Fix Transparent background on iOS

[tranhuongk]

Fix #415

What is the motivation and context behind this change?

set mapView.isOpaque = false

Pull request checklist:

• Add a changelog entry.
• Write tests for all new functionality. If tests were not written, please explain why.
• Add documentation comments for any added or updated public APIs.

[evil159]

Hi @tranhuongk, thank you for your contribution! Could you make this behavior configurable from the dart side, plus this option is also applicable for Android, there opacity can be achieved by using a texture view rendering - MapInitOptions.textureView.

[tranhuongk]

@evil159 with textureView

Flag indicating to use a TextureView as render surface for the MapWidget. Only works for Android

[tranhuongk]

@evil159 @OdNairy Can we get back to this issue?

[tranhuongk]

@evil159

[m4ta1]

Any news on this issue? Thanks a lot for fixing this!

[evil159]

Hi all, sorry for the delayed reply, would it be possible to make this configurable from the outside? Like to have this as init parameter for MapWidget?

[vishnupanchal3909]

Hi Team,

I am unable to access the isOpaque property. Could you confirm if this property allows making the background of MapWidget transparent?

Currently, I am facing an issue where disabling the atmosphere in globe projection results in a black background outside the Earth. I need to make this area transparent or set a custom color.

Please let me know ASAP, as I am unable to resolve this issue.

[m4ta1]

Hi all, sorry for the delayed reply, would it be possible to make this configurable from the outside? Like to have this as init parameter for MapWidget?

@evil159 thanks for getting back to this issue. Having an init parameter like "background-opacity" for MapWidget would be a great solution.
Situation right now: Working on layer level by setStyleLayerProperty('background', 'background-opacity', 0) makes the background successfully transparent for Android, but has no effect on iOS.