topic Re: Identify AGSGraphicsOverlay in ArcGIS Runtime SDK for iOS Questions

Identify AGSGraphicsOverlay

Armandvan_der_Zwan — Fri, 05 May 2017 13:19:01 GMT

How can I identify an AGSGraphicsOverlay?

There are no properties to do so, like attributes.

For instance, I want to disable or remove it. Do I need to keep a reference to it?

Armand.

Re: Identify AGSGraphicsOverlay

RyanOlson1 — Fri, 05 May 2017 15:48:23 GMT

Just keep a reference to the overlay you are interested in.

Re: Identify AGSGraphicsOverlay

Nicholas-Furness — Fri, 10 Dec 2021 23:11:21 GMT

Yep. I agree. Keeping a reference is usually the right approach.

In very rare cases I've found the need to pass AGSGraphicsOverlay objects around and not necessarily know where they came from or who they belonged to but still know a little about them. In that case you could extend the AGSGraphicsOverlay class something like this:

extension AGSGraphicsOverlay {
    fileprivate struct AssociatedKeys {
        static var referenceNameKey = "geodev_referenceName"
    }
    
    var referenceName:String? {
        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.referenceNameKey) as? String
        }
        set {
            objc_setAssociatedObject(self, &AssociatedKeys.referenceNameKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
}
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For more info on associated objects and Swift, see here.

Re: Identify AGSGraphicsOverlay

Armandvan_der_Zwan — Tue, 09 May 2017 08:38:54 GMT

Thanks.

I'm keeping a reference to them now, so I can delete them later.