topic Re: Using AGSWebTiledLayer to show custom tiles in ArcGIS Runtime SDK for iOS Questions

Using AGSWebTiledLayer to show custom tiles

RobertKoch1 — Wed, 20 Nov 2019 18:52:43 GMT

I'm currently working on creating and adding `AGSWebTiledLayer` tiles to my map. I have a service that returns valid tiles using the following format as described in the documentation:

http://{subDomain}.host.com/{level}/{col}/{row}.png

The problem that I'm coming across is when I add the `AGSWebTiledLayer` to the `operationLayers` of the map, nothing happens.

I also implemented the `urlForTileKeyHandler` handler and returned the url following the format above, but when debugging, that handler is never called.

Is there something else that needs to happen to get the tiles to display? From what I can tell, the layer is being added to the map, but it's never actually fetching the data.

Thanks.

Re: Using AGSWebTiledLayer to show custom tiles

RobertKoch1 — Wed, 20 Nov 2019 21:06:25 GMT

I figured it out. It seems that web tile layers need to be explicitly told to load, a step which I was neglecting to do.

Re: Using AGSWebTiledLayer to show custom tiles

Nicholas-Furness — Sat, 11 Dec 2021 22:53:20 GMT

Hmm. This is odd. I am unable to reproduce this in my testing using openweatherdata.org tiles…

Which version of Runtime are you using?

In case anyone's interested, here's the code I used to try to test:

import UIKit
import ArcGIS

let apiKey = "GET ONE FROM OPENWEATHERDATA.ORG - FREE ACCOUNT REQUIRED"
let layerNames = ["clouds_new", "temp_new", "precipitation_new"]

class ViewController: UIViewController {

    @IBOutlet weak var mapView: AGSMapView!
    
    var tiledLayers: [AGSWebTiledLayer]? = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let map = AGSMap(basemap: AGSBasemap.streetsVector())
        mapView.map = map

        let layers = layerNames.map({ layerName -> AGSWebTiledLayer in
            let urlTemplate = "https://tile.openweathermap.org/map/\(layerName)/{level}/{col}/{row}.png?appid=\(apiKey)"
            let layer = AGSWebTiledLayer(urlTemplate: urlTemplate)
            layer.opacity = 1.0
            layer.isVisible = false

//            if let rc = AGSRequestConfiguration.global().copy() as? AGSRequestConfiguration {
//                rc.debugLogResponses = true
//                layer.requestConfiguration = rc
//            }

            return layer
        })

        map.operationalLayers.addObjects(from: layers)

        tiledLayers = layers
        tiledLayers?.first?.isVisible = true
        
        mapView.touchDelegate = self
    }
}

extension ViewController: AGSGeoViewTouchDelegate {
    func geoView(_ geoView: AGSGeoView, didTapAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
        guard let layers = mapView.map?.operationalLayers as? [AGSLayer] else { fatalError("Layers are not layers!") }
        
        guard let firstLayer = layers.first else { return }
        
        let newVisible = !firstLayer.isVisible
        
        layers.forEach {
            $0.isVisible = newVisible
        }
    }
}
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Re: Using AGSWebTiledLayer to show custom tiles

Nicholas-Furness — Thu, 02 Jan 2020 15:07:44 GMT

Hi Robert Koch, do you still need to load your layer before it'll work? I wasn't able to reproduce this behavior but am keen to understand if there's some case that triggers it which we haven't considered and need to fix.

Re: Using AGSWebTiledLayer to show custom tiles

RobertKoch1 — Thu, 02 Jan 2020 15:17:49 GMT

Hey Nicholas Furness, I haven't had a chance to look through this with the holidays and all. I actually haven't revisited it since loading the layers is working. If I get time to go back and revisit it, I'll check out your code above and let you know.