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);
            }
        }
コード例 #2
0
        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);
            }
        }