swift - 无法在 GSMapView xCode Swift 3 中添加多个标记

Question

我正在尝试在我的应用中的 Googlemaps 上添加多个标记。

在 viewDidLoad 下的 View Controller 中，我能够加载 map 和单个标记。

override func viewDidLoad() {
    super.viewDidLoad()
    title = NSLocalizedString("section_map", comment: "test")
    let camera = GMSCameraPosition.camera(withLatitude: 48.7784, longitude:9.18121, zoom: 12)
    let mapView = GMSMapView.map(withFrame: .zero, camera: camera)


    view = mapView
    mapView.settings.myLocationButton = true

    mapView.delegate = self

    let marker = GMSMarker()
    marker.position = CLLocationCoordinate2D(latitude: 48.7784,longitude: 9.18121)
    marker.title = "title"
    marker.snippet = "snipple"
    marker.icon = UIImage(named:"pin_you")
    marker.map = mapView

    mapData()
}

它调用mapData()并从那里生成json文件解析后调用setPin来设置标记

  func setPin(){


    DispatchQueue.main.async {

       for item in self.mapItems {
           print (" \(item.name)  \(item.marker) \(item.latitude) \(item.longitude)")

           let marker = GMSMarker()
           marker.position = CLLocationCoordinate2D(latitude: item.latitude,longitude: item.longitude)
           marker.title = item.name
           marker.snippet = item.fulladdress

           var iconImage: String
           switch (item.marker){
           case 1:
              iconImage = "pin_silver"
           case 2:
              iconImage = "pin_blue"
           case 3:
              iconImage = "pin_gold"
           case 6:
              iconImage = "pin_you"
           default:
              iconImage = "pin_silver"
           }
           marker.icon = UIImage(named:iconImage)
           marker.map = self.mapView


       }

    }
}

未显示引脚。

for item in self.mapItems中的打印显示

Position number A  1 48.76947562 9.15440351
Position number B  1 48.75716485 9.17081058
Position number C  1 48.81191625 9.22752149
Position number D  2 48.81192516 9.22766708

这意味着所有正确的数据都可用。然而， map 是在 viewDidLoad 中制作的一个引脚函数 setPin 中的标记未显示或可能未设置。

有人有想法吗？

Answer 1

我已经解决了这个问题，也更改了 setPin(mapView: GMSMapView!) 的 mapData(mapView: GMSMapView!)

  func setpin(mapView: GMSMapView!){


    DispatchQueue.main.async {

       for item in self.mapItems {
           print (" \(item.name)  \(item.marker) \(item.latitude) \(item.longitude)")

           let marker = GMSMarker()
           marker.position = CLLocationCoordinate2D(latitude: item.latitude,longitude: item.longitude)
           marker.title = item.name
           marker.snippet = item.fulladdress

           var iconImage: String
           switch (item.marker){
           case 1:
              iconImage = "pin_silver"
           case 2:
              iconImage = "pin_blue"
           case 3:
              iconImage = "pin_gold"
           case 6:
              iconImage = "pin_you"
           default:
              iconImage = "pin_silver"
           }
           marker.icon = UIImage(named:iconImage)
           marker.map = mapView


       }

    }
}