swift - 类型 'error' 的值没有成员 'userinfo'

Question

我的代码如下:

if signupMode {
    let user = PFUser()
    user.username = emailTextField.text
    user.email = emailTextField.text
    user.password = passwordTextField.text
    user.signUpInBackground(block: {
       (success, error) in

if error != nil {

    let displayErrorMessage = "Please try again later"

    if let errorMessage = error.UserInfo["error"]? as String {
        displayErrorMessage = errorMessage                
    }

self.createAlert(title: "Error", message: "Parse Error")
}

我总是收到错误

"value of type 'error' has no member 'userinfo"

我可以做什么来解决这个问题？我正在使用 Xcode 8

Answer 1

如果您仍然收到此错误，请尝试此代码。强制将错误解包为 NSError。

if let errorMessage = (error! as NSError).userInfo["error"] as? String {
    displayErrorMessage = errorMessage
}