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이루어지다

class ExpandButton: UIButton {

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.commonInit()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.commonInit()
    }

    func commonInit() {
        self.addTarget(self, action: #selector(self.touchDownAnimation), for: .touchDown)
        self.addTarget(self, action: #selector(self.touchUpAnimation), for: .touchUpInside)
        self.addTarget(self, action: #selector(self.touchUpAnimation), for: .touchUpOutside)
        self.addTarget(self, action: #selector(self.touchUpAnimation), for: .touchCancel)
    }

    @objc
    func touchDownAnimation() {
        let scale: CGFloat = (round(UIScreen.main.bounds.width / self.bounds.width / 2) / 10) + 1
        UIView.animate(
            withDuration: 0.1,
            delay: 0,
            options: .curveLinear,
            animations: {
                self.transform = self.transform.scaledBy(x: scale, y: scale)
        },  completion: nil)
    }

    @objc
    func touchUpAnimation() {
        UIView.animate(
            withDuration: 0.5,
            delay: 0,
            usingSpringWithDamping: 0.2,
            initialSpringVelocity: 10,
            options: .curveEaseOut,
            animations: {
                self.transform = .identity
        }, completion: nil)
    }
}

설명 같은 거.