private async void Initialize()
{
try
{
// Show a loading indicator.
View.AddSubview(_progressIndicator);
_progressIndicator.UpdateMessageAndProgress("Loading list of available map areas.", -1);
// Get the offline data folder.
_offlineDataFolder = Path.Combine(GetDataFolder(),
"SampleData", "DownloadPreplannedMapAreas");
// If the temporary data folder doesn't exist, create it.
if (!Directory.Exists(_offlineDataFolder))
{
Directory.CreateDirectory(_offlineDataFolder);
}
// Create a portal that contains the portal item.
ArcGISPortal portal = await ArcGISPortal.CreateAsync();
// Create the webmap based on the id.
PortalItem webmapItem = await PortalItem.CreateAsync(portal, PortalItemId);
// Create the offline map task and load it.
_offlineMapTask = await OfflineMapTask.CreateAsync(webmapItem);
// Query related preplanned areas.
_preplannedMapAreas = await _offlineMapTask.GetPreplannedMapAreasAsync();
// Load each preplanned map area.
foreach (var area in _preplannedMapAreas)
{
await area.LoadAsync();
}
// Show a popup menu of available areas when the download button is clicked.
_downloadButton.TouchUpInside += DownloadButton_Click;
// Remove loading indicators from UI.
_progressIndicator.RemoveFromSuperview();
}
catch (Exception ex)
{
// Something unexpected happened, show the error message.
UIAlertController alertController = UIAlertController.Create("An error occurred.", ex.Message, UIAlertControllerStyle.Alert);
alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alertController, true, null);
}
}
private async void Initialize()
{
try
{
// Show a loading indicator.
View.AddSubview(_progressIndicator);
_progressIndicator.UpdateMessageAndProgress("Loading list of available map areas.", -1);
// Get the offline data folder.
_offlineDataFolder = Path.Combine(GetDataFolder(),
"SampleData", "DownloadPreplannedMapAreas");
// If the temporary data folder doesn't exist, create it.
if (!Directory.Exists(_offlineDataFolder))
{
Directory.CreateDirectory(_offlineDataFolder);
}
// Create a portal that contains the portal item.
ArcGISPortal portal = await ArcGISPortal.CreateAsync();
// Create the webmap based on the id.
PortalItem webmapItem = await PortalItem.CreateAsync(portal, PortalItemId);
// Create the offline map task and load it.
_offlineMapTask = await OfflineMapTask.CreateAsync(webmapItem);
// Query related preplanned areas.
_preplannedMapAreas = await _offlineMapTask.GetPreplannedMapAreasAsync();
// Load each preplanned map area.
foreach (var area in _preplannedMapAreas)
{
await area.LoadAsync();
}
// Show a popup menu of available areas when the download button is clicked.
_downloadButton.TouchUpInside += (s, e) =>
{
// Create the alert controller.
UIAlertController mapAreaSelectionAlertController = UIAlertController.Create("Map Area Selection",
"Select a map area to download and show.", UIAlertControllerStyle.ActionSheet);
// Add one action per map area.
foreach (PreplannedMapArea area in _preplannedMapAreas)
{
mapAreaSelectionAlertController.AddAction(UIAlertAction.Create(area.PortalItem.Title, UIAlertActionStyle.Default,
action =>
{
// Download and show the selected map area.
OnDownloadMapAreaClicked(action.Title);
}));
}
// Needed to prevent a crash on iPad.
UIPopoverPresentationController presentationPopover = mapAreaSelectionAlertController.PopoverPresentationController;
if (presentationPopover != null)
{
presentationPopover.SourceView = View;
presentationPopover.PermittedArrowDirections = UIPopoverArrowDirection.Up;
}
// Display the alert.
PresentViewController(mapAreaSelectionAlertController, true, null);
// Remove the startup prompt if it hasn't been removed already.
if (_initialPrompt != null)
{
_initialPrompt.RemoveFromSuperview();
_initialPrompt = null;
}
};
// Remove loading indicators from UI.
_progressIndicator.RemoveFromSuperview();
}
catch (Exception ex)
{
// Something unexpected happened, show the error message.
UIAlertController alertController = UIAlertController.Create("An error occurred.", ex.Message, UIAlertControllerStyle.Alert);
alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alertController, true, null);
}
}