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UIAlertController is now the class that should be used for displaying alerts in iOS 8

Starting with iOS 8, UIAlertController has completely replaced UIActionSheet and UIAlertView, both of which are now deprecated.

Unlike the classes it replaced, which are subclasses of UIView, UIAlertController is a subclass of UIViewController.

Use UIAlertControllerStyle to indicate the type of alert to display. These alerts types are:

  • UIAlertControllerStyleActionSheet
    • pre iOS 8 this would have been a UIActionSheet
  • UIAlertControllerStyleAlert
    • Pre iOS 8 this would have been UIAlertView

There are three steps to take when creating an AlertController:

  • Create and configure the Alert

    • title
    • message
    • preferredStyle
  • (Optional) Add a text field

  • Add the Required actions
  • Present the View Controller

Alert with One Button


okayButton.TouchUpInside += (sender, e) => {

                //Create Alert
                var okAlertController = UIAlertController.Create ("OK Alert", "This is a sample alert with an OK button.", UIAlertControllerStyle.Alert);

                //Add Action
                okAlertController.AddAction (UIAlertAction.Create ("Ok", UIAlertActionStyle.Default, null));

                // Present Alert
                PresentViewController (okAlertController, true, null);

Alert with Two buttons


okayCancelButton.TouchUpInside += ((sender, e) => {

                //Create Alert
                var okCancelAlertController = UIAlertController.Create("OK / Cancel Alert", "This is a sample alert with an OK / Cancel Button", UIAlertControllerStyle.Alert);

                //Add Actions
                okCancelAlertController.AddAction(UIAlertAction.Create("Okay", UIAlertActionStyle.Default, alert => Console.WriteLine ("Okay was clicked")));
                okCancelAlertController.AddAction(UIAlertAction.Create("Cancel", UIAlertActionStyle.Cancel, alert => Console.WriteLine ("Cancel was clicked")));

                //Present Alert
                PresentViewController(okCancelAlertController, true, null);

Alert with Text Field


textInputButton.TouchUpInside += ((sender, e) => {

                //Create Alert
                var textInputAlertController = UIAlertController.Create("Text Input Alert", "Hey, input some text", UIAlertControllerStyle.Alert);

                //Add Text Input
                textInputAlertController.AddTextField(textField => {

                //Add Actions
                var cancelAction = UIAlertAction.Create ("Cancel", UIAlertActionStyle.Cancel, alertAction => Console.WriteLine ("Cancel was Pressed"));
                var okayAction = UIAlertAction.Create ("Okay", UIAlertActionStyle.Default, alertAction => Console.WriteLine ("The user entered '{0}'", textInputAlertController.TextFields[0].Text));


                //Present Alert
                PresentViewController(textInputAlertController, true, null);

ActionSheet Alert


actionSheetButton.TouchUpInside += ((sender, e) => {

                // Create a new Alert Controller
                UIAlertController actionSheetAlert = UIAlertController.Create("Action Sheet", "Select an item from below", UIAlertControllerStyle.ActionSheet);

                // Add Actions
                actionSheetAlert.AddAction(UIAlertAction.Create("Item One",UIAlertActionStyle.Default, (action) => Console.WriteLine ("Item One pressed.")));

                actionSheetAlert.AddAction(UIAlertAction.Create("Item Two",UIAlertActionStyle.Default, (action) => Console.WriteLine ("Item Two pressed.")));

                actionSheetAlert.AddAction(UIAlertAction.Create("Item Three",UIAlertActionStyle.Default, (action) => Console.WriteLine ("Item Three pressed.")));

                actionSheetAlert.AddAction(UIAlertAction.Create("Cancel",UIAlertActionStyle.Cancel, (action) => Console.WriteLine ("Cancel button pressed.")));

                // Required for iPad - You must specify a source for the Action Sheet since it is
                // displayed as a popover
                UIPopoverPresentationController presentationPopover = actionSheetAlert.PopoverPresentationController;
                if (presentationPopover!=null) {
                    presentationPopover.SourceView = this.View;
                    presentationPopover.PermittedArrowDirections = UIPopoverArrowDirection.Up;

                // Display the alert

Xamarin Workbook

If it's not already installed, install the Xamarin Workbooks app first. The workbook file should download automatically, but if it doesn't, just click to start the workbook download manually.