Question

我在mapView中添加多个标记时遇到了麻烦，但是我总是最后显示一个标记，而最后一个标记是我不知道为什么。这样做的目的是获取包含经度和纬度的数据并添加这些标记，我试图将其静态化，但是我可以显示多个标记

我创建了一个添加新标记的函数，并在viewDidLoad中调用它 `覆盖func viewDidLoad（）{ super.viewDidLoad（）

        AddMarker(title: "pala", snippet: "nanana", latitude: 35.741522, longitude: 9.805937)


        AddMarker(title: "pala", snippet: "nanana", latitude: 36.89939467218524, longitude: 10.187976658321267)



    }
    private func AddMarker(title:String , snippet:String  , latitude:Double , longitude:Double){
        var title = title
        var snippet = snippet
        var latitude = latitude
        var longitude = longitude

        let camera = GMSCameraPosition.camera(withLatitude: latitude, longitude: longitude, zoom: 6.0)
        let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
        view = mapView

        // Creates a marker in the center of the map.
        let marker = GMSMarker()
        marker.position = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
        marker.title = title
        marker.snippet = snippet
        marker.map = mapView
    }

`

Answer 1

在addMarker方法之外，将GMSMapView实例创建为实例属性。然后在addMarker方法中更改它的相机位置并添加标记。

let mapView = GMSMapView()

private func addMarker(title:String, snippet:String , latitude:Double , longitude:Double){
    let camera = GMSCameraPosition.camera(withLatitude: latitude, longitude: longitude, zoom: 6.0)
    self.mapView.animate(to: camera)

    // Creates a marker in the center of the map.
    let marker = GMSMarker()
    marker.position = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
    marker.title = title
    marker.snippet = snippet
    marker.map = mapView
}

一个接一个地添加多个标记时，请勿将相机位置设置为最后一个标记位置的动画。要在地图视图中显示所有标记，您可以使用GMSCoordinateBounds

let mapView = GMSMapView()
var bounds = GMSCoordinateBounds()

override func viewDidLoad() {
    super.viewDidLoad()
    addMarker(title: "pala", snippet: "nanana", latitude: 35.741522, longitude: 9.805937)
    addMarker(title: "pala", snippet: "nanana", latitude: 36.89939467218524, longitude: 10.187976658321267)
}
private func addMarker(title:String, snippet:String , latitude:Double , longitude:Double){
    // Creates a marker in the center of the map.
    let marker = GMSMarker()
    marker.position = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
    marker.title = title
    marker.snippet = snippet
    marker.map = mapView

    bounds = bounds.includingCoordinate(marker.position)
    let update = GMSCameraUpdate.fit(bounds, withPadding: 50)
    mapView.animate(with: update)
}

我在mapView中添加多个标记时遇到麻烦

1 个答案: