How do you change UIButton image alpha on disabled state?

Question

I have a UIButton with an image and on its disabled state, this image should have .3 alpha.

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
UIIm         


        

Answer 1

In case anyone needs it, here's an answer in Swift:

Subclass UIButton and override enabled

class MyCustomButton: UIButton {

override var enabled: Bool {
    didSet{
        alpha = enabled ? 1.0 : 0.3
    }
}

Set the class of any button you want to have this property to "MyCustomButton" (or whatever you choose to name it)

 @IBOutlet weak var nextButton: MyCustomButton!