无法让UILabel显示在UIView

时间：2018-03-08 04:02:23

标签： ios swift uilabel constraints

我正在尝试创建一个自定义视图，该视图由UIVabel顶部的UILabel组成。这个想法是一个小的弹出消息，标签与视图的大小基本相同。但是，每当我尝试将此自定义视图（由屏幕截图中屏幕底部的灰色小框表示）添加到另一个视图时，我只能显示UIView /深灰色背景，而不是标签。有人可以指出我正确的方向，因为我有点困惑，为什么下面的代码不起作用？感谢。

编辑：我应该指出，如果我用CGRect替换.zero（x：0，y：0，高度：100，宽度：50），我可以以某种形式显示标签，但我会有考虑到约束，将它设置为.zero会不会很好？

Screen shot 

import UIKit

class PopUp: UIView {
    var label: UILabel!
    var labelText: String!

    init(frame: CGRect, text: String) {
        super.init(frame: frame)

        self.labelText = text

        self.backgroundColor = .darkGray        

        self.label = UILabel(frame: .zero)
        self.label.textColor = UIColor.white
        self.label.text = self.labelText
        self.label.font = UIFont(name: "Times New Roman", size: 14.0)
        self.translatesAutoresizingMaskIntoConstraints = false // this should be "self.label.translatesAutoresizingMaskIntoConstraints"

        self.addSubview(self.label)
        self.bringSubview(toFront: self.label)

        NSLayoutConstraint.activate([
            self.label.topAnchor.constraint(equalTo: self.topAnchor),
            self.label.bottomAnchor.constraint(equalTo: self.bottomAnchor),
            self.label.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            self.label.trailingAnchor.constraint(equalTo: self.trailingAnchor)
        ])
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError()
    }
}

4 个答案:

答案 0 :(得分：0)

如果要将消息显示为弹出窗口，为什么不在UIViewController扩展中编写弹出窗口并在控制器中调用它？

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>


<style>
  .affix {
                position: fixed;
      top: 0;
      width: 100%;
      z-index: 9999 !important;
      background-color: #fff;
      align-content: flex-end;


        left: 0;
        right: 0;
        display: table;
        margin: 0 auto;
        max-width: calc(1170px); //container width - 30px padding
        word-wrap: break-word;


  }

  .lin
    {

    color:windowtext;
    font-size:8.0pt;
    font-style:normal;
    text-decoration:none;
    font-family:Arial, sans-serif;
    text-align:left;
    vertical-align:bottom;
    /*width:20px;*/
    }

  .sol
    {

    color:windowtext;
    font-size:8.0pt;
    font-style:normal;
    text-decoration:none;
    font-family:Arial, sans-serif;
    text-align:left;
    vertical-align:bottom;
    /*width:20px;*/
    }

</style>

</head>
<body>

<div class="container">
  <h2>sssssssssdhhdhdhd dddddd for Hello sssssssdd</h2>

  <table class="table table-striped" width:1170px>

    <thead data-spy="affix" data-offset-top="10">

      <tr>      
      <th>Current Rel<br/>
        Arssstecture<br/>
        fitrtyr<br/>
        of OS
        </th>

        <th>aupporz <br/>
            asdins</th>

        <th>aussorz <br/>
            znds</th>

        <th><br/>
        a34<br/>
        (IAas)<br/>
        31
        </th>

        <th>Pinux<br/>
        a86_64<br/>
        63
        </th>

        <th><br/>
        <br/>
        xCC
        </th>

         <th><br/>
        <br/>
        abc 
        </th>

        <th><br/>
        sd51<br/>
        (sdanium)<br/>
        64
        </th>

        <th>
        sdhetr<br/><br/>
        32
        </th>

        <th>
        sdhetr<br/><br/>
        64
        </th>

        <th>
        pun/aassssu<br/>
        aaaaa<br/>
        64<br/>
        </th>

        <th>
        pun<br/>
        a86_64<br/>
        14<br/>
        </th>

        <th>
        cIX<br/>
        weakiPC<br/>
        63<br/>
        </th>

        <th>
        aP<br/>
        aA <br/>
        aISC<br/>
        34<br/>
        </th>

        <th>
        pandows<br/>
        a16<br/>
        31<br/>
        </th>
      </tr>
    </thead>

