ios 添加一个简单的 UIAlertView
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Adding a simple UIAlertView
提问by Linuxmint
What is some starter code I could use to make a simple UIAlertView with one "OK" button on it?
我可以用什么入门代码来制作一个简单的 UIAlertView，上面有一个“确定”按钮？
回答by sudo rm -rf
When you want the alert to show, do this:
当您希望显示警报时，请执行以下操作：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"ROFL"
message:@"Dee dee doo doo."
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
// If you're not using ARC, you will need to release the alert view.
// [alert release];
If you want to do something when the button is clicked, implement this delegate method:
如果您想在单击按钮时执行某些操作，请实现此委托方法：
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
// the user clicked OK
if (buttonIndex == 0) {
// do something here...
}
}
And make sure your delegate conforms to UIAlertViewDelegateprotocol:
并确保您的代表符合UIAlertViewDelegate协议：
@interface YourViewController : UIViewController <UIAlertViewDelegate>
回答by FreeNickname
Other answers already provide information for iOS 7 and older, however UIAlertViewis deprecated in iOS 8.
其他答案已经提供了 iOS 7 及更早版本的信息，但UIAlertView在 iOS 8 中已弃用。
In iOS 8+ you should use UIAlertController. It is a replacement for both UIAlertViewand UIActionSheet. Documentation: UIAlertController Class Reference. And a nice article on NSHipster.
在 iOS 8+ 中，您应该使用UIAlertController. 这是一个为更换UIAlertView和UIActionSheet。文档：UIAlertController 类参考。还有一篇关于NSHipster的好文章。
To create a simple Alert View you can do the following:
要创建简单的警报视图，您可以执行以下操作：
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title"
message:@"Message"
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:@"Ok"
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
Swift 3 / 4 / 5:
斯威夫特 3 / 4 / 5：
let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .alert)
//We add buttons to the alert controller by creating UIAlertActions:
let actionOk = UIAlertAction(title: "OK",
style: .default,
handler: nil) //You can use a block here to handle a press on this button
alertController.addAction(actionOk)
self.present(alertController, animated: true, completion: nil)
Note, that, since it was added in iOS 8, this code won't work on iOS 7 and older. So, sadly, for now we have to use version checks like so:
请注意，由于它是在 iOS 8 中添加的，因此此代码不适用于 iOS 7 及更早版本。所以，遗憾的是，现在我们必须像这样使用版本检查：
NSString *alertTitle = @"Title";
NSString *alertMessage = @"Message";
NSString *alertOkButtonText = @"Ok";
if (@available(iOS 8, *)) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:alertTitle
message:alertMessage
delegate:nil
cancelButtonTitle:nil
otherButtonTitles:alertOkButtonText, nil];
[alertView show];
}
else {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:alertTitle
message:alertMessage
preferredStyle:UIAlertControllerStyleAlert];
//We add buttons to the alert controller by creating UIAlertActions:
UIAlertAction *actionOk = [UIAlertAction actionWithTitle:alertOkButtonText
style:UIAlertActionStyleDefault
handler:nil]; //You can use a block here to handle a press on this button
[alertController addAction:actionOk];
[self presentViewController:alertController animated:YES completion:nil];
}
Swift 3 / 4 / 5:
斯威夫特 3 / 4 / 5：
let alertTitle = "Title"
let alertMessage = "Message"
let alertOkButtonText = "Ok"
if #available(iOS 8, *) {
let alertController = UIAlertController(title: alertTitle, message: alertMessage, preferredStyle: .alert)
//We add buttons to the alert controller by creating UIAlertActions:
let actionOk = UIAlertAction(title: alertOkButtonText,
style: .default,
handler: nil) //You can use a block here to handle a press on this button
alertController.addAction(actionOk)
self.present(alertController, animated: true, completion: nil)
}
else {
let alertView = UIAlertView(title: alertTitle, message: alertMessage, delegate: nil, cancelButtonTitle: nil, otherButtonTitles: alertOkButtonText)
alertView.show()
}
UPD: updated for Swift 5. Replaced outdated class presence check with availability check in Obj-C.
UPD：针对 Swift 5 进行了更新。用 Obj-C 中的可用性检查替换了过时的类存在检查。
回答by Chanced270
UIAlertView is deprecated on iOS 8. Therefore, to create an alert on iOS 8 and above, it is recommended to use UIAlertController:
UIAlertView 在 iOS 8 上已被弃用。 因此，要在 iOS 8 及更高版本上创建警报，建议使用 UIAlertController：
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Title" message:@"Alert Message" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *defaultAction = [UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
// Enter code here
}];
[alert addAction:defaultAction];
// Present action where needed
[self presentViewController:alert animated:YES completion:nil];
This is how I have implemented it.
这就是我实施它的方式。
回答by Evan Mulawski
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Title"
message:@"Message"
delegate:nil //or self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert autorelease];
回答by Di Wu
As a supplementary to the two previous answers (of user "sudo rm -rf" and "Evan Mulawski"), if you don't want to do anything when your alert view is clicked, you can just allocate, show and release it. You don't have to declare the delegate protocol.
作为前两个答案（用户“sudo rm -rf”和“Evan Mulawski”）的补充，如果您不想在单击警报视图时执行任何操作，则可以只分配、显示和释放它。您不必声明委托协议。
回答by Brynner Ferreira
UIAlertView *myAlert = [[UIAlertView alloc]
initWithTitle:@"Title"
message:@"Message"
delegate:self
cancelButtonTitle:@"Cancel"
otherButtonTitles:@"Ok",nil];
[myAlert show];
回答by MGM
Here is a complete method that only has one button, an 'ok', to close the UIAlert:
这是一个完整的方法，只有一个按钮，一个“确定”，用于关闭 UIAlert：
- (void) myAlert: (NSString*)errorMessage
{
UIAlertView *myAlert = [[UIAlertView alloc]
initWithTitle:errorMessage
message:@""
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"ok", nil];
myAlert.cancelButtonIndex = -1;
[myAlert setTag:1000];
[myAlert show];
}
回答by rosewater
回答by Bhupendrasingh Lohar
Simple alert with array data:
带有数组数据的简单警报：
NSString *name = [[YourArray objectAtIndex:indexPath.row ]valueForKey:@"Name"];
NSString *msg = [[YourArray objectAtIndex:indexPath.row ]valueForKey:@"message"];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:name
message:msg
delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
回答by Nyakiba
For Swift 3:
对于 Swift 3：
let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
