在UIButton中实现切换功能

button.setImage(UIImage(named: "image1"), for: .normal)
button.setImage(UIImage(named: "image2"), for: .selected)
button.setTitle("Title1", for: .normal)
button.setTitle("Title2", for: .selected)
button.setTitleColor(.blue, for: .normal)
button.setTitleColor(.red, for: .selected)

button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)

@objc func buttonTapped(sender: UIButton) {
    sender.isSelected = !sender.isSelected
}

button.tag = 0
button.setImage(UIImage(named: "image1"), for: .normal)

button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)

@objc func buttonTapped(sender: UIButton) {
    if sender.tag == 0 {
        sender.setImage(UIImage(named: "image2"), for: .normal)
        sender.tag = 1
    } else {
        sender.setImage(UIImage(named: "image1"), for: .normal)
        sender.tag = 0
    }
}

button.setImage(UIImage(named: "image1"), for: .normal)
button.setTitle("Title1", for: .normal)

button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)

@objc func buttonTapped(sender: UIButton) {
    if sender.imageView?.isHidden == false {
        sender.imageView?.isHidden = true
        sender.titleLabel?.isHidden = false
    } else {
        sender.imageView?.isHidden = false
        sender.titleLabel?.isHidden = true
    }
}