MGLShapeSource features(matching: NSPredicate) returns old data

[akovalov]

Steps to reproduce

1. Update existing MGLShapeSource every minute with a new shape like the following

...
var shapeSource: MGLShapeSource?
...
shapeSource?.shape = shapeFromGeoJson
mapView?.style.addSource(shapeSource!)

2. Get feature from the source

let feature = shapeSource?.features(matching: NSPredicate(format: "uuid == %@", uuid))

Expected behavior

feature will contain the latest data from just added source

Actual behavior

feature contains the previously added source data
But if add delay it works correctly

DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
    let feature = self.shapeSource?.features(matching: NSPredicate(format: "uuid == %@", uuid))
}

I assume there is some delay in rendering new shape data on layer (like ~0.5s) and it could differ based on features count and layer drawing complexity.

It would be good to understand what caused this delay and how to deal with it - get a callback/delegate or a property like loaded etc. Please advice.

Configuration

Mapbox SDK versions: Mapbox-iOS-SDK (5.8.0)
iOS/macOS versions: iOS 13.4.1
Device/simulator models: iPad Pro (9.7 inch) Simulator
Xcode version: 11.4.1

[1ec5]

get a callback/delegate or a property like loaded etc.

Yes, a callback on tile load would be awesome (even more awesome if it came with a way to manipulate what has been loaded). mapbox/mapbox-gl-native#2775 tracks the various ways in which MGLMapViewDelegate doesn’t align with MKMapViewDelegate.

Fortunately, you may be able to wait for the map’s next render cycle by implementing either -mapViewDidFinishRenderingFrame: or the undocumented -mapViewDidFinishRenderingMap:fullyRendered:. (The fullyRendered: flag isn’t fully implemented; that’s mapbox/mapbox-gl-native#1804.)

[stale]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.