I have been working to create a UIAlertView in Swift, but for some reason I can&#39;t get the statement right because I&#39;m getting this error: 

&gt; Could not find an overload for &#39;init&#39; that accepts the supplied
&gt; arguments

Here is how I have it written:

    let button2Alert: UIAlertView = UIAlertView(title: &quot;Title&quot;, message: &quot;message&quot;,
                         delegate: self, cancelButtonTitle: &quot;OK&quot;, otherButtonTitles: nil)

Then to call it I&#39;m using:

    button2Alert.show()

As of right now it is crashing and I just can&#39;t seem to get the syntax right. 

How would I create a UIAlertView in Swift?

Scenario: The user taps on a button on a view controller. The view controller is the topmost (obviously) in the navigation stack. The tap invokes a utility class method called on another class. A bad thing happens there and I want to display an alert right there before control returns to the view controller.

    + (void)myUtilityMethod {
        // do stuff
        // something bad happened, display an alert.
    }

This was possible with `UIAlertView` (but perhaps not quite proper). 

In this case, how do you present a `UIAlertController`, right there in `myUtilityMethod`? 

How to present UIAlertController when not in a view controller?

With iOS 8.0, Apple introduced [UIAlertController](https://developer.apple.com/library/prerelease/iOS/documentation/UIKit/Reference/UIAlertController_class/index.html) to replace [UIActionSheet](https://developer.apple.com/library/ios/documentation/uikit/reference/uiactionsheet_class/Reference/Reference.html). Unfortunately, Apple didn&#39;t add any information on how to present it. I found an [entry](http://hayageek.com/uialertcontroller-example-ios/) about it on hayaGeek&#39;s blog, however, it doesn&#39;t seem to work on iPad. The view is totally misplaced:

Misplaced:
![Misplaced image][1]

Correct:
![enter image description here][2]


  [1]: http://i.stack.imgur.com/KhAaj.png
  [2]: http://i.stack.imgur.com/lFd3S.png

I use the following code to show it on the interface:

        let alert = UIAlertController()
        // setting buttons
        self.presentModalViewController(alert, animated: true)

Is there another way to add it for iPad? Or did Apple just forget the iPad, or not implemented, yet?

Presenting a UIAlertController properly on an iPad using iOS 8

I&#39;m trying to make an alert message with input, and then get the value from the input. I&#39;ve found many good tutorials how to make the input text field. but I can&#39;t get the value from the alert.


Get input value from TextField in iOS alert in Swift

On iOS 12.2, while using `UIAlertController`&#39;s `actionSheet`, Xcode gives constraint error. Anyone having this problem?

This same code runs on iOS 12.1 with no error.

I have tested this code on Xcode 10.2 and 10.1.

``` Swift
class ViewController: UIViewController {
    
    let Click : UIButton = {
        let button = UIButton(type: UIButton.ButtonType.system)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle(&quot;OK&quot;, for: .normal)
        button.tintColor = UIColor.blue
        button.addTarget(self, action: #selector(click(_:)), for: UIControl.Event.touchUpInside)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(Click)
        Click.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        Click.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    }

    
    @objc func click(_ sender: UIButton) {
        let optionMenu = UIAlertController(title: nil, message: &quot;Choose Option&quot;, preferredStyle: .actionSheet)
        
        let deleteAction = UIAlertAction(title: &quot;Delete&quot;, style: .default)
        let saveAction = UIAlertAction(title: &quot;Save&quot;, style: .default)
    
        let cancelAction = UIAlertAction(title: &quot;Cancel&quot;, style: .cancel)
        
        optionMenu.addAction(deleteAction)
        optionMenu.addAction(saveAction)
        optionMenu.addAction(cancelAction)
        
        self.present(optionMenu, animated: true, completion: nil)
    }

}
```

```
[LayoutConstraints] Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don&#39;t want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don&#39;t expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    &quot;&lt;NSLayoutConstraint:0x6000001b6ee0 UIView:0x7fe3b6513020.width == - 16   (active)&gt;&quot;
)

Will attempt to recover by breaking constraint 
&lt;NSLayoutConstraint:0x6000001b6ee0 UIView:0x7fe3b6513020.width == - 16   (active)&gt;
```

