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Colouring UIButton's image

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@KindofNihilist  

I'm adding to my proejct a "guess the country" type of game and I have three buttons with flags in them. I need to apply slight green/red tint to the button when user makes right or wrong choice and I wonder what is the right aproach for that. Initially i thought that button.tintColor = UIColor.green would do the trick but its not the case. I also tried button.imageView?.tintColor = UIColor.green and it doesnt work too. I don't know how to do it right without using CoreImage filters.

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