(NSObject, AnyObject) 不能转换为 DictionaryIndex<NSObject, AnyObject>

Question

我正在从 Objective-C 教程转换此委托协议函数，但在尝试通过使用下标返回基于键的值来访问字典中的值时遇到错误。我不太确定这里的错误是什么意思。任何帮助将不胜感激！

// Sent to the delegate to determine whether the sign up request should be submitted to the server
func signUpViewController(signUpController: PFSignUpViewController!, shouldBeginSignUp info: [NSObject : AnyObject]!) -> Bool {
  var informationComplete: Bool = true

  // Loop through all of the submitted data
  for key in info {
    var field: String = info[key] // Error occurs at this line on info
    if field.isEmpty {
      informationComplete = false
      break
    }
  }

  // Display an alert if a field was not completed
  if !informationComplete {
    let alertView: UIAlertView = UIAlertView(title: "Missing Information", message: "Please make sure all information is filled out!", delegate: nil, cancelButtonTitle: "ok")
  }

  return informationComplete
}

Answer 1

您没有发布声明。但很可能您可以通过以下方式解决它：

for (key, field) in info {
  if field.isEmpty {
    informationComplete = false
    break
  }
}