PS: 

Just to make sure that the problem is on `UIAlertController`, I removed everything and updated the code as below, but I received the same error:

```Swift
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        let optionMenu = UIAlertController(title: &quot;Test&quot;, message: &quot;Choose Option&quot;, preferredStyle: .actionSheet)
        
        let deleteAction = UIAlertAction(title: &quot;Delete&quot;, style: .default)
        let saveAction = UIAlertAction(title: &quot;Save&quot;, style: .default)
        
        let cancelAction = UIAlertAction(title: &quot;Cancel&quot;, style: .cancel)
        
        optionMenu.addAction(deleteAction)
        optionMenu.addAction(saveAction)
        optionMenu.addAction(cancelAction)
        
        self.present(optionMenu, animated: true, completion: nil)
    }
    
}
```

UIAlertController&#39;s actionSheet gives constraint error on iOS 12.2 / 12.3

I am using new UIAlertController for showing alerts. I have this code:

    // nil titles break alert interface on iOS 8.0, so we&#39;ll be using empty strings
    UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @&quot;&quot;: title message: message preferredStyle: UIAlertControllerStyleAlert];
        
        
    UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle style: UIAlertActionStyleCancel handler: nil];
        
    [alert addAction: defaultAction];
        
    UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
    [rootViewController presentViewController:alert animated:YES completion:nil];

Now I want to change title and message font, color, size and so. What&#39;s best way to do this?

**Edit:**
I should insert whole code. I created category for UIView that I could show right alert for iOS version.

    @implementation UIView (AlertCompatibility)
    
    +( void )showSimpleAlertWithTitle:( NSString * )title
                              message:( NSString * )message
                    cancelButtonTitle:( NSString * )cancelButtonTitle
    {
        float iOSVersion = [[UIDevice currentDevice].systemVersion floatValue];
        if (iOSVersion &lt; 8.0f)
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle: title
                                                            message: message
                                                           delegate: nil
                                                  cancelButtonTitle: cancelButtonTitle
                                                  otherButtonTitles: nil];
            [alert show];
        }
        else
        {
            // nil titles break alert interface on iOS 8.0, so we&#39;ll be using empty strings
            UIAlertController *alert = [UIAlertController alertControllerWithTitle: title == nil ? @&quot;&quot;: title
                                                                           message: message
                                                                    preferredStyle: UIAlertControllerStyleAlert];
            
            
            UIAlertAction *defaultAction = [UIAlertAction actionWithTitle: cancelButtonTitle
                                                                    style: UIAlertActionStyleCancel
                                                                  handler: nil];
            
            [alert addAction: defaultAction];
            
            UIViewController *rootViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
            [rootViewController presentViewController:alert animated:YES completion:nil];
        }
    }

UIAlertController custom font, size, color

I have a tableview which, when loaded, each cell could possibly return an NSError, which I have chosen to display in a UIAlertController.  Problem is I get this error in the console if multiple errors are returned.

&gt; Warning: Attempt to present UIAlertController: 0x14e64cb00  on MessagesMasterVC: 0x14e53d800 which is already presenting (null)

Ideally, I would ideally like to handle this in my UIAlertController extension method.

    class func simpleAlertWithMessage(message: String!) -&gt; UIAlertController {
		
		let alertController = UIAlertController(title: nil, message: message, preferredStyle: UIAlertControllerStyle.Alert)
		let cancel = UIAlertAction(title: &quot;Ok&quot;, style: .Cancel, handler: nil)
		
		alertController.addAction(cancel)
		return alertController
	}

Based on matt&#39;s answer, I changed the extension to a UIViewController extension, its much cleaner and saves lots of presentViewController code.

    	func showSimpleAlertWithMessage(message: String!) {
		
		let alertController = UIAlertController(title: nil, message: message, preferredStyle: UIAlertControllerStyle.Alert)
		let cancel = UIAlertAction(title: &quot;Ok&quot;, style: .Cancel, handler: nil)
		
		alertController.addAction(cancel)
		
		if self.presentedViewController == nil {
			self.presentViewController(alertController, animated: true, completion: nil)
		}
	}


What is the best way to check if a UIAlertController is already presenting?

