UIAlertView' 在 iOS 9.0 中已弃用答案

【问题标题】：UIAlertView' was deprecated in iOS 9.0UIAlertView' 在 iOS 9.0 中已弃用
【发布时间】：2016-01-14 00:05:43
【问题描述】：

我尝试了几种方法来使用 UIAlertController，而不是 UIAlertView，但我无法发出警报。提前感谢您提供任何进一步的建议。我是新手。

UIAlertView' 在 iOS 9.0 中已弃用：UIAlertView 已弃用。将 UIAlertController 与 UIAlertControllerStyleAlert 的首选样式一起使用

这是我的代码：

import MessageUI

class SecondViewController: UIViewController,MFMailComposeViewControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func sendmail(sender: UIButton) {
           let mailComposeViewController = configuredMailComposeViewController()
        if MFMailComposeViewController.canSendMail() {
            self.presentViewController(mailComposeViewController, animated: true, completion: nil)
        } else {
            self.showSendMailErrorAlert()
        }
    }

    func configuredMailComposeViewController() -> MFMailComposeViewController {
        let mailComposerVC = MFMailComposeViewController()
        mailComposerVC.mailComposeDelegate = self // Extremely important to set the --mailComposeDelegate-- property, NOT the --delegate-- property

        mailComposerVC.setToRecipients(["blabla@gmail.com"])
        mailComposerVC.setSubject("App Feedback")
        mailComposerVC.setMessageBody("Feature request or bug report?", isHTML: false)

        return mailComposerVC
    }

    func showSendMailErrorAlert() {
        let sendMailErrorAlert = UIAlertView(title: "Could Not Send Email", message: "Your device could not send e-mail.  Please check e-mail configuration and try again.", delegate: self, cancelButtonTitle: "OK")
        sendMailErrorAlert.show()
    }

    // MARK: MFMailComposeViewControllerDelegate Method
    func mailComposeController(controller: MFMailComposeViewController, didFinishWithResult result: MFMailComposeResult, error: NSError?) {
        controller.dismissViewControllerAnimated(true, completion: nil)
    }
}

【问题讨论】：

什么不起作用？我看到了您的UIAlertView 代码，但没有看到您对UIAlertController 的尝试。周围有很多教程。 Here 就是一个例子。
更新您的问题，尝试使用UIAlertController。解释你遇到了什么问题。并进行一些搜索。使用UIAlertController的例子数不胜数。

标签： ios uialertview ios9 deprecated

【解决方案1】：

使用 UIAlertController

这里是一个例子：

   //Create the AlertController
  let actionSheetController: UIAlertController = UIAlertController(title: "Alert", message: "Swiftly Now! Choose an option!", preferredStyle: .Alert)

  //Create and add the Cancel action
  let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel) { action -> Void in
    //Do some stuff
    }
  actionSheetController.addAction(cancelAction)
    //Create and an option action
  let nextAction: UIAlertAction = UIAlertAction(title: "Next", style: .Default) { action -> Void in
    //Do some other stuff
    }
  actionSheetController.addAction(nextAction)
  //Add a text field
  actionSheetController.addTextFieldWithConfigurationHandler { textField -> Void in
       //TextField configuration
     textField.textColor = UIColor.blueColor()
   }

   //Present the AlertController
   self.presentViewController(actionSheetController, animated: true, completion: nil)

【讨论】：

【解决方案2】：

试试这样的...

let sendMailErrorAlert = UIAlertController(title: "Could Not Send Email", message: "Your device could not send e-mail.  Please check e-mail configuration and try again.", preferredStyle: .Alert)

self.presentViewController(sendMailErrorAlert, animated: true, completion: nil)

【讨论】：

【解决方案3】：

    let alertController = UIAlertController(title: "Could Not Send Email
     ", message: "Your device could not send e-mail.  Please check e-mail configuration and try again.", preferredStyle: .Alert)

使用 UIAlertController 初始化后将操作添加到警报控制器。 UIAlertCOntroller 是 UIViewController 的子类。所以你可以使用 self.presentViewController 方法在当前控制器上显示警报。

【讨论】：