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By default, we get the opacity of UIButton set to NO. Can we set it to YES?
734
@IBAction func KeyDownPressed(_ sender: UIButton) { sender. alpha = 0.5 } @IBAction func keyPressed(_ sender: UIButton) { sender. alpha = 1 playSound(col : sender. currentTitle!) }
A control that executes your custom code in response to user interactions.
Um... opacity is not a boolean value. It is a float in the range from 0.0 (fully transparent) to 1.0 (fully opaque). The property is actually called the alpha, so you'd do:
[myButton setAlpha:0.42];
setAlpha doesn't work in In swift:
photoButton.alpha = 0.3
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