    <tbody style="font-size:11px">
      <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>
       <tr>
      <td>asd 16.6 (9)</td>
        <td >10/24/1800</td>
        <td >3/31/1900</td>
        <td >NA</td>
        <td class = "lin">asdf5, asdf6, ssss 10, ssss 11</td>
        <td ></td>
         <td ></td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sdhetr 10 (34 dftOnly)</td>
        <td >NA</td>
        <td >NA</td>
        <td >NA</td>
        <td class = "sol">sd oiu, sdhetr 2008, Vist enterenter, winwins 7 (32/64)   
</td>
      </tr>




    </tbody>
    </table>
</div>



</body>

</html>

并在视图控制器中调用该函数：

extension UIViewController {
     func showPopup(text: String) {

          let popupView: UIView = {
              let view = UIView()
              view.backgroundColor = .darkGray
              view.translatesAutoresizingMaskIntoConstraints = false
              return view
          }()

          let textLabel: UILabel = {
              let label = UILabel()
              label.text = self.text
              label.font = UIFont(name: "Times New Roman", size: 14.0)
              label.textColor = UIColor.white
              label.translatesAutoresizingMaskIntoConstraints = false
              return label
          }()
          self.view.addSubview(popupView) 
          // add anchors to your popupView relative to your viewController here

          self.popupView.addSubView(textLabel)
          self.textLabel.topAnchor.constraint(equalTo: popupView.topAnchor).isActive = true
          self.textLabel.bottomAnchor.constraint(equalTo: popupView.bottomAnchor).isActive = true
          self.textLabel.leftAnchor.constraint(equalTo: popupView.leftAnchor).isActive = true
          self.textLabel.rightAnchor.constraint(equalTo: popupView.rightAnchor).isActive = true
    }
}

答案 1 :(得分：0)

初始化后将文本设置为标签

self.label = UILabel(frame: .zero)
self.labelText = text

您在初始化之前设置文本。

答案 2 :(得分：0)

问题：

我对你的剧本进行了一些测试，从头开始重写，并抓住了你的错误。

问题是，你没有导入字体＆＃34; Times New Roman＆＃34;。为此，您需要右键单击黄色文件夹，按Command + Shift + G，然后在以下位置键入：

/System/Library/Fonts/

然后，向下滚动，直到看到显示＆＃34; Times＆＃34;的字体，然后将其上传到Swift。

我还建议将标有"Times New Roman"的部分更改为"Times"

仍然无法使用？

如果它仍无效，那么您的代码就会出现问题。我能够从头开始重写你的脚本，它对我有用。如果它仍然无法正常工作，请尝试使用以下代码：

import UIKit
class ViewController: UIViewController {
    var popupLabel = UILabel()
    var popupBox = UIView()
    override func viewDidLoad() {
        view.addSubview(popupBox)
        popupBox.addSubview(popupLabel)
        popupBox.isHidden = true
        popupLabel.isHidden = true
        showPopup(CGPoint(x: 250 /* Change X Position */, y: 125 /* Change Y Position */), CGSize(width: 250 /* Change Width */, height: 100 /* Change Height */), "Blah" /* Change displayed text */)
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

func showPopup(_ rectPosition: CGPoint, _ rectSize: CGSize, _ popupDisplay: String) {
    popupBox.isHidden = false
    popupLabel.isHidden = false
    popupLabel.textColor = UIColor.white
    popupLabel.font = UIFont(name: "Times New Roman", size: 14.0)
    self.popupLabel.text = popupDisplay
    popupBox.frame.size = rectSize
    popupBox.center = rectPosition
    popupBox.backgroundColor = UIColor.darkGray
    popupLabel.frame.size = popupBox.frame.size
    popupLabel.textAlignment = .center
    popupLabel.center = popupBox.center
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
}

如果您要使用此代码，请将其放在ViewController.swift文件中，并考虑删除其他类。

答案 3 :(得分：0)

对不起，伙计们，我是个白痴。我一直盯着这段代码几个小时，无法弄清楚为什么事情不起作用。我终于意识到我的代码中有一个拼写错误。修复错字似乎已经成功了。谢谢大家的帮助！

原件：

self.translatesAutoresizingMaskIntoConstraints

修正：

self.label.translatesAutoresizingMaskIntoConstraints
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