Change background image of button when button is clicked in swift 4.0 | swift tutorials

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[oliverfong]

I miss this old school youtube tutorial, talk with a note pad <3 the old time's vibe is strong

[ARecklessNinja]

Inside of the if statement, what do I put where you have the X image? My image's name is sadButton so what do I put for .setBackgroundImage(image: UIImage?, for: .normal) ?

[sunlion]

This dont work bra. VC does not recognize the images.