its possible to create multiple constraints for the same object, then change the priority

MultipleOfSameConstraints.swift

// instead of creating and destroying constraints all the time we can just
// add multiple constraints on the same object and then change the priority
// and indicate which one is active
if feedItem!.prototypeUpdate?.media.count <= 1 {
  mediaViewWidthConstraintLarge.priority = 995
  mediaViewWidthContraint.priority = 999
  mediaViewWidthConstraintLarge.isActive = true
  mediaViewWidthContraint.isActive = false
} else {
  mediaViewWidthConstraintLarge.priority = 999
  mediaViewWidthContraint.priority = 995
  mediaViewWidthConstraintLarge.isActive = false
  mediaViewWidthContraint.isActive = true
}