Show lane guidance in CarPlay guidance panel

[1ec5]

CarPlayNavigationViewController now snapshots a LanesView for display in the CarPlay guidance panel. The layout needs work: currently all the LaneViews are smooshed up against the upper-left corner of the LanesView, and they’re shown at full scale but cropped.

LanesView is the right size, but the stack view inside it seems to be missing constraints:

Additionally, LaneView will need to be modified to accept alternative dimensions for the arrows.

Fixes #1858.

/cc @JThramer @frederoni

[frederoni]

There was a missing width constraint when the LanesView isn't wrapped in a container view as you assumed.

The lane icons are not rendered pixel perfect, but the constraints seem to be correct now. It's tricky when Xcode’s view hierarchy debugger doesn't work with CarPlay. Not sure if the blurriness comes from the PaintCode assets being incorrectly scaled or .imageRepresentation using the incorrect scale. Also, I think there's a separator view we should hide when the LanesView is being used in CarPlay.

Do you think we need to update the lane view icons? Maneuver icons support both size and scale, but the lane views only support scale:

Actually, lane_slight_right is the only lane asset that support scale.

I can take a look at the PaintCode assets if necessary. Can you merge master into this branch in the meantime?

[1ec5]

Do you think we need to update the lane view icons? Maneuver icons support both size and scale, but the lane views only support scale:

That would be nice; the arrows end up looking pretty anemic at that size.

[1ec5]

Do you think we need to update the lane view icons? Maneuver icons support both size and scale, but the lane views only support scale

Would this be addressed by mapbox/navigation-ui-resources#7?

[frederoni]

Would this be addressed by mapbox/navigation-ui-resources#7?

Good point. Testing these here #1910

[akitchen]

Looks like this has gone stale. Can we revive it? It looks really promising.

[1ec5]

I’m also seeing lanes get dropped in some cases. A route from 39.287527°N, 84.462424°W to 39.290445°N, 84.467252°W traverses this way tagged turn:lanes=left|left|through|through|right|right, which is correctly interpreted by the Directions API, yet I only see four lane icons in the CarPlay UI:

I suspect that’s because we’re constraining the image to fit within the 120×18-point allowable image size. We should check whether that check is as strict for lane icons as it is for shields.

[1ec5]

Closing in favor of #2798.