Shields missing in CarPlay simulator

[1ec5]

Route shields and exit numbers don’t appear in turn-by-turn mode in the CarPlay simulator, even though they show up in CarPlay devices.

/ref #1652 (comment)
/cc @JThramer

[1ec5]

Hard-coding an image size of 16×16 points in UIView.imageRepresentation makes the image show up in the CarPlay simulator, which strongly suggests to me that this issue and #1866 are both caused by images exceeding an undocumented maximum image size in text attachments in attributed instruction strings in CarPlay.

mapbox-navigation-ios/MapboxNavigation/UIView.swift

Line 141 in 84ffc89

let size = CGSize(width: frame.size.width, height: frame.size.height)

[akitchen]

huh... 🤔 I wonder if it's related to the line height of the font being used, etc. I recommend enabling the extended carplay simulator options and trying different form factors & pixel depths

nice catch!

[1ec5]

CarPlay ignores font and paragraph attributes in attributedInstructionVariants. NSAttributedString is only used for embedding text attachments in the instruction. Given that there are size limits to all the other image assets that go over the (presumably XPC-like) communication protocol, it doesn’t surprise me that text attachments also have a height limit of 16 points.