I have tried several ways to use UIAlertController,instead of UIAlertView. I tried several ways but I cannot make the alert action work.
Here is my code that works fine in IOS 8 and IOS 9 but is showing up with deprecated flags.   I tried the elegant suggestion below but I can&#39;t make it function in this context.  I need to submit my app and this is the last thing to address.  Thank You for any further suggestions.  I am a newbie.
  
    #pragma mark - BUTTONS ================================
    - (IBAction)showModesAction:(id)sender {
    NSLog(@&quot;iapMade: %d&quot;, iapMade3);
    
    // IAP MADE ! ===========================================
    if (!iapMade3) {
        
        //start game here
        gamePlaysCount++;
        [[NSUserDefaults standardUserDefaults]setInteger:gamePlaysCount forKey:@&quot;gamePlaysCount&quot;];
        NSLog(@&quot;playsCount: %ld&quot;, (long)gamePlaysCount);

        if (gamePlaysCount &gt;= 4) {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@&quot;Basic&quot;
                                                         message: THREE_PLAYS_LIMIT_MESSAGE
                                                        delegate:self
                                               cancelButtonTitle:@&quot;Yes, please&quot;
                                               otherButtonTitles:@&quot;No, thanks&quot;, nil];
           [alert show];
            
            NSString *path = [[NSBundle mainBundle] pathForResource:@&quot;cow&quot; ofType:@&quot;wav&quot;];
            _pop =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
            [_pop play];
            [self dismissViewControllerAnimated:true completion:nil];
            
        } else {
            if (gamePlaysCount == 1)  {
                // Create &amp; store the next 5 mins when player gets 3 more lives
                nextDateToPlay = [[NSDate date] dateByAddingTimeInterval:60*60*0.1];
                NSLog(@&quot;CURRENT DATE: %@&quot;, [NSDate date]);
                NSLog(@&quot;NEXT DAY: %@&quot;, nextDateToPlay);
                [[NSUserDefaults standardUserDefaults]setObject: nextDateToPlay    forKey:@&quot;nextDateToPlay&quot;];
                NSLog(@&quot;nextDateToPlay: %@&quot;, nextDateToPlay);
       
                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@&quot;Basic&quot;
                                                               message:  THREE_PLAYS_LIMIT_MESSAGE2
                                                              delegate:self
                                                     cancelButtonTitle:@&quot;Got it!&quot;
                                                     otherButtonTitles:@&quot;Start&quot;, nil];
                [alert show];
            } else {
                
                if (gamePlaysCount == 3)  {
                    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@&quot;Basic&quot;
                                                                   message: THREE_PLAYS_LIMIT_MESSAGE3
                                                                  delegate:self
                                                         cancelButtonTitle:@&quot;Yep, I Know!&quot;
                                                         otherButtonTitles:@&quot;Start&quot;, nil];
                    [alert show];
                }
            }
        }
    }
    
    }

    // IAP NOT MADE =============================

    #pragma mark - ALERTVIEW DELEGATE ============================

    -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    
    if ([[alertView buttonTitleAtIndex:buttonIndex] isEqualToString:@&quot;Yes, please&quot;]) {
        
        UIStoryboard *storyboard = self.storyboard;
        MenuViewController *svc = [storyboard instantiateViewControllerWithIdentifier:@&quot;Store&quot;];
        svc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [self presentViewController:svc animated:YES completion:nil];

            }
    
    }


    

UIAlertView first deprecated IOS 9

I&#39;m presenting a `UIAlertView` to the user and I can&#39;t figure out how to write the handler. This is my attempt:

    let alert = UIAlertController(title: &quot;Title&quot;,
                                message: &quot;Message&quot;,
                         preferredStyle: UIAlertControllerStyle.Alert)

    alert.addAction(UIAlertAction(title: &quot;Okay&quot;,
                                  style: UIAlertActionStyle.Default,
                                handler: {self in println(&quot;Foo&quot;)})

I get a bunch of issues in Xcode.

The documentation says `convenience init(title title: String!, style style: UIAlertActionStyle, handler handler: ((UIAlertAction!) -&gt; Void)!)`

The whole blocks/closures is a little over my head at the moment. Any suggestion are much appreciated.

