Uialertview Is Not Working in Swift

UIAlertView is Not Working in Swift

From Xcode 6.0 UIAlertView class:

UIAlertView is deprecated. Use UIAlertController with a preferredStyle
of UIAlertControllerStyleAlert instead.

On swift ( iOS 8 and OS X 10.10 ), you can do this:

var alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Cancel, handler:handleCancel))
        alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:{ (ACTION :UIAlertAction!)in
                println("User click Ok button")
            }))
        self.presentViewController(alert, animated: true, completion: nil)

func handleCancel(alertView: UIAlertAction!)
        {
            println("User click cancel button")
        }

If you want to use in 'ActionSheet' instead 'Alert' you need only to change the UIAlertControllerStyle for example:

var alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.ActionSheet)

UIAlertController won't display - In Swift

The problem is that by the time you call this following function:

present(alertController, animated: true, completion: nil)

your mail view controller is still visible. You have to make sure that the alertController is presented on the top of window hierarchy. In your example, you have the following window hierarchy:

+---------------------------+
| MailComposeViewController |
+---------------------------+
            ||
+---------------------------+
|  ContactUsViewController  |
+---------------------------+

What you should do instead is to dismiss the email view controller first. When that is done, show you alert view controller.

let alertController = UIAlertController(title: "test", message: "test", preferredStyle: .Alert)
let okButton = UIAlertAction(title: "Okay", style: .Default, handler: nil)
alertController.addAction(okButton)
controller.dismissViewControllerAnimated(true){ () -> Void in
     self.present(alertController, animated: true, completion: nil)   
}

Alternatively, you can also present your alertController on top of the MailComposeViewController, like so:

let alertController = UIAlertController(title: "test", message: "test", preferredStyle: .Alert)
let okButton = UIAlertAction(title: "Okay", style: .Default, handler: nil)
alertController.addAction(okButton)
controller.present(alertController, animated: true, completion: nil)

How would I create a UIAlertView in Swift?

From the UIAlertView class:

// UIAlertView is deprecated. Use UIAlertController with a
preferredStyle of UIAlertControllerStyleAlert instead

On iOS 8, you can do this:

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

Now UIAlertController is a single class for creating and interacting with what we knew as UIAlertViews and UIActionSheets on iOS 8.

Edit: To handle actions:

alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action in
    switch action.style{
    case .Default:
        print("default")
        
    case .Cancel:
        print("cancel")
        
    case .Destructive:
        print("destructive")
    }
}}))

Edit for Swift 3:

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)

Edit for Swift 4.x:

let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
    switch action.style{
        case .default:
        print("default")
        
        case .cancel:
        print("cancel")
        
        case .destructive:
        print("destructive")
        
    }
}))
self.present(alert, animated: true, completion: nil)

UIAlertView not appearing

Make loginAlert a class variable. presentViewController does not keep a reference to the alertController. Because it is in a local variable now, it will be deleted at the end of viewDidAppear.

How to show an alert in Swift UIAlertView not working

You should use UIAlertController

UIAlertView is deprecated.

You can show an alert with this code:

var alert = UIAlertController(title: "Alert", message: "test", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

UIAlertView delay or not showing

Try with this

[[NSOperationQueue mainQueue] addOperationWithBlock:^{
        alert = [[UIAlertView alloc]initWithTitle:@""
                                  message:[NSString stringWithFormat: @"Reload data ?"]
                                 delegate:self
                        cancelButtonTitle:@"Yes"
                        otherButtonTitles:@"Cancel", nil];    
       [alert show];
       NSLog(@"executed");
    }];

UIAlert view doesnt show up in Swift ?

It will not show up in viewDidLoad(). You call the function from viewDidAppear()

Problems with getting text from UIAlertView textfield

You may go with UIAlertController instead of UIAlertView.

I've already implemented and tested too using UIAlertController for what you actually want. Please try the following code

    var tField: UITextField!

    func configurationTextField(textField: UITextField!)
    {
        print("generating the TextField")
        textField.placeholder = "Enter an item"
        tField = textField
    }

    func handleCancel(alertView: UIAlertAction!)
    {
        print("Cancelled !!")
    }

    var alert = UIAlertController(title: "Enter Input", message: "", preferredStyle: .Alert)

    alert.addTextFieldWithConfigurationHandler(configurationTextField)
    alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler:handleCancel))
    alert.addAction(UIAlertAction(title: "Done", style: .Default, handler:{ (UIAlertAction) in
        print("Done !!")

        print("Item : \(self.tField.text)")
    }))
    self.presentViewController(alert, animated: true, completion: {
        print("completion block")
    })

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