onStyleLoadedCallback not called on iOS

[woelmer]

Flutter (Channel stable, v1.17.5, on Mac OS X 10.15.5 19F101, locale en-US)
On Master branch of plugin.

The onStyleLoadedCallback is not called in the example app. Notice if you go to 'Place Symbol' and click on add (asset image) or add (network image) it does not work. That is because these images are setup in the onStyleLoadedCallback which is not called on iOS. This works fine on Android.

[TimothySealy]

Hi @woelmer,

I'm trying to reproduce this error but everything seems to work on my device. If I click on add(asset image) or add(network image) the symbols are shown with a mapbox icon or placholder image respectively. Looking at the code the onStyleLoadedCallback should be trigger:
https://github.com/tobrun/flutter-mapbox-gl/blob/4ce26231f3250b598060063d1b8b65950694754e/ios/Classes/MapboxMapController.swift#L525-L527

Can you verify that the onStyleLoadedCallback is not triggered by adding a breakpoint of print statement in this method:
https://github.com/tobrun/flutter-mapbox-gl/blob/4ce26231f3250b598060063d1b8b65950694754e/example/lib/place_symbol.dart#L48-L51

[lj64]

I experienced the same issue just yesterday in my project on ios.

onStyleLoadedCallback fired on first entry into the page containing map.
When I closed it and opened again, it did not fire, even though map tiles were displayed.

On Android everything was fine.

[TimothySealy]

Just tested it a couple of times and it seems that the onStyleLoadedCallback is not always fired. On my device in most cases the style is loaded properly but some times it is not and then the icon images are not loaded. Will have to look deeper into this issue.

[woelmer]

@TimothySealy The new recommendation is to add symbols in the onStyleLoadedCallback which is why I noticed it in my own project. I thought I would try out the example and noticed the same thing. I had breakpoints there that were not getting hit. I did have it successfully call the callback once if I recall, so I guess it is intermittent like you noticed.

[philiplindberg]

Seeing the exact same thing as @woelmer - tapping on add (asset image) or add (network image) in the example app does nothing on ios because onStyleLoadedCallback is never called.

The only time I can get onStyleLoadedCallback to be called on ios is after reinstalling the app. When the map is generated for the very first time, onStyleLoadedCallback does get called on both ios and android, but every time after that, onStyleLoadedCallback is only called on android.

[m0nac0]

@woelmer @philiplindberg If you previously added your annotations before onStyleLoadedCallback was fired and that worked for you, you can continue to do this as a workaround. The new documentation wasn't added because we changed any behavior. Adding annotations in onStyleLoadedCallback was always recommended (just less visibly).

[tonnyavery]

I can confirm the issue. Have not been testing on iOS for some time, so not sure when it started happening exactly.
I have updated to 0.8.0 release and also upgraded Flutter to latest available.
Android seems to work fine, on iOS onStyleLoaded is not invoked when map shows.
If I manually (via setState) change map style, callback is invoked, but I do get a crash almost instantly after that. Not sure it's related.

[edufpin]

Happening with me too, my workaround is check OS and if iOS do it manually after onMapCreated.

[tonnyavery]

Issue is still present on latest master, after the supposed fix was merged. @andrea689 Was the issue fixed in your tests?

[tonnyavery]

Ok, this was an issue on my side, didn't update properly. Seems to be more stable now, I'll keep testing

[tonnyavery]

This is still completely unstable for me.
Sometimes callback is called, but most of the times it isn't