Question

我想创建一个警告类型框，以便当用户尝试删除某些内容时，它会说“你确定”，然后如果他们确定则为是或否。在iPhone上做这个的最好方法是什么？

Answer 1

UIAlertView是最好的方法。它将动画显示在屏幕中间，使背景变暗，并强制用户解决它，然后返回到应用程序的正常功能。

您可以像这样创建UIAlertView：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Wait" message:@"Are you sure you want to delete this.  This action cannot be undone" delegate:self cancelButtonTitle:@"Delete" otherButtonTitles:@"Cancel", nil];
[alert show];

这将显示消息。

然后检查他们是否点击了删除或取消，请使用：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0){
        //delete it
    }
}

请确保在您的标题文件（.h）中，通过UIAlertViewDelegate添加<UIAlertViewDelegate>，在您的类继承的任何内容旁边（即。UIViewController或{ {1}}等。）

有关UITableViewController的所有细节的详情，请查看Apple's Docs Here

希望有所帮助

Answer 2

帖子很旧，但仍然是一个很好的问题。在iOS 8中，答案已经改变。今天你宁愿使用＆＃39; UIAlertController＆＃39;使用＆＃39; preferredStyle＆＃39; ＆＃39; UIAlertControllerStyle.ActionSheet＆＃39;。

这样的代码（swift）绑定到一个按钮：

@IBAction func resetClicked(sender: AnyObject) {
    let alert = UIAlertController(
        title: "Reset GameCenter Achievements",
        message: "Highscores and the Leaderboard are not affected.\nCannot be undone",
        preferredStyle: UIAlertControllerStyle.ActionSheet)
    alert.addAction(
        UIAlertAction(
            title: "Reset Achievements",
            style: UIAlertActionStyle.Destructive,
            handler: {
                (action: UIAlertAction!) -> Void in
                gameCenter.resetAchievements()
            }
        )
    )
    alert.addAction(
        UIAlertAction(
            title: "Show GameCenter",
            style: UIAlertActionStyle.Default,
            handler: {
                (action: UIAlertAction!) -> Void in
                self.gameCenterButtonClicked()
            }
        )
    )
    alert.addAction(
        UIAlertAction(
            title: "Cancel",
            style: UIAlertActionStyle.Cancel,
            handler: nil
        )
    )
    if let popoverController = alert.popoverPresentationController {
        popoverController.sourceView = sender as UIView
        popoverController.sourceRect = sender.bounds
    }
    self.presentViewController(alert, animated: true, completion: nil)
}

会产生这个输出： enter image description here

编辑：代码在iPad，iOS 8+上崩溃。如果按照此处所述添加必要的行：on another stack overflow answer

Answer 3

对于swift来说，它非常简单。

    //Creating the alert controller
    //It takes the title and the alert message and prefferred style
    let alertController = UIAlertController(title: "Hello  Coders", message: "Visit www.simplifiedios.net to learn xcode", preferredStyle: .Alert)

    //then we create a default action for the alert... 
    //It is actually a button and we have given the button text style and handler
    //currently handler is nil as we are not specifying any handler
    let defaultAction = UIAlertAction(title: "Close Alert", style: .Default, handler: nil)

    //now we are adding the default action to our alertcontroller
    alertController.addAction(defaultAction)

    //and finally presenting our alert using this method
    presentViewController(alertController, animated: true, completion: nil)

参考：iOS Show Alert Message

Answer 4

每个人都在说UIAlertView。但要确认删除，UIActionSheet可能是更好的选择。见When to use a UIAlertView vs. UIActionSheet

Answer 5

UIAlertView似乎是确认的明显选择。

将委托设置为控制器并实现UIAlertViewDelegate协议http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAlertViewDelegate_Protocol/UIAlertViewDelegate/UIAlertViewDelegate.html

Answer 6

使用UIAlertView class向用户显示警告消息。

Answer 7

使用UIAlertView：

UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Alert Title" 
                                                     message:@"are you sure?"
                                                    delegate:self 
                                           cancelButtonTitle:@"No"
                                           otherButtonTitles:@"Yes", nil];


        [av show];
        [av autorelease];

确保您实施：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

处理回应。

Answer 8

要弹出警报消息，请使用UIAlertView。

 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Wait" message:@"Are you sure you want to delete this." **delegate:self** cancelButtonTitle:@"Delete" otherButtonTitles:@"Cancel", nil];
[alert show];
[alert release];

将委托设置为self后，您可以对此方法执行操作

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

Answer 9

由于UIAlertView已被弃用，我想为未来的编码人员提供答案。

我会像UIAlertView一样使用UIAlertController而不是@IBAction func showAlert(_ sender: Any) { let alert = UIAlertController(title: "My Alert", message: "This is my alert", preferredStyle: UIAlertControllerStyle.alert) alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: {(action) in alert.dismiss(animated: true, completion: nil) })) self.present(alert,animated:true, completion:nil) }：

{{1}}

Answer 10

在这里，我提供了警报消息，我在第一个应用程序中使用了该消息：

@IBAction func showMessage(sender: UIButton) {
    let alertController = UIAlertController(title: "Welcome to My First App",
                              message: "Hello World",
                              preferredStyle: UIAlertControllerStyle.alert)
    alertController.addAction(UIAlertAction(title: "OK",
                                            style: UIAlertActionStyle.default,
                                            handler: nil))
    present(alertController, animated: true, completion: nil)
}

使用适当的处理程序进行用户响应。

如何在iPhone中创建警报框？

10 个答案: