关于在 Swift 中一个按钮处于活动状态时禁用一个按钮的问题

Question

上图有两个按钮。 按下左键后，背景被填充为红色。

如果我在这里按右键 我希望右键的背景填充为红色，左键为白色作为右键，并且按钮被停用。

override func viewDidLoad() {
        super.viewDidLoad()

        bookTitleFilterBtn.addTarget(self, action: #selector(bookTitleFilterBtnClicked(_:)), for: .touchUpInside)
        authorNameFilterBtn.addTarget(self, action: #selector(authorNameFilterBtnClicked(_:)), for: .touchUpInside)
    }

//left button
@objc func bookTitleFilterBtnClicked(_ sender: UIButton) {
        DispatchQueue.main.async {
            if self.isHighlighted == false {
                sender.backgroundColor = .red
                let title = NSAttributedString(string: "제목", attributes: [NSAttributedString.Key.foregroundColor: UIColor.white])
                sender.setAttributedTitle(title, for: .normal)
                sender.isHighlighted = true
                self.isHighlighted = true
            } else {
                sender.backgroundColor = .white
                let title = NSAttributedString(string: "제목", attributes: [NSAttributedString.Key.foregroundColor: UIColor.black])
                sender.setAttributedTitle(title, for: .normal)
                sender.isHighlighted = false
                self.isHighlighted = false
            }
        }
    }

//right button
    @objc func authorNameFilterBtnClicked(_ sender: UIButton) {
        DispatchQueue.main.async {

            if self.isHighlighted == false {
                sender.isHighlighted = true
                let title = NSAttributedString(string: "작가", attributes: [NSAttributedString.Key.foregroundColor: UIColor.white])
                sender.setAttributedTitle(title, for: .normal)
                sender.backgroundColor = .red
                self.isHighlighted = true
            } else {
                sender.isHighlighted = false
                self.isHighlighted = false
                let title = NSAttributedString(string: "작가", attributes: [NSAttributedString.Key.foregroundColor: UIColor.black])
                sender.setAttributedTitle(title, for: .normal)
                sender.backgroundColor = .white
            }
        }
    }

Answer 1

您忘记更改第一种方法的第一个条件中的backgroundColor。为了防止更多此类问题，请尝试在函数中定义逻辑并在需要的任何地方调用它，而不是一遍又一遍地重写它：

override func viewDidLoad() {
    super.viewDidLoad()

    bookTitleFilterBtn.addTarget(self, action: #selector(buttonClicked(_:)), for: .touchUpInside)
    authorNameFilterBtn.addTarget(self, action: #selector(buttonClicked(_:)), for: .touchUpInside)
}

var buttons: [UIButton] { return [bookTitleFilterBtn, authorNameFilterBtn] }

func updateButtonsAppearance(allButtons: [UIButton], selectedButton: UIButton) {
    for button in allButtons {
        let isSelected = button == selectedButton

        let currentTitle = button.currentTitle ?? "-"
        let title = NSAttributedString(string: currentTitle, attributes: [.foregroundColor: isSelected ? UIColor.white : UIColor.black])
        button.setAttributedTitle(title, for: .normal)
        button.backgroundColor = isSelected ? .red : .white
        button.isHighlighted = isSelected
    }
}

@objc func buttonClicked(_ sender: UIButton) {
    DispatchQueue.main.async {
        self.updateButtonsAppearance(allButtons: buttons, selectedButton: sender)
    }
}

请注意，两个按钮现在都调用相同的函数。所以现在只有一个真相来源。如果它在某处有效，那么它在任何地方都有效。

Answer 2

您缺少以下代码行来更改另一个按钮的背景颜色。添加以下代码行。

//left button
@objc func bookTitleFilterBtnClicked(_ sender: UIButton) {
    DispatchQueue.main.async {
        if self.isHighlighted == false {
            ....
            ....
            authorNameFilterBtn.backgroundColor = .white

        } else {

            ....
        }
    }
}

//right button
@objc func authorNameFilterBtnClicked(_ sender: UIButton) {
    DispatchQueue.main.async {

        if self.isHighlighted == false {

            ....

            bookTitleFilterBtn.backgroundColor = .white
        } else {

            ....
        }
    }
}

此代码将改变按钮的颜色，反之亦然

Answer 3

设置从 StoryBoard 中选择的默认左按钮

var selectedButton:String = "" // gloable variable 

//left button
    @objc func bookTitleFilterBtnClicked(_ sender: UIButton) {

        if selectedButton != "제목"
        {
            selectedButton = "제목"
            sender.backgroundColor = .red
            let title = NSAttributedString(string: "제목", attributes: [NSAttributedString.Key.foregroundColor: UIColor.white])//title
            sender.setAttributedTitle(title, for: .normal)
            sender.isHighlighted = true
            self.isHighlighted = true

            authorNameFilterBtn.backgroundColor = .white
            let title1 = NSAttributedString(string: "작가", attributes: [NSAttributedString.Key.foregroundColor: UIColor.black])//title
            authorNameFilterBtn.setAttributedTitle(title1, for: .normal)
            authorNameFilterBtn.isHighlighted = false
            self.isHighlighted = false
        }
    }

    //right button
    @objc func authorNameFilterBtnClicked(_ sender: UIButton) {

        if selectedButton != "작가"
        {
            selectedButton = "작가"
            sender.isHighlighted = true
            let title = NSAttributedString(string: "작가", attributes: [NSAttributedString.Key.foregroundColor: UIColor.white])//Author
            sender.setAttributedTitle(title, for: .normal)
            sender.backgroundColor = .red
            self.isHighlighted = true

            bookTitleFilterBtn.isHighlighted = false
            self.isHighlighted = false
            let title1 = NSAttributedString(string: "제목", attributes: [NSAttributedString.Key.foregroundColor: UIColor.black])
            bookTitleFilterBtn.setAttributedTitle(title1, for: .normal)
            bookTitleFilterBtn.backgroundColor = .white

        }