ios - 选择一个按钮后，如何取消选择阵列中的所有其他按钮？

Question

目前，当我在我的阵列中选择一个按钮时，它会从灰色变为黑色，如果再次选择，它会变回灰色，这是我想要的。问题是当我选择一个按钮并选择另一个按钮时，它们都将是黑色的。我怎样才能做到当我选择一个按钮，然后选择另一个按钮时，前一个按钮会变回灰色？

let subjectArray = ["Button1", "Button2", "Button3", "Button4"]   
for title in subjectArrary {
                let button = UIButton()
                button.backgroundColor = UIColor.white
                button.setTitle("\(title)", for: .normal)
                button.setTitleColor(UIColor.gray, for: .normal)
                button.heightAnchor.constraint(equalToConstant: 60).isActive = true
                button.widthAnchor.constraint(equalToConstant: 140).isActive = true
                button.addTarget(self, action: #selector(buttonPressed), for: .touchUpInside)

                stack.addArrangedSubview(button)
            }



    func buttonPressed(sender:AnyObject) {

            guard let button = sender as? UIButton else { return }

            if !button.isSelected {
                button.isSelected = true
                button.setTitleColor(UIColor.black, for: .normal)
            } else {
                button.isSelected = false
                button.setTitleColor(UIColor.gray, for: .normal)
            }
        }

Answer 1

// Create an array of buttons which will hold all of your buttons
// This is a class property, we can already initialise this with empty array so we don't need to set it during class init()
let buttons: [UIButton] = [] 

func createButton(withTitle title: String) -> UIButton {
    let button = UIButton()
    button.setTitle(title, for: .normal)
    button.setTitleColor(.gray, for: .normal)
    button.setTitleColor(.black, for: .selected) // Please take note I've added this line
    button.backgroundColor = .white
    button.widthAnchor.constraint(equalToConstant: 140).isActive = true
    button.heightAnchor.constraint(equalToConstant: 60).isActive = true
    button.addTarget(self, action: #selector(didTapButton(_:)), for: .touchUpInside)
    return button
}

func setupButtons() {
    let subjectArray = ["Button1", "Button2", "Button3", "Button4"]   

    for title in subjectArrary {
        let button = createButton(withTitle: title)
        buttons.append(button) // Append all your buttons
        stack.addArrangedSubview(button)
    }
}

func didTapButton(_ button: UIButton) {
    deselectAllButtons()
    button.isSelected = !button.isSelected // set/unset of button state happens here
}

func deselectAllButtons() {
    buttons.forEach { $0.isSelected = false }
}

此行将在您的按钮被选中时为您的按钮设置黑色标题颜色..

button.setTitleColor(.black, for: .selected)

为了获得更清晰的代码，我提取了您的 for 循环中的代码，制作了一小块方法……此外，无需将我的代码注释添加到您的实际代码中；)