（NSObject，AnyObject）is not convertible to DictionaryIndex <NSObject，AnyObject>

Question

我正在從Objective-C教程轉換此委託協議功能，但遇到了一個錯誤，試圖通過使用下標返回基於密鑰的值。我不太確定這裏的錯誤是什麼意思。任何幫助將不勝感激！

// 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

您沒有發佈您的聲明。

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