我一直收到这个错误 'UIAlertView' was deprecated in iOS 9.0”

Question

不断收到此错误：

'UIAlertView' was deprecated in iOS 9.0: UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead

有人可以帮我编辑这段代码吗？

    if #available(iOS 8.0, *) {
        let alert = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: UIAlertControllerStyle.alert)


        alert.addAction(UIAlertAction(title: alertOKTitle, style:.destructive, handler: { alertAction in
            self.okButtonPressed()
            alert.dismiss(animated: true, completion: nil)
        }))

        alert.addAction(UIAlertAction(title: alertCancelTitle, style:.cancel, handler:{ alertAction in
            self.cancelButtonPressed()
            alert.dismiss(animated: true, completion: nil)
        }))

        alert.addAction(UIAlertAction(title: alertRemindLaterTitle, style:.default, handler: { alertAction in
            self.remindLaterButtonPressed()
            alert.dismiss(animated: true, completion: nil)
        }))

        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        let controller = appDelegate.window?.rootViewController

        controller?.present(alert, animated: true, completion: nil)
    } else {
        let alert = UIAlertView()
        alert.title = alertTitle
        alert.message = alertMessage
        alert.addButton(withTitle: alertCancelTitle)
        alert.addButton(withTitle: alertRemindLaterTitle)
        alert.addButton(withTitle: alertOKTitle)
        alert.delegate = self
        alert.show()
    }


}

internal func alertView(_ alertView: UIAlertView , clickedButtonAt buttonIndex: Int){

    if(buttonIndex == 0)
    {
        cancelButtonPressed()
    }
    else if(buttonIndex == 1)
    {
        remindLaterButtonPressed()
    }
    else if(buttonIndex == 2)
    {
        okButtonPressed()
    }

    alertView.dismiss(withClickedButtonIndex: buttonIndex, animated: true)

}

Answer 1

如错误所述，UIAlertView 自 iOS 9.0 起已弃用。 UIAlertController 是在 iOS 8.0 中添加的。您的代码正确选择在 iOS 8.0 或更高版本下使用 UIAlertController。

问题是您的代码尝试对 iOS 8.0 之前的任何内容使用 UIAlertView。但是您的应用程序的部署目标未设置为 iOS 7 或更早版本。因此，编译器告诉您 UIAlertView 已被弃用。

由于您实际上不会支持任何早于 iOS 8.0 的版本，因此不需要 if #available(iOS 8.0, *) 或 UIAlertView。只需使用 UIAlertController 编写代码，不用担心 UIAlertView.

您发布的所有代码都可以简化为 UIAlertController 部分：

let alert = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: UIAlertControllerStyle.alert)

alert.addAction(UIAlertAction(title: alertOKTitle, style:.destructive, handler: { alertAction in
    self.okButtonPressed()
    alert.dismiss(animated: true, completion: nil)
}))

alert.addAction(UIAlertAction(title: alertCancelTitle, style:.cancel, handler:{ alertAction in
    self.cancelButtonPressed()
    alert.dismiss(animated: true, completion: nil)
}))

alert.addAction(UIAlertAction(title: alertRemindLaterTitle, style:.default, handler: { alertAction in
    self.remindLaterButtonPressed()
    alert.dismiss(animated: true, completion: nil)
}))

let appDelegate = UIApplication.shared.delegate as! AppDelegate
let controller = appDelegate.window?.rootViewController

controller?.present(alert, animated: true, completion: nil)

我一直收到这个错误 'UIAlertView' was deprecated in iOS 9.0”

I keep getting this error 'UIAlertView' was deprecated in iOS 9.0"

uialertview

ios

swift

uialertcontroller