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// Copyright 2017 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.
using System;
using Esri.ArcGISRuntime;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;
namespace ArcGISRuntime.Samples.TimeBasedQuery
{
[Register("TimeBasedQuery")]
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
name: "Time-based query",
category: "Layers",
description: "Query data using a time extent. ",
instructions: "Run the sample, and a subset of records will be displayed on the map.",
tags: new[] { "query", "time", "time extent" })]
public class TimeBasedQuery : UIViewController
{
// Hold references to UI controls.
private MapView _myMapView;
// Hold a URI pointing to the feature service.
private readonly Uri _serviceUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Hurricanes/MapServer/0");
// Hold a reference to the feature table used by the sample.
private ServiceFeatureTable _myFeatureTable;
public TimeBasedQuery()
{
Title = "Time-based query";
}
private void Initialize()
{
// Create a new map with oceans basemap.
Map myMap = new Map(BasemapStyle.ArcGISOceans);
// Create feature table for the hurricane feature service.
_myFeatureTable = new ServiceFeatureTable(_serviceUri)
{
// Define the request mode.
FeatureRequestMode = FeatureRequestMode.ManualCache
};
// When feature table is loaded, populate data.
_myFeatureTable.Loaded += OnLoadedPopulateData;
// Create FeatureLayer that uses the created table.
FeatureLayer myFeatureLayer = new FeatureLayer(_myFeatureTable);
// Add created layer to the map.
myMap.OperationalLayers.Add(myFeatureLayer);
// Assign the Map to the MapView.
_myMapView.Map = myMap;
}
private async void OnLoadedPopulateData(object sender, EventArgs e)
{
// Unsubscribe from events.
_myFeatureTable.Loaded -= OnLoadedPopulateData;
// Create new query object that contains a basic 'include everything' clause.
QueryParameters queryParameters = new QueryParameters
{
WhereClause = "1=1",
// Restrict query with a time extent that covers the desired interval (beginning of time to September 16th, 2000).
TimeExtent = new TimeExtent(new DateTime(1, 1, 1), new DateTime(2000, 9, 16))
};
// Create list of the fields that are returned from the service.
string[] outputFields = {"*"};
try
{
// Populate feature table with the data based on query.
await _myFeatureTable.PopulateFromServiceAsync(queryParameters, true, outputFields);
}
catch (Exception ex)
{
new UIAlertView("Error", ex.ToString(), (IUIAlertViewDelegate) null, "OK", null).Show();
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
Initialize();
}
public override void LoadView()
{
// Create the views.
View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };
_myMapView = new MapView();
_myMapView.TranslatesAutoresizingMaskIntoConstraints = false;
// Add the views.
View.AddSubviews(_myMapView);
// Lay out the views.
NSLayoutConstraint.ActivateConstraints(new[]
{
_myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
_myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
_myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
_myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
});
}
}
}