swift - 如何判断UIButton类的选择状态？

Question

我创建了一个 UIButton 子类，单击后图像之间会发生变化。我如何确定此选择的状态，以用作定义此类的单独 View Controller 中其他位置的引用？

class ClickingCheckbox: UIButton {

    convenience init() {
        self.init(frame: .zero)
        self.setImage(UIImage(named: "yes"), for: .normal)
        self.setImage(UIImage(named: "no"), for: .selected)
        self.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
    }

    @objc private func buttonTapped() {
        UIView.animate(withDuration: 0.1, delay: 0.1, options: .curveLinear, animations: {
            self.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
        }) { (success) in
            self.isSelected = !self.isSelected
            UIView.animate(withDuration: 0.1, delay: 0.1, options: .curveLinear, animations: {
                self.transform = .identity
            }, completion: nil)
        //self.isSelected = !self.isSelected
        }
    }
}

非常感谢!

Answer 1

我认为下面的代码会对您有所帮助。

import UIKit

class ViewController: UIViewController {

let button = ClickingCheckbox()
override func viewDidLoad() {
    super.viewDidLoad()
    button.frame = CGRect(x: self.view.frame.width/2 -  button.frame.width/2  , y: self.view.frame.height/2 -  button.frame.height/2 , width: 100, height: 30)
    button.backgroundColor = UIColor.red
    self.view.addSubview(button)
}

@IBAction func onClicksButton(_ sender: Any) {
    if   self.button.isSelected {
        print("yes selcted ")
    }
    else{
        print("no selcted")
    }
}

}