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iOS

How does the constant inside the loop playlistImageView uploads the images back to the IBOutlet? Isn't that a instance?

Inside the loop we have a "let" playlistImageView that gets his value from the playlistsArray. Then we modify that instance we got to the desire image. How does the value assigned at the 3rd line inside the loop gets back to the actual IBOutlet. We are assigning a value to an instance property? Or to the actual IBOutlet 0,1,2 etc etc. Please help im confused.