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

Question

我当时正在从Objective-C教程转换此委托协议函数，但是在尝试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。 但是可能您可以使用以下方法解决它：

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