Question

我一直在尝试使用for循环向谷歌地图添加多个标记，但它不会添加到谷歌地图。添加一个标记有效，或者如果没有for循环为每个标记编写代码。

声明

@IBOutlet weak var googleMapView: GMSMapView! // set in story board
var shopsLatLong = [Double: Double]()  // shops dictionary for lat long

for循环不起作用：

for (key,value) in shopsLatLong{
    //Setting camera
    self.googleMapView.camera = GMSCameraPosition.camera(withLatitude: key, longitude: value, zoom: 6.0)
    let marker = GMSMarker()
    marker.position = CLLocationCoordinate2DMake(key, value)
    marker.title = "Store Name"
    marker.snippet = "Pakistan"
    marker.map = self.googleMapView
    print("Marker is \(marker)")
}

如何让这个工作？请帮助我解决这个问题

Answer 1

不要让class variable作为标记。您必须为local variable创建marker。

如果您创建一个类变量，那么您将只获得一个标记。因为你要覆盖for循环中的值

for (key,value) in shopsLatLong{
     //Get the latitude and longitude of the marker and pass it here.
      let lat = //latitude for marker
      let lon = //longitude for marker
      var marker = GMSMarker()
      marker.position = CLLocationCoordinate2DMake(lat, lon)
      marker.title = "Store Name"
      marker.snippet = "Pakistan"
      marker.map = self.googleMapView
 }

Answer 2

首先创建一个像

这样的数组

func setData(){
        //create dictionary and store in mai array
        var dicMapData : NSMutableDictionary = NSMutableDictionary()
        dicMapData["title"] = "Kalasagar Shopping Hub"
        dicMapData["image"] = "background9"
        dicMapData["subtitle"] = "ShoppingHub"
        dicMapData["latitude"] = 23.0669 // store latitude for specigic location
        dicMapData["longitude"] = 72.5328 // store longitude for specigic location
        arrMultipleAnotation.add(dicMapData)

        dicMapData = NSMutableDictionary()
        dicMapData["title"] = "Satadhar Cross Road"
        dicMapData["image"] = "background8"
        dicMapData["subtitle"] = "Crossroad"
        dicMapData["latitude"] = 23.0629
        dicMapData["longitude"] = 72.5328
        arrMultipleAnotation.add(dicMapData)

        dicMapData = NSMutableDictionary()
        dicMapData["title"] = "Sola Bridge"
        dicMapData["image"] = "menu-icon"
        dicMapData["subtitle"] = "Bridge"
        dicMapData["latitude"] = 23.0695
        dicMapData["longitude"] = 72.5232
        arrMultipleAnotation.add(dicMapData)

        let initialLocation = CLLocation(latitude: 23.0669, longitude: 72.5289)
        centerMapOnLocation(location: initialLocation)

        //For Displayig Multiple Pin in mapview using array and loop
        for locations in arrMultipleAnotation{
            //Setting camera
                self.googleMapView.camera = GMSCameraPosition.camera(withLatitude: dicCurrent["latitude"] as! Double, longitude: dicCurrent["longitude"] as! Double, zoom: 6.0)
                self.marker = GMSMarker()
                self.marker.position = CLLocationCoordinate2D(latitude: dicCurrent["latitude"] as! Double, longitude: dicCurrent["longitude"] as! Double)
                self.marker.title = dicCurrent["title"] as? String
                self.marker.snippet = dicCurrent["subtitle"] as? String
                self.marker.map = self.googleMapView
                print("Marker is \(self.marker)")

        }

我希望它对你有用

Answer 3

更改此代码..

@IBOutlet weak var googleMapView: GMSMapView! // set in story board
var shopsLatLong = [Double: Double]()  // shops dictionary for lat long 


for (key,value) in shopsLatLong{
//Setting camera
      self.googleMapView.camera = GMSCameraPosition.camera(withLatitude: key, longitude: value, zoom: 6.0)
        let marker = GMSMarker()
        marker.position = CLLocationCoordinate2DMake(key, value)
        marker.title = "Store Name"
        marker.icon = image
        marker.snippet = "Pakistan"
        marker.map = self.googleMapView
        print("Marker is \(self.marker)")
}

Answer 4

您应该使用markers属性，这是一个数组，并将您的标记添加到此数组。这样就可以强烈引用所有标记对象，并且可以轻松使用它们。

此外，字典实际上并不是一个很好的数据结构。我会建议一个struct数组，其中struct具有纬度和经度，甚至是(Double,Double)的元组数组

@IBOutlet weak var googleMapView: GMSMapView! // set in story board
var shopsLatLong = [(Double,Double)]()  // shops dictionary for lat long
var markers = [GMSMarker]()


for (position) in shopsLatLong{
//Setting camera
      self.googleMapView.camera = GMSCameraPosition.camera(withLatitude: position.0, longitude: position.1, zoom: 6.0)
        let marker = GMSMarker()
        marker.position = CLLocationCoordinate2DMake(position.0, position.1)
        marker.title = "Store Name"
        marker.snippet = "Pakistan"
        marker.map = self.googleMapView
        self.markers.append(marker)
        print("Marker is \(marker)")
}

Answer 5

我也有类似的问题，我能够弄清楚。实际上我并没有压倒准备segue，按钮也直接链接到故事板，因为我的视图在我获取数据之前首先自我呈现。所以这就是我所做的也许它也适合你。

覆盖准备segue并在那里设置变量

删除直接与按钮链接的segue链接（如果有）

从视图控制器的顶部向新的segue添加新的segue。

构建并运行。

我希望它能为你解决这个问题。

Swift 3：谷歌地图没有在for循环中设置标记

5 个答案: