任何人都可以帮助我们解决这些 Xcode 错误吗？

欢迎来到 SO :) 下次请在问题中发布您的代码，您也可以嵌入您的图像文件以帮助我们更轻松地查看您的问题。

您忘记添加“：” Website(sender: AnyObject)

在下一行，您将“{”一行放得太远了。它需要放在 if 语句的末尾，而不是在UIApplication.sharedApplication....

还有一些其他标点符号错误。

When you see an error saying "override can only be used in a class" that typically means you forgot a closing brace somewhere (which you did). You can select the whole program then do "Editor -> Structure -> Re-indent" which will help you to see where the scope issue is (this is how I fixed the override issue).

Make sure to read and pay attention to your error messages.. one of them clearly tells you that you are missing the "{" after your if statement, and when you see "expected expression" that means that whatever you wrote was gibberish to Swift (meaning you had a typo most likely, or left something incomplete).

我继续为您编辑了您的问题，并修复了您的代码。我几乎没有使用过你正在使用的任何东西（我编写游戏），但我只是按照 Xcode 给我的指示（中间有点的那些告诉你如何修复它）：

class ViewController: UIViewController {
  @IBOutlet weak var emailField: UITextField!
  @IBOutlet weak var passwordField: UITextField!
  @IBOutlet weak var myWebView: UIWebView!

  @IBAction func Website(sender: AnyObject) {

    if let url = URL(string: "http://www.sermonaudio.com/source_detail.asp?sourceid=cfbc1") {
      UIApplication.shared.openURL(url)
    }
  }
  var userUid: String!

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    getVideo(videoCode: "qS6tvqL1N24")
  }

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

  func goToCreateUserVC(){
    performSegue(withIdentifier: "Feed", sender: nil)
  }
  func goToFeedVC() {
    performSegue(withIdentifier: "Feed", sender: nil)
  }
  func getVideo(videoCode:String!)
  {
    let url = URL(string: "https://www.youtube.com/embed/\(videoCode)")
    myWebView.loadRequest(URLRequest(url: url!))
  }
  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "SignUp" {
      if let destination = segue.destination as? UserVC {
        if userUid != nil {
          destination.userUid = userUid
        }
        if emailField.text != nil {
          destination.emailField = emailField.text
        }
        if passwordField.text != nil {
          destination.passwordField = passwordField.text
        }
      }
    }
  }

  @IBAction func signInTapped(_ sender: Any){
    if let email = emailField.text, let password = passwordField.text {
      FIRAuth.auth()?.signIn(withEmail: email, password: password, completion:
        { (user,error) in
          if error == nil {
            if let user = user {
              self.userUid = user.uid
              self.goSignUpVC()
            }
          } else {
            self.goToCreateUserVC()
          }
      });
    }
  }
}

此外，看起来这是较旧的 Swift 代码，因此您会收到错误消息。尝试查找用 Swift 3 编写的教程（或下载较旧的 Xcode）。

教程很棒，但很少教你如何解决问题。那是您必须依赖调试器和 Xcode 错误的时候。尝试在此处搜索您的错误，如果您仍然遇到问题，那么您可以随时发布问题：P

祝你的应用程序好运！