ios - 隐藏和显示( subview )按钮或更改标题？

Question

我的 subview 有问题。我有 2 个可见按钮和 1 个应该在单击第一个按钮后显示。更准确地说，我有开始按钮、重置按钮和停止按钮。加载时应该只显示开始和重置按钮，但是当我按下开始按钮时，重置按钮应该隐藏，停止按钮应该显示。像 isHidden 这样的语法不起作用。有什么问题？

星标、停止和重置按钮:

 var stopButton: UIButton{

    let stopButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100))
    stopButton.backgroundColor = .white
    stopButton.setTitle("Stop", for: .normal)
    stopButton.addTarget(self, action: #selector(stopButtonAction), for: .touchUpInside)
    stopButton.layer.cornerRadius = 50
    stopButton.layer.masksToBounds = true
    stopButton.isHidden = true

    return stopButton
}

var resetButton: UIButton{

    let resetButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100))
    resetButton.backgroundColor = .red
    resetButton.setTitle("Reset", for: .normal)
    resetButton.addTarget(self, action: #selector(resetButtonAction), for: .touchUpInside)
    resetButton.layer.cornerRadius = 50
    resetButton.layer.masksToBounds = true

    return resetButton
}

var startButton: UIButton{

    let startButton = UIButton(frame: CGRect(x: 50, y: 50, width: 100, height: 100))
    startButton.backgroundColor = .green
    startButton.setTitle("Start", for: .normal)
    startButton.addTarget(self, action: #selector(startButtonAction), for: .touchUpInside)
    startButton.layer.cornerRadius = 50
    startButton.layer.masksToBounds = true

    return startButton
}

我在这里添加了这个 subview (这个函数还添加了 UIView，它在 viewDidLoad 中被调用):

func addBottomView()
{
    let orginX = (collectionView?.frame.minX)!
    let orginY = (collectionView?.frame.maxY)!
    let heightOfView = view.frame.height - (view.frame.height / 100) * 70

    let bottomView = UIView(frame: CGRect(x: orginX, y: orginY, width: view.frame.width, height: heightOfView))
    bottomView.backgroundColor = .orange

    view.addSubview(bottomView)

    bottomView.addSubview(stopButton)
    bottomView.addSubview(startButton)
    bottomView.addSubview(resetButton)


}

这是我连接到这个按钮的功能:

  func startButtonAction()
{
    blinkAction()
    print("START ACTION")

    resetButton.isHidden = true
    stopButton.isHidden = false
    view.layoutSubviews()
}

func resetButtonAction()
{
   print("RESET ACTION")
   blinkAction()

}
func stopButtonAction()
{
    print("STOP ACTION")
    blinkAction()

    resetButton.isHidden = false
    stopButton.isHidden = true
    view.layoutSubviews()

}

我添加了 layoutSubviews 方法，但它没有帮助。我也尝试在隐藏的按钮名称之前使用 self，但我也不起作用。有什么建议吗？

Answer 1

您可以使用带有惰性键盘的计算属性创建按钮

lazy var stopButton: UIButton = {
        let stopButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100))
        stopButton.backgroundColor = .yellow
        stopButton.setTitle("Stop", for: .normal)
        stopButton.addTarget(self, action: #selector(stopButtonAction), for: .touchUpInside)
        stopButton.layer.cornerRadius = 50
        stopButton.isHidden = true
        stopButton.layer.masksToBounds = true
        return stopButton
    }()

    lazy var resetButton: UIButton = {
        let resetButton = UIButton(frame: CGRect(x: 220, y: 50, width: 100, height: 100))
        resetButton.backgroundColor = .red
        resetButton.setTitle("Reset", for: .normal)
        resetButton.addTarget(self, action: #selector(resetButtonAction), for: .touchUpInside)
        resetButton.layer.cornerRadius = 50
        resetButton.layer.masksToBounds = true
        return resetButton
    }()

    lazy var startButton: UIButton = {
        let startButton = UIButton(frame: CGRect(x: 50, y: 50, width: 100, height: 100))
        startButton.backgroundColor = .green
        startButton.setTitle("Start", for: .normal)
        startButton.addTarget(self, action: #selector(startButtonAction), for: .touchUpInside)
        startButton.layer.cornerRadius = 50
        startButton.layer.masksToBounds = true
        return startButton
    }()