When using PKDrawing
in dark mode the image generated by imageFromRect:scale: returns pen drawings in white color. In light mode it uses black color. The background is usually transparent.
Question: How can PKDrawing be forced to always behave like in light mode?
You can do it like this, by using traitCollection.performAsCurrent:
let darkImage = thumbnail(drawing: drawing, thumbnailRect: frameForImage, traitCollection: UITraitCollection(userInterfaceStyle: .dark))
func thumbnail(drawing: PKDrawing, thumbnailRect: CGRect, traitCollection: UITraitCollection) -> UIImage {
var image = UIImage()
traitCollection.performAsCurrent {
image = drawing.image(from: thumbnailRect, scale: 2.0)
}
return image
}