ios - 如何将标题从 UIAlertAction 发送到另一个 UIViewController 作为该 VC 的标题

Question

我有一个带有 4 个选项的 UIAlertController。当我选择其中任何一个选项时，我想将该选项的名称作为该 ViewController 的标题发送到下一个 ViewController。

这是我的代码:

func showOptions(){

    let actionSheet = UIAlertController(
        title: "Select a type of inspection",
        message: nil,
        preferredStyle: .actionSheet
    )
    let cancel = UIAlertAction(
        title: "Cancel",
        style: .cancel,
        handler: nil
    )

    let copyOfVehicleShortCheck = UIAlertAction(
        title: "Copy of Vehicle Short Check",
        style: .default
    ) { action in
        self.performSegue(
            withIdentifier: Constants.checklistInspectionIdentifier,
            sender: self
        )
    }

    let fullDailyDefect = UIAlertAction(
        title: "Full Daily Defect and Damage Check",
        style: .default
    ) { action in
        self.performSegue(
            withIdentifier: Constants.checklistInspectionIdentifier,
            sender: self
        )
    }

    let licenceCheck = UIAlertAction(
        title: "Licence Check Y/N",
        style: .default
    ) { action in
        self.performSegue(
            withIdentifier: Constants.checklistInspectionIdentifier,
            sender: self
        )
    }

    let vehicleShortCheck = UIAlertAction(
        title: "Vehicle Short Check",
        style: .default
    ) { action in
        self.performSegue(
            withIdentifier: Constants.checklistInspectionIdentifier,
            sender: self
        )
    }

    actionSheet.addAction(copyOfVehicleShortCheck)
    actionSheet.addAction(fullDailyDefect)
    actionSheet.addAction(licenceCheck)
    actionSheet.addAction(vehicleShortCheck)
    actionSheet.addAction(cancel)

    self.present(actionSheet, animated: true, completion: nil)
}

可以将参数 title 从 UIAlertAction 发送到下一个 ViewController 吗？

Answer 1

正如@Sh_Khan 所指出的，要获得您需要action.title 的标题。

我的回答是一个附加组件，因为从您的问题和代码来看，您并不清楚您是否知道如何执行此操作。

要真正将标题从一个 VC 发送到另一个 VC，您需要覆盖 prepareForSegue 方法。

创建一个全局变量:

var selectedTitle = ""

在 Action 处理程序集中:

selectedTitle = action.title

在目标 View Controller 中创建一个新属性:

var title = ""

并覆盖 prepareForSegue:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   if segue.identifier == "insert your identifier here" {
      if let vc = segue.destination as? YourDestinationViewController {
          vc.title = selectedTitle
          print("Title set in destination VC")
      }
   }
}