GMSMarker 信息窗口 - 数据未更新

Question

我想要完成的是每 X 秒刷新一次地图。这样做时，我想更新所选标记的信息窗口的内容。但是，标记数据已更新（尝试使用纬度/经度），但信息窗口数据保持不变。如何更新信息窗口数据，而无需重新创建它？

如果我总是重新创建信息窗口（重新选择标记），信息窗口内容会发生变化，但用户体验很糟糕，因为信息窗口正在闪烁。

更新标记数据的代码

private func updateMarker(index: Int, markerData: MarkerData, select: Bool) {
    markersOnMap[index].title = markerData.time.description
    
    if markersOnMap[index].hasChangedPosition(markerData: markerData) {
        markersOnMap[index].position = markerData.getPosition()
        
        UIImpactFeedbackGenerator(style: .heavy).impactOccurred()
    }
    
    //Info window is recreated, but the UI is awful
    //if select {
        //mapView?.selectedMarker = nil
        //mapView?.selectedMarker = markersOnMap[index]
    //}
}

创建标记并将其添加到地图的代码：

private func addMarker(markerData: MarkerData, select: Bool) {
    let marker = GMSMarker()
    marker.map = mapView
    marker.position = markerData.getPosition()
    marker.userData = markerData.tranId
    marker.title = markerData.time.description
    marker.groundAnchor = CGPoint(x: 0.5, y: 0.5)
    if select == true {
        //Where markerInfoWindow is created
        marker.icon = UIImage(named: MyImages.markerIcon)
        marker.tracksInfoWindowChanges = true
        mapView?.selectedMarker = marker
    } else {
        marker.iconView = getMyIconView(posTime: markerData.time)
    }
    
    markersOnMap.append(marker)
}

信息窗口创建

func mapView(_ mapView: GMSMapView, markerInfoWindow marker: GMSMarker) -> UIView? {
    let posTime = CLong(marker.title ?? "0") ?? 0

    var rect = CGRect(x: 0, y: 0, width: 150, height: 140)
    
    let hostingController = UIHostingController(rootView: MyInfoView(device: device, posTime: posTime))
    
    hostingController.view.frame = rect
    hostingController.view.backgroundColor = .clear
    return hostingController.view
}

Answer 1

由于无法通过标记更新来实现所需的行为，因此我妥协于 hostingController。我将其转换为局部变量，该变量在创建标记信息窗口后进行初始化。 每次我想要更新信息窗口数据时，我都会使用托管控制器的实例来执行此操作。

初始化托管控制器

func mapView(_ mapView: GMSMapView, markerInfoWindow marker: GMSMarker) -> UIView? {
    let posTime = CLong(marker.title ?? "0") ?? 0
    
    hostingController = UIHostingController(rootView: MyInfoView(device: device, posTime: posTime))
    
    hostingController?.view.frame = CGRect(x: 0, y: 0, width: 150, height: 140)
    hostingController?.view.backgroundColor = .clear
    return hostingController?.view
}

更新信息窗口数据（本例中为 posTime）

private func updateMarker(index: Int, markerData: MarkerData, select: Bool) {
    markersOnMap[index].title = markerData.time.description
    
    if markersOnMap[index].hasChangedPosition(markerData: markerData) {
        markersOnMap[index].position = markerData.getPosition()
        
        UIImpactFeedbackGenerator(style: .heavy).impactOccurred()
    }
    
    if select {
        hostingController?.rootView.posTime = markerData.time
    }
}