This link points to a page that doesn't show the point layer on IOS... arcg.is/jqbOa
Did you create the layer by 'Add Layer from File' in the Web Map? If so, that won't render in the iOS clients as its not calling a service, but the actual raw JSON ( http://www.arcgis.com/sharing/rest/content/items/2018d9563c2b42f2823114c19506ca1a/data ) which is likely a security vulnerability to read raw JSON.
How did you add your data to your Web Map? I might be able to help get around this if you'd like some assistance. Feel free to email me (Andrew.Valenski@charlottenc.gov) for some more granular assistance
Retrieving data ...