Writing handler for UIAlertAction

I am trying to show a `UIAlertController` with a `UITextView`. When I add the line:

        //Add text field
        alertController.addTextFieldWithConfigurationHandler { (textField) -&gt; Void in
        }        

I get a `Runtime` error: 

&gt; fatal error: unexpectedly found nil while unwrapping an Optional value

        
        let alertController: UIAlertController = UIAlertController(title: &quot;Find image&quot;, message: &quot;Search for image&quot;, preferredStyle: .Alert)
        
        //cancel button
        let cancelAction: UIAlertAction = UIAlertAction(title: &quot;Cancel&quot;, style: .Cancel) { action -&gt; Void in
            //cancel code
        }
        alertController.addAction(cancelAction)
        
        //Create an optional action
        let nextAction: UIAlertAction = UIAlertAction(title: &quot;Search&quot;, style: .Default) { action -&gt; Void in
            let text = (alertController.textFields?.first as! UITextField).text
            println(&quot;You entered \(text)&quot;)
        }
        alertController.addAction(nextAction)
        
        //Add text field
        alertController.addTextFieldWithConfigurationHandler { (textField) -&gt; Void in
            textField.textColor = UIColor.greenColor()
        }
        //Present the AlertController
        presentViewController(alertController, animated: true, completion: nil)

This is presented inside my `ViewController` via an `IBAction`.

I have downloaded the code from [here][1] and it works fine. I copied and pasted that method into my code and it breaks. The presence of **self** on the last line has no impact.


  [1]: http://sourcefreeze.com/uialertcontroller-ios-8-using-swift/

How to add TextField to UIAlertController in Swift

I have seen a couple screen shots of a UIAlertControllers with an image on the left of the row but I do not seen it in the documentation. An example visual is [![http://imgur.com/SISBvjB][1]][1]
Here is the code that I have for my controller right now:       

 

    UIAlertController * view =   [UIAlertController
                                     alertControllerWithTitle:@&quot;My Title&quot;
                                     message:@&quot;Select you Choice&quot;
                                     preferredStyle:UIAlertControllerStyleActionSheet];
        UIAlertAction* ok = [UIAlertAction
                             actionWithTitle:@&quot;OK&quot;
                             style:UIAlertActionStyleDefault
                             handler:^(UIAlertAction * action)
                             {
                              }];
        [view addAction:ok];
        [self presentViewController:view animated:YES completion:nil];


  [1]: https://i.stack.imgur.com/4H1Ad.png

Add Image to UIAlertAction in UIAlertController

How to dismiss `UIAlertController` when tap outside the `UIAlertController`? 

I can add a `UIAlertAction` of style `UIAlertActionStyleCancel` to dismiss the `UIAlertController`.

But I want to add the function that when user tap outside the `UIAlertController` the `UIAlertController` will dismiss. How to do that? Thank you.

How to dismiss UIAlertController when tap outside the UIAlertController?

UIAlertController with two buttons with styles set:

    UIAlertActionStyle.Cancel
    UIAlertActionStyle.Default

in iOS 8.2, the Cancel button is non-bold and Default is bold.
In iOS 8.3 they have switched round

You can see it Apple&#39;s own apps e.g., Settings &gt; Mail &gt; Add Account &gt; iCloud &gt; enter invalid data, then it shows like this on 8.3:

  Unsupported Apple ID

Learn More (bold)
OK (non-bold)


whereas it was the other way round for 8.2.

Any workaround to make it like 8.2 again. Why has it changed?

iOS UIAlertController bold button changed in 8.3

When using a `UIAlertController`, if I want to present a `UIActionSheet` with an empty title and an empty message, the frame for the expected placement of the title and/or message remains.

How do I change this so that I only present an `ActionSheet` that reads:
&lt;br&gt;
&lt;br&gt;
Settings
&lt;br&gt;
Sign out
&lt;br&gt;
Cancel
?

Thanks!

![UIAlertController example][1]


  [1]: http://i.stack.imgur.com/uebPY.png

How to hide title/message frame in a UIAlertController?

