的示例时，它会抛出错误。
这个类不符合关键值编码（KVC）规范，无法访问mapView属性。
以下是完整的代码：
import UIKit
import MapKit
import GooglePlaces
import GoogleMaps
// Point of Interest Item which implements the GMUClusterItem protocol.
class POIItem: NSObject, GMUClusterItem {
var position: CLLocationCoordinate2D
var name: String!
init(position: CLLocationCoordinate2D, name: String) {
self.position = position
self.name = name
}
}
let kClusterItemCount = 10000
let kCameraLatitude = -33.8
let kCameraLongitude = 151.2
class FirstViewController: UIViewController , GMUClusterManagerDelegate,
GMSMapViewDelegate {
// @IBOutlet var mapView: MKMapView!
private var mapView: GMSMapView!
private var clusterManager: GMUClusterManager!
override func viewDidLoad() {
super.viewDidLoad()
// Set up the cluster manager with the supplied icon generator and
// renderer.
// Set up the cluster manager with default icon generator and renderer.
let iconGenerator = GMUDefaultClusterIconGenerator()
let algorithm = GMUNonHierarchicalDistanceBasedAlgorithm()
let renderer = GMUDefaultClusterRenderer(mapView: mapView, clusterIconGenerator: iconGenerator)
clusterManager = GMUClusterManager(map: mapView, algorithm: algorithm, renderer: renderer)
// 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()
// Register self to listen to both GMUClusterManagerDelegate and GMSMapViewDelegate events.
clusterManager.setDelegate(self, mapDelegate: self)
}
// override func loadView() {
//
// // Create a GMSCameraPosition that tells the map to display the
// // coordinate -33.86,151.20 at zoom level 6.
// let camera = GMSCameraPosition.camera(withLatitude: -33.86, longitude: 151.20, zoom: 6.0)
// let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
// view = mapView
//
// // Creates a marker in the center of the map.
// let marker = GMSMarker()
// marker.position = CLLocationCoordinate2D(latitude: -33.86, longitude: 151.20)
// marker.title = "Sydney"
// marker.snippet = "Australia"
// marker.map = mapView
//
// }
//
// MARK: - GMUClusterManagerDelegate
func clusterManager(clusterManager: GMUClusterManager, didTapCluster cluster: GMUCluster) {
let newCamera = GMSCameraPosition.camera(withTarget: cluster.position,
zoom: mapView.camera.zoom + 1)
let update = GMSCameraUpdate.setCamera(newCamera)
mapView.moveCamera(update)
}
// MARK: - GMUMapViewDelegate
func mapView(mapView: GMSMapView, didTapMarker marker: GMSMarker) -> Bool {
if let poiItem = marker.userData as? POIItem {
NSLog("Did tap marker for cluster item \(poiItem.name)")
} else {
NSLog("Did tap a normal marker")
}
return false
}
// MARK: - Private
/// Randomly generates cluster items within some extent of the camera and adds them to the
/// cluster manager.
private func generateClusterItems() {
let extent = 0.2
for index in 1...kClusterItemCount {
let lat = kCameraLatitude + extent * randomScale()
let lng = kCameraLongitude + extent * randomScale()
let name = "Item \(index)"
let item = POIItem(position: CLLocationCoordinate2DMake(lat, lng), name: name)
clusterManager.add(item)
}
}
/// Returns a random value between -1.0 and 1.0.
private func randomScale() -> Double {
return Double(arc4random()) / Double(UINT32_MAX) * 2.0 - 1.0
}
}
