在 Swift 中 - 表达式类型在没有更多上下文的情况下不明确

Question

func resetInfoPopUp() {
    if let resetInfo = self.viewModel.getResetInfo()
    {
        self.presentNotificationWithoutActionPopUpDelegate(title: resetInfo.title,
                                                   message: resetInfo.description,
                                                   infoImage: resetInfo.imageFileName,
                                                   delegate: self)
    }
}

我收到此错误 “表达式类型不明确，没有更多上下文”

这是我从 ViewController class.

调用的函数

func presentNotificationWithoutActionPopUpDelegate(title: NSAttributedString, 
                                                   message: NSAttributedString, 
                                                   infoImage: UIImage? = nil, 
                                                   delegate: PopUpActionDelegate? = nil) {

    let notificationViewController = NotificationViewWithoutActionViewController(title: title, 
     message: message, infoImage: infoImage)
 
    notificationViewController.gotItActionDelegate = delegate

    self.present(notificationViewController, animated: false, completion: nil)
}

NotificationViewWithoutActionViewController 是一个 viewcontroller class 声明弹出函数的地方。

@IBAction func acknowledgeAction() {
    gotItActionDelegate?.gotItButtonAction()
    self.dismiss(animated: true, completion: nil)
}

gotItButtonAction 是协议中定义的函数。

Check the image

 struct ResetInfo
  {
    var title: String
    var description: String
    var imageFileName: UIImage
  }

Answer 1

您的问题是您向 presentNotificationWithoutActionPopUpDelegate 函数传递了错误的参数。 String 与 NSAttributedString 不同。

要解决此问题，您可以这样做：

// Extension for convenient String conversion to NSAttributedString
extension String {
    var attributed: NSAttributedString {
        NSAttributedString(string: self)
    }
}

并像这样使用它：

let info = ResetInfo(...)
presentNotificationWithoutActionPopUpDelegate(
    title: info.title.attributed,
    message: info.description.attributed,
    ...
)

在 Swift 中 - 表达式类型在没有更多上下文的情况下不明确

In Swift - Type of expression is ambiguous without more context

swift

delegates

swift-protocols