ios 如何在 iphone 中创建警报框？
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How to create an alert box in iphone?
提问by Blane Townsend
I would like to make an alert type box so that when the user tries to delete something, it says, "are you sure" and then has a yes or no for if they are sure. What would be the best way to do this in iphone?
我想制作一个警报类型框，以便当用户尝试删除某些内容时，它会说“你确定吗”，然后如果他们确定的话，就会有一个是或否。在 iphone 中执行此操作的最佳方法是什么？
回答by Andrew
A UIAlertViewis the best way to do that. It will animate into the middle of the screen, dim the background, and force the user to address it, before returning to the normal functions of your app.
AUIAlertView是最好的方法。在返回到应用程序的正常功能之前，它会在屏幕中间设置动画，使背景变暗，并强制用户解决它。
You can create a UIAlertViewlike this:
你可以创建一个UIAlertView这样的：
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];
That will display the message.
这将显示消息。
Then to check whether they tapped delete or cancel, use this:
然后要检查他们是否点击了删除或取消，请使用以下命令：
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (buttonIndex == 0){
//delete it
}
}
Make sure in your header file (.h), you include the UIAlertViewDelegateby putting <UIAlertViewDelegate>, next to whatever your class inherits from (ie. UIViewControlleror UITableViewController, etc.)
确保在您的头文件 ( .h) 中，UIAlertViewDelegate通过将<UIAlertViewDelegate>,包含在您的类继承自的任何内容旁边（即UIViewController或UITableViewController等）
For more infomation on all the specifics of UIAlertViewscheck out Apple's Docs Here
有关在此处UIAlertViews查看Apple 文档的所有细节的更多信息
Hope that helps
希望有帮助
回答by jboi
The post is quite old, but still a good question. With iOS 8 the answer has changed. Today you'd rather use 'UIAlertController' with a 'preferredStyle' of 'UIAlertControllerStyle.ActionSheet'.
帖子很老了，但仍然是一个好问题。在 iOS 8 中，答案发生了变化。今天，您更愿意使用带有“UIAlertControllerStyle.ActionSheet”的“preferredStyle”的“UIAlertController”。
A code like this (swift) that is bound to a button:
像这样（swift）绑定到按钮的代码：
@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)
}
would produce this output:
会产生这个输出：
EDIT: The code crashed on iPad, iOS 8+. If added the necessary lines as described here: on another stack overflow answer
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
回答by Shaba Aafreen
For swift it is very simple.
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 显示警报消息
回答by Jon Reid
Everyone's saying UIAlertView. But to confirm deletion, UIActionSheet is likely the better choice. See When to use a UIAlertView vs. UIActionSheet
每个人都在说 UIAlertView。但是要确认删除，UIActionSheet 可能是更好的选择。查看何时使用 UIAlertView 与 UIActionSheet
回答by Anand
To pop an alert message use UIAlertView.
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];
Once you set the delegate as self you can perform your action on this method
将委托设置为 self 后，您可以在此方法上执行操作
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
回答by danner.tech
Being that UIAlertViewis now deprecated, I wanted to provide an answer to future coders that come across this.
由于UIAlertView现在已弃用，我想为将来遇到此问题的编码人员提供答案。
Instead of UIAlertView, I would use UIAlertControllerlike so:
而不是UIAlertView，我会UIAlertController像这样使用：
@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)
}
回答by InsertWittyName
UIAlertView seems the obvious choice for confirmation.
UIAlertView 似乎是确认的明显选择。
Set the delegate to the controller and implement the UIAlertViewDelegate protocol http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAlertViewDelegate_Protocol/UIAlertViewDelegate/UIAlertViewDelegate.html
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
回答by Black Frog
Use the UIAlertView classto display an alert message to the user.
使用UIAlertView 类向用户显示警报消息。
回答by Richard Stelling
Use an UIAlertView:
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];
Make sure you implement:
确保您实施：
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
To handle the response.
来处理响应。
回答by Pallavi
Here i provided the alert message, which i used in my first app:
在这里，我提供了我在第一个应用程序中使用的警报消息：
@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)
}
with appropriate handlers for user responses.
为用户响应提供适当的处理程序。