So I noticed that in iOS8 beta 3 (**Update**: still happens in iOS 11.2) on iPad, when attempting to present a view controller from within a delegate method of a `UIActionSheet`, &quot;nothing&quot; happens and a log message is output to the debug console, stating that presentation was attempted while transitioning an alert controller:

    Warning: Attempt to present &lt;UIViewController: 0x...&gt; on &lt;ViewController: 0x...&gt; which is already presenting &lt;UIAlertController: 0x...&gt;

Presenting a view controller modally from an action sheet&#39;s delegate in iOS8 - iOS11

I am using Swift to write an app and I need to show an alert. The app must be iOS 7 and iOS 8 compatible. Since `UIAlertView` has been replaced with `UIAlertController`, how can I check if the `UIAlertController` is available without checking the system version? I have been hearing that Apple recommends that we should not check the system version of the device in order to determine the availability of an API.

This is what I am using for iOS 8 but this crashes on iOS 7 with &quot;`dyld: Symbol not found: _OBJC_CLASS_$_UIAlertAction`&quot; :

    let alert = UIAlertController(title: &quot;Error&quot;, message: message, preferredStyle: .Alert)
    let cancelAction = UIAlertAction(title: &quot;OK&quot;, style: .Cancel, handler: nil)
    alert.addAction(cancelAction)
    presentViewController(alert, animated: true, completion: nil)

If I use the UIAlertView for iOS 8, I get this warning: `Warning: Attempt to dismiss from view controller &lt;_UIAlertShimPresentingViewController: 0x7bf72d60&gt; while a presentation or dismiss is in progress!`

UIAlertView/UIAlertController iOS 7 and iOS 8 compatibility

I want to realize a function about changing password. It requires users to input their previous password in an alert dialog.

I want to click the button &quot;Confirm the modification&quot; then jump to the other view controller for changing password. I have written some code, but I don&#39;t know how to write in the next moment.

```
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@&quot;Change password&quot; message:@&quot;Please input your previous password&quot; preferredStyle:UIAlertControllerStyleAlert];

[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
	textField.placeholder = @&quot;please input your previous password&quot;;
	textField.secureTextEntry = YES;
}];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@&quot;cancel&quot; style:UIAlertActionStyleCancel handlers:nil];

UIAlertAction *okAction = [UIAlertAction actionWithTitle:@&quot;Confirm the modification&quot; style:UIAlertActionStyleDestructive handler:*(UIAlertAction *alertAction) {
	if (condition) {
		statements
	}
}];

[alertController addAction:cancelAction];
[alertController addAction:okAction];
[self presentViewController:alertController animated:YES completion:nil];
```

[![enter image description here][2]][2]

  [1]: http://i.stack.imgur.com/LwpuY.png
  [2]: http://i.stack.imgur.com/C0IEe.png

How to add textField in UIAlertController?

I am adding a `UITextField` to a `UIAlertController`, which appears as an `AlertView`. Before dismissing the `UIAlertController`, I want to validate the input of the `UITextField`. Based on the validation I want to dismiss the `UIAlertController` or not. But I have no clue how to prevent the dismissing action of the `UIAlertController` when a button is pressed. Has anyone solved this problem or any ideas where to start ? I went to google but no luck :/ Thanks! 

Prevent dismissal of UIAlertController

I am maintaining an old iOS project which based on SDK 6.0.

A method on this project called 

`-(void) showComboBox:(UIView*)view:withOptions:(NSDictionary*)options`

is used to show a combo box. To achieve the goal, it used UIActionSheet, which is deprecated on iOS8. 

My solution is like this:

            if (floor(NSFoundationVersionNumber) &gt; NSFoundationVersionNumber10_8) {
            UIAlertController* alertController = [UIAlertController 
               alertControllerWithTitle:@&quot;title&quot; 
               message:@&quot;message&quot; 
               preferredStyle:UIAlertControllerStyleActionSheet];
            
            UIAlertAction* item = [UIAlertAction actionWithTitle:@&quot;item&quot; 
               style:UIAlertActionStyleDefault 
               handler:^(UIAlertAction *action) {
                //do something here 
                //inform the selection to the WebView 
                ...
                [alertController dismissViewControllerAnimated:YES completion:nil];
            }];
            
            UIAlertAction* cancelAction = [UIAlertAction actionWithTitle:@&quot;Cancel&quot; style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
                [alertController dismissViewControllerAnimated:YES completion:nil];
            }];
            
            [alertController addAction:item];
            [alertController addAction:cancelAction];
            //I am not sure whether it&#39;s the right way
            if ([view.nextResponder isKindOfClass:UIViewController.class]) {
                UIViewController* vc = (UIViewController*)view.nextResponder;
                [vc presentViewController:alertController animated:YES completion:nil];
            }

Is that a proper solution?

