Button Properties - How to Change when Tapped

Question

Created Sep ’20

Replies 3

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Hi!

I need a function that changes the background colour of the button that is tapped, on a UI with four different buttons.

Please help! Thanks.

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Answer 1

Claude31 OP

Sep ’20

You can override the isHilited method: https://stackoverflow.com/questions/14523348/how-to-change-the-background-color-of-a-uibutton-while-its-highlighted

You can also define background image (if the button is not rounded) with a plain color and change the background image.

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Answer 2

Qtom10 OP

Sep ’20

for the isHighlighted method, would someone be able to give some example code with everything declared? thanks!

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Answer 3

Claude31 OP

Sep ’20

The SO thread gives a lot of code, isn't it enough ?

For instance, this extension to set a color image.

Code Block extension UIButton {
    private func imageWithColor(color: UIColor) -> UIImage {
        let rect = CGRectMake(0.0, 0.0, 1.0, 1.0)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        CGContextSetFillColorWithColor(context, color.CGColor)
        CGContextFillRect(context, rect)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
    func setBackgroundColor(color: UIColor, forUIControlState state: UIControlState) {
        self.setBackgroundImage(imageWithColor(color), forState: state)
    }
}

For isHilighted, declare a subclass of UIButton

Code Block class MyButton: UIButton {
     override open var isHighlighted: Bool {
         didSet {
             backgroundColor = isHighlighted ? UIColor.blue : UIColor.red
         }
     }
}

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