What are gray constraints in Xcode view hierarchy debug view?

Question

I know what the solid ones are: I created them myself. What about the gray ones? Implicit, maybe via size-to-fit? The gray height conflicts with the solid height. Where do the g

Answer 1

For me the gray constraints appeared because I was modifying the UIView's size outside the main thread.

Make sure you don't make the same mistake:

DispatchQueue.main.async {
   //modify your view here
}