通知中心注册被删除(Notification hub registrations getting deleted)

 有一个更好的方法。 
 
 取两个按钮并将它们保存在stackView中并进行必要的设置。 
 
 但请确保两个按钮指向相同的动作。因此，用户似乎实际上只有一个按钮。 
 
 这是输出。 
 
  
 
 我刚刚在故事板中做到了这一点。 因为我正在使用stackView所以以编程方式创建和布局非常容易。 我想你可以做到。 :) 
 
 要停止闪烁： 
 
 使每个按钮类型自定义。 
 
 如何只对一个按钮执行一个按钮操作？ 
 
 看到这个流行的堆栈答案。 
 
 这是结果。 
 
  

I was able to put the two labels and get them highlighted when clicked by creating a UIButton other than .custom (for this example I used .roundedRect), setting a dummy title, adding subviews to the button title itself and setting their constraints as I wanted to. It works as expected.
 
Code:
 
class Button: UIView {

let button: UIButton
let leftLabel = UILabel()
let rightLabel = UILabel()

init() {
    button = UIButton(type: .roundedRect)
    super.init(frame: .zero)
    createButton()
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func createButton() {
    self.addSubview(button)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
    button.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
    button.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
    button.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true

    button.backgroundColor = UIColor.cyan
    button.layer.borderWidth = 0.5
    button.layer.borderColor = UIColor.blue.cgColor
    button.setTitle(" ", for: .normal)

    if let title = button.titleLabel {
        title.addSubview(rightLabel)
        rightLabel.text = "right"
        rightLabel.translatesAutoresizingMaskIntoConstraints = false
        rightLabel.topAnchor.constraint(equalTo: title.topAnchor).isActive = true
        rightLabel.leadingAnchor.constraint(greaterThanOrEqualTo: title.trailingAnchor).isActive = true
        rightLabel.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
        rightLabel.bottomAnchor.constraint(equalTo: title.bottomAnchor).isActive = true

        title.addSubview(leftLabel)
        leftLabel.text = "left"
        leftLabel.translatesAutoresizingMaskIntoConstraints = false
        leftLabel.topAnchor.constraint(equalTo: title.topAnchor).isActive = true
        leftLabel.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
        leftLabel.trailingAnchor.constraint(lessThanOrEqualTo: title.leadingAnchor).isActive = true
        leftLabel.bottomAnchor.constraint(equalTo: title.bottomAnchor).isActive = true
    }

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

func buttonTapped() {
    print("button tapped")
}