This is what I mostly **concern about**: UIAlertController needs to be added to a UIViewController but I can only get the pointer of the UIView, so I used view.nextResponder to get what I want, but it&#39;s that a good way? 
           


How to use UIAlertController to replace UIActionSheet?

I&#39;m trying to make the actionsheet as it shows in the messages app on iOS when we try to attach an image as in the screenshot.

I realized in new UIAlertController, we can&#39;t fit any custom views. Any way I can make exactly this?

My code looks pretty standard.

        let alertController = UIAlertController(title: &quot;My AlertController&quot;, message: &quot;tryna show some images here man&quot;, preferredStyle: UIAlertControllerStyle.ActionSheet)
        
            let okAction = UIAlertAction(title: &quot;oks&quot;, style: .Default) { (action: UIAlertAction) -&gt; Void in
            alertController.dismissViewControllerAnimated(true, completion: nil)
        }
        let cancelAction = UIAlertAction(title: &quot;Screw it!&quot;, style: .Cancel) { (action: UIAlertAction) -&gt; Void in
            alertController.dismissViewControllerAnimated(true, completion: nil)
        }
        
        alertController.addAction(okAction)
        alertController.addAction(cancelAction)
        
        self.presentViewController(alertController, animated: true, completion: nil)


[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/kGBzB.jpg

UIAlertController - add custom views to actionsheet

When writing the `handler` closure of a `UIAlertAction`, should the reference to `self` be strong (the default), `weak`, or `unowned`?

There have been posts relevant to this topic ([1](https://stackoverflow.com/questions/24320347/shall-we-always-use-unowned-self-inside-closure-in-swift), [2](https://stackoverflow.com/questions/25975073/swift-closures-capturing-self-as-weak), [3](https://stackoverflow.com/questions/24042949/block-retain-cycles-in-swift), [4](https://stackoverflow.com/questions/32936264/why-specify-unowned-self-in-blocks-where-you-depend-on-self-being-there)) but I honestly don&#39;t see how they help in this case.




Let&#39;s focus on this typical code:

    func tappedQuitButton() {
        let alert = UIAlertController(title: &quot;Confirm quit&quot;, message: nil, preferredStyle: .ActionSheet)

        let quitAction = UIAlertAction(title: &quot;Quit&quot;, style: .Default) { (action) in
            self.dismissViewControllerAnimated(true, completion: nil)
        }
        alert.addAction(quitAction)

        let cancelAction = UIAlertAction(title: &quot;Cancel&quot;, style: .Default) { (action) in
            self.dismissViewControllerAnimated(true, completion: nil)
        }
        alert.addAction(cancelAction)

        presentViewController(alert, animated: true, completion: nil)
    }

This is a function inside a `UIViewController` subclass, so `self` is the view controller presenting the alert.

The [documentation](https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AutomaticReferenceCounting.html) says: 

&gt;Use a weak reference to avoid reference cycles whenever it is possible for that reference to have “no value” at some point in its life. If the reference will always have a value, use an unowned reference instead. 

I may be blind, but I still don&#39;t see how this helps answering my question about `UIAlertAction`. 

In the above code, is it possible for `self` to be nil _at some point in its life_? Yes. So I should mark `self` as `weak`.

But then again, I can&#39;t think of a plausible scenario where `self` will be nil when the closure is called. So as far as that closure is concerned, `self` _will always have a value_. So I should mark `self` as `unowned`. 

So, again, how should `self` be captured in a UIAlertAction&#39;s handler?

Should self be captured as strong in a UIAlertAction&#39;s handler?

I want to add text input in alert-view of ios 8.
I know it was done using `UIAlertController` but not have any idea.
How to do it ? 

All Uialertcontroller Solutions on Gang of Coders

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