Determine the map's load status which can be notLoaded, failedToLoad, loading, or loaded.
Use case
Knowing the map's load state may be required before subsequent actions can be executed.
How to use the sample
Open the sample to load the map. The load status will be displayed on screen.
How it works
Create an AGSMap and add it to the AGSMapView.
Use Key-Value Observing on the AGSMap's loadStatus property to determine when the status has changed.
The value of the loadStatus property is loaded when any of the following criteria are met:
The map has a valid spatial reference.
The map has an an initial viewpoint.
One of the map's predefined layers has been created.
Relevant API
AGSLoadStatus
AGSMap
AGSMapView
Tags
loadable pattern, loadStatus, map
Sample Code
MapLoadedViewController.swift
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// Copyright 2016 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.import UIKit
import ArcGIS
classMapLoadedViewController: UIViewController{
/// The map displayed in the map view.let map =AGSMap(basemapStyle: .arcGISImagery)
@IBOutletvar mapView: AGSMapView!
@IBOutletvar bannerLabel: UILabel!
privatevar mapLoadStatusObservation: NSKeyValueObservation?
overridefuncviewDidLoad() {
super.viewDidLoad()
// setup source code bar button item (navigationItem.rightBarButtonItem as!SourceCodeBarButtonItem).filenames = ["MapLoadedViewController"]
// assign map to map view mapView.map = map
mapLoadStatusObservation = map.observe(\.loadStatus, options: .initial) { [weakself] (_, _) in// update the banner label on main threadDispatchQueue.main.async {
self?.updateLoadStatusLabel()
}
}
}
overridefuncviewWillAppear(_animated: Bool) {
super.viewWillAppear(animated)
updateLoadStatusLabel()
}
privatefuncupdateLoadStatusLabel() {
bannerLabel.text ="Load status: \(map.loadStatus.title)" }
}
privateextensionAGSLoadStatus{
/// The human readable name of the load status.var title: String {
switchself {
case .loaded:
return"Loaded"case .loading:
return"Loading"case .failedToLoad:
return"Failed to Load"case .notLoaded:
return"Not Loaded"case .unknown:
fallthrough@unknowndefault:
return"Unknown" }
}
}