UISearch example for Mapbox Layers & Objects

[troutinsights]

I think an example of implementing UISearch on an added layer's objects would be really useful, unless this is obvious and I'm missing it. A common use case that I've been working towards that I would guess is pretty common is an added MGLLineStyleLayer where the end user may want to search for objects within that layer and jump to the result after hitting the result in the results tableView. Specifically the task of converting the MGLLineStyleLayer data into a usable search query would be useful.

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