ios - 用 subview 隐藏彩色边框

Question

我有带彩色边框的 uiview。我想在上面添加一个 subview ，所以它“隐藏”了父 View 边框。目前，当我尝试在上面添加一个 View (UILabel 的子类)时，它不会像我想要的那样重叠任何东西。我想要的是在与标签框架交互时删除白线。

我的类(class)是:

class LabeledContainerView: UIView {

  var text: String!
  var height: CGFloat!
  var offset: CGFloat!

  var label: UILabel = {
    let lbl = LabelSL.create(textColor: Theme.Color.white,
                               font: Theme.Font.regular())
    lbl.text = Strings.login.value
    lbl.backgroundColor = Theme.Color.clear.value
    return lbl
  }()

  init(text: String,
       height: Double,
       offset: Double) {
    super.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
    self.text = text
    self.height = CGFloat(height)
    self.offset = CGFloat(offset)
    createUI()
    setConstraints()
  }

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
  }

  func highlight(){

  }

  func turnOffHighlight(){

  }

  private func createUI(){
    translatesAutoresizingMaskIntoConstraints = false
    clipsToBounds = false
    layer.cornerRadius = 4.0
    layer.borderColor = UIColor.white.cgColor
    layer.borderWidth = 2.0
    addSubview(label)
  }

  private func setConstraints(){
    let tinyOffset: CGFloat = 2

    label.leftAnchor.constraint(equalTo: leftAnchor, constant: offset + tinyOffset).isActive = true
    label.centerYAnchor.constraint(equalTo: topAnchor).isActive = true
  }
}

Answer 1

您无需在其上方添加其他 View 即可做到这一点。然后将您的文本字段委托(delegate)设置为 self

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    if textField.text?.isEmpty ?? false{
        //yourView.hideBorders
    }
}

如果我没明白你的意思，请澄清