localreasoning-3.swift

class MyButton: UIButton {
    
    var action: (() -> ())?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        sharedInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        sharedInit()
    }
    
    private func sharedInit() {
        addTarget(self, action: #selector(touchUpInside), for: .touchUpInside)
    }
    
    @objc private func touchUpInside() {
        action?()
    }
    
}