Question

我有一个GMSMapView的视图控制器，并在地图上加载了许多标记。我可以使用mapView.selectedMarker = ...更改选择的标记，但如何更改所选标记的颜色？

Answer 1

您可以使用GMSMarker.markerImage(with: <UIColor?>)重置标记的图标。

文档：Google Maps iOS SDK GMSMarker Class Reference

import GoogleMaps

// view controller
class MapViewController: UIViewController {

    // outlets
    @IBOutlet weak var mapView: GMSMapView!

    // view did load method
    override func viewDidLoad() {
        super.viewDidLoad()

        // set map view delegate
        mapView.delegate = self
    }
}

// extension for GMSMapViewDelegate
extension MapViewController: GMSMapViewDelegate {

    // tap map marker
    func mapView(_ mapView: GMSMapView, didTap marker: GMSMarker) -> Bool {
        print("didTap marker \(marker.title)")

        // remove color from currently selected marker
        if let selectedMarker = mapView.selectedMarker {
            selectedMarker.icon = GMSMarker.markerImage(with: nil)
        }

        // select new marker and make green
        mapView.selectedMarker = marker
        marker.icon = GMSMarker.markerImage(with: UIColor.green)

        // tap event handled by delegate
        return true
    }
}

Answer 2

如果你使用RxSwift，这是一个优雅的RxGoogleMaps

解决方案

Observable.combineLatest(mapView.rx.selectedMarker,
                         mapView.rx.selectedMarker.skip(1))
    .subscribe(onNext: { (old, new) in
        old?.icon = GMSMarker.markerImage(with: nil)
        new?.icon = GMSMarker.markerImage(with: UIColor.red)
    })
    .disposed(by: disposeBag)

Answer 3

Simple Way Swift 4

marker.icon = GMSMarker.markerImage(with: UIColor.green)

Answer 4

接受的答案对我不起作用，因为如果用户在地图上点击了非标记，则selectedMarker将设置为nil。如果用户随后点击另一个标记，从而触发didTap回调，则selectedMarker将为nil，从而保留其选择的状态/颜色。

对我来说，解决方法是从didTap中删除该selectedMarker逻辑，然后将其移至didCloseWindowOf。

代码如下：

func mapView(_ mapView: GMSMapView, didTap marker: GMSMarker) -> Bool {
    marker.icon = UIImage(named: "map_marker_selected")
    return false // return false to display info window
}

func mapView(_ mapView: GMSMapView, didCloseInfoWindowOf marker: GMSMarker) {
    marker.icon = UIImage(named: "map_marker_unselected")
}

之所以起作用，是因为当用户点击非标记时，信息窗口关闭，从而触发didCloseInfoWindowOf。

如何在swift中选择更改谷歌地图标记颜色？

4 个答案: