swift - 如何在 swift4 中显示 GMSPolygon 的标题

Question

这是我的代码，它显示多边形但标题没有显示在任何地方。

       func showGeofense(zoomeffectTo:Int)  {
            for item in self.Geofenses
            {
                let polygon = GMSPolygon()
                let path = GMSMutablePath()
                var cord = CLLocationCoordinate2D(latitude: item.coordinatesArray[0].lat, longitude: item.coordinatesArray[0].lng)
                for o in item.coordinatesArray
                {
                    path.add(CLLocationCoordinate2D(latitude: o.lat, longitude: o.lng))
                }

                polygon.path = path
                //            polygon.fillColor = #colorLiteral(red: 0.9474907517, green: 0.2350950539, blue: 0.1785519123, alpha: 0.24)
                var color  = item.polygonColor
                color.remove(at: color.startIndex)
                print(color)
                var col:Int = Int(color) ?? 0xFFFFFF
                polygon.isTappable = true
                polygon.strokeColor = UIColor(hex: col).withAlphaComponent(0.3)
                polygon.strokeWidth = 5
                polygon.title = item.name
                polygon.map = googlemapView

                if zoomeffectTo == 3
                {
                    self.moveCameraTo(pos: cord)
                }
            }
        }
                // this is printing the title when i click on ploygon
                     func mapView(_ mapView: GMSMapView, didTap overlay: GMSOverlay) {
                            print(overlay.title)

                        }              

上面的函数 didtap overlay 正在触发并打印标题，但我找不到任何方法来显示地理围栏的标题或描述。

Answer 1

检查 GoogleMaps.framework -> GMSPolygon 我发现它的父对象是 GMSOverlay。

在title的描述上我可以看到:

/**
 * Title, a short description of the overlay. Some overlays, such as markers, will display the title
 * on the map. The title is also the default accessibility text.
 */
@property(nonatomic, copy, nullable) NSString *title;

好像只有标记会显示标题...