I just found that the solution is:
diceImageView1?.image = Image Literal
because diceImageView1 is already a UIImageView
This is my first experience with optionals in Swift.
Thank you.
pmdenlinger
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Thank you for your suggestion; I will give it a try.
I am following a course on learning Swift (I'm new to it); and the answer the teacher of the course is here: Xcode view controller - https://gist.github.com/angelabauer/9d94ee98153b84681a63e7744077c9f0
Have there been changes made to Swift and/or Xcode since she posted her solution?