MapMarkers Not appearing in iOS

[Andrew]

I am currently working on a cross platform (iOS and Android) project that uses the map control. Adding map markers results in either crashing the app or not displaying markers in iOS depending on the how I am adding the markers. Note: both methods work as expected on Android.

1. The first method is adding them through the .xaml file. This results in the app crashing when navigating to the map page with the following exception:

{System.NullReferenceException: Object reference not set to an instance of an object

  at Syncfusion.SfMaps.XForms.iOS.SfMapsRenderer.ConvertFormsToNative (Xamarin.Forms.DataTemplate view, CoreGraphics.CGRect size, Syncfusion.SfMaps.XForms.MapMarker marker) [0x00000] in <9459282c908f43efb3825079168468e4>:0 

  at Syncfusion.SfMaps.XForms.iOS.DelegateMapping.DrawMarker (Syncfusion.SfMaps.iOS.SFMap map, Syncfusion.SfMaps.iOS.SFMapMarker marker, CoreGraphics.CGPoint point) [0x00032] in <9459282c908f43efb3825079168468e4>:0 

  at Syncfusion.SfMaps.iOS.SFMapLayer.RefreshMarkers () [0x00053] in <67887b5007aa41efb7e1a8781f476ce5>:0 

  at Syncfusion.SfMaps.iOS.SFMapLayer.LayoutSubviews () [0x00730] in <67887b5007aa41efb7e1a8781f476ce5>:0 

  at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)

  at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/5665/db807ec9/source/xamarin-macios/src/UIKit/UIApplication.cs:79 

  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/5665/db807ec9/source/xamarin-macios/src/UIKit/UIApplication.cs:63 

  at CTG.iOS.Application.Main (System.String[] args) [0x00002] in C:\Users\...\iOS\Main.cs:19 }

The .xaml looked like:

maps:SfMaps Grid.Row="2" IsVisible="false" x:Name="Map">                     

        <maps:SfMaps.Layers>                

            <maps:ShapeFileLayer ShapeSelected="Handle_ShapeSelected"

                    EnableSelection="true" 

                         ShowMapItems="true"

            ShapeIDPath="StateName" ShapeIDTableField="STATE_NAME" x:Name="MapLayer">

                        <maps:ShapeFileLayer.Uri>

                            <OnPlatform x:TypeArguments="x:String">

                                <OnPlatform.Platforms>

                                    <On Platform="iOS" Value="states.shp" />

                                    <On Platform="Android" Value="usa_state.shp" />

                                </OnPlatform.Platforms>

                                </OnPlatform>

                        </maps:ShapeFileLayer.Uri>

                        <maps:ShapeFileLayer.MarkerSettings>

                            <maps:MapMarkerSetting IconColor="{StaticResource Exception}" MarkerIcon="Diamond"/>

                        </maps:ShapeFileLayer.MarkerSettings><maps:ShapeFileLayer.MarkerSettings>

                        <maps:MapMarkerSetting IconColor="{StaticResource Exception}" MarkerIcon="Diamond"/>

                    </maps:ShapeFileLayer.MarkerSettings>

                    <maps:ShapeFileLayer.Markers>

                        <!-- California -->

                        <maps:MapMarker Latitude = "37" Longitude = "-120"/>

                        <!-- Washington -->

                        <maps:MapMarker Latitude = "47.680415" Longitude = "-120.050996"/>

                        <!-- Illinois -->

                        <maps:MapMarker Latitude = "40.270476" Longitude = "-89.157629"/>

                        <!-- Virginia -->

                        <maps:MapMarker Latitude = "37.909806" Longitude = "-78.303137"/>

                    </maps:ShapeFileLayer.Markers>

                        <maps:ShapeFileLayer.ShapeSettings>

                        <maps:ShapeSetting ShapeFill="#CFD7E4" ShapeStroke="#FFFFFF" ShapeColorValuePath="Status">

                            <maps:ShapeSetting.ColorMappings>

                                    <maps:EqualColorMapping  Value="0" LegendLabel="Not Available"  Color="{StaticResource NotAvailable}"/>

                                    <maps:EqualColorMapping  Value="1" LegendLabel="Available"  Color="{StaticResource Available}"/>

                                    <maps:EqualColorMapping  Value="1" LegendLabel="Exception"  Color="{StaticResource Exception}"/>

                                </maps:ShapeSetting.ColorMappings>

                        </maps:ShapeSetting>

                    </maps:ShapeFileLayer.ShapeSettings>

            </maps:ShapeFileLayer>           

        </maps:SfMaps.Layers>        

    </maps:SfMaps>

2. The second method was adding the marker during "OnAppearing()" and resulted in the map appearing without markers.

public void SetMarkers()

        {

            MapMarker usa = new MapMarker();

            usa.Latitude = "37";

            usa.Longitude = "-120";

            usa.Label = "United States";

            MapLayer.Markers.Add(usa);

        }

[Sri Gayathri Gopalakrishnan]

Hi Andrew,

Query: MapMarkers Not appearing in iOS

We have analyzed your query and we can able to reproduce the reported issue at our end. We have fixed the reported issue and the fix for the above issue will include in our refresh build which is expected to be rolled out by the end of this week.

We appreciate your patience until then.

Regards,
Sri Gayathri. G

[Sri Gayathri Gopalakrishnan]

Hi Andrew, 

 

We are glad to announce that our Essential Studio Volume 1, SP 1 2018 (v16.1.0.32) is rolled out and is available for download under the following link. 

 

https://www.syncfusion.com/forums/136746/essential-studio-2018-volume-1-service-pack-release-v16-1-0-32-available-for-download 

 

We thank you for your support and appreciate your patience in waiting for this release. Please get in touch with us if you would require any further assistance. 

 

Regards, 

Sri Gayathri. G