#uialertcontroller

UIAlertController Refactor | Xcode 11 | Swift 5.2

Hi Buddy,

In this swift tutorial I discuss the topic of refactoring of UIAlertController code out of your UIViewController. This will make your code much more readable, and keep those UIViewController small.

You can use this UIAlertController for any other ViewController.

That makes sense to users what was going on right now in this UI Element.

Once you implemented it will help for…

original source : https://medium.com/swift-india/uialertcontroller-in-swift-22f3c5b1dd68

my review point : 9

alert controller 사용 방법에 대해 간단 명료하게 설명

UIAlertController is one of the most basic component of the app development, because using the UIAlertController to get the feedback, confirmation, choose between the options from the user, also we do alerts.

Components

Title : The title of the alert.

Alert Message : Descriptive text that provides more details about the reason for the alert.

Alert Style : Indicating the type of alert to display.

Alert Actions : The actions that the user can take in response to the alert or action sheet.

Alert TextField : Text field displayed by the alert.

Alert Styles: Alert Or Action Sheet?

When creating your alert controller, you can choose between two options from enum UIAlertControllerStyle

.alert : An alert displayed modally for the app.

.actionSheet : An action sheet displayed in the context of the view controller that presented it.

Ready? Let’s go, 👨‍💻

Simple alert

   /**     Simple Alert     - Show alert with title and alert message and basic two actions    */    func showSimpleAlert() {        let alert = UIAlertController(title: "Sign out?", message: "You can always access your content by signing back in",         preferredStyle: UIAlertControllerStyle.alert)        alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: { _ in            //Cancel Action        }))        alert.addAction(UIAlertAction(title: "Sign out",                                      style: UIAlertActionStyle.default,                                      handler: {(_: UIAlertAction!) in                                        //Sign out action        }))        self.present(alert, animated: true, completion: nil)    }

Simple action sheet

   /**     Simple Action Sheet     - Show action sheet with title and alert message and actions     */    func showSimpleActionSheet(controller: UIViewController) {        let alert = UIAlertController(title: "Title", message: "Please Select an Option", preferredStyle: .actionSheet)        alert.addAction(UIAlertAction(title: "Approve", style: .default, handler: { (_) in            print("User click Approve button")        }))        alert.addAction(UIAlertAction(title: "Edit", style: .default, handler: { (_) in            print("User click Edit button")        }))        alert.addAction(UIAlertAction(title: "Delete", style: .destructive, handler: { (_) in            print("User click Delete button")        }))        alert.addAction(UIAlertAction(title: "Dismiss", style: .cancel, handler: { (_) in            print("User click Dismiss button")        }))        self.present(alert, animated: true, completion: {            print("completion block")        })    }

Alert with distractive button

   /**     Simple Alert with Distructive button     */    func showAlertWithDistructiveButton() {        let alert = UIAlertController(title: "Sign out?", message: "You can always access your content by signing back in", preferredStyle: UIAlertControllerStyle.alert)        alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: { _ in            //Cancel Action        }))        alert.addAction(UIAlertAction(title: "Sign out",                                      style: UIAlertActionStyle.destructive,                                      handler: {(_: UIAlertAction!) in                                        //Sign out action        }))        self.present(alert, animated: true, completion: nil)    }

Alert with more than 2 buttons

   /**     Simple Alert with more than 2 buttons     */    func showAlertWithThreeButton() {        let alert = UIAlertController(title: "Alert", message: "Alert with more than 2 buttons", preferredStyle: .alert)        alert.addAction(UIAlertAction(title: "Default", style: .default, handler: { (_) in            print("You've pressed default")        }))        alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (_) in            print("You've pressed cancel")        }))        alert.addAction(UIAlertAction(title: "Destructive", style: .destructive, handler: { (_) in            print("You've pressed the destructive")        }))        self.present(alert, animated: true, completion: nil)    }

Alert with UITextField

   /**     Simple Alert with Text input     */    func showAlertWithTextField() {        let alertController = UIAlertController(title: "Add new tag", message: nil, preferredStyle: .alert)        let confirmAction = UIAlertAction(title: "Add", style: .default) { (_) in            if let txtField = alertController.textFields?.first, let text = txtField.text {                // operations                print("Text==>" + text)            }        }        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (_) in }        alertController.addTextField { (textField) in            textField.placeholder = "Tag"        }        alertController.addAction(confirmAction)        alertController.addAction(cancelAction)        self.present(alertController, animated: true, completion: nil)    }

If you want to validate the input box, add delegate to the UITextField and you can validate as normally we do for others.

iBlahji/Example-UIAlertController Example-UIAlertController - UIAlertController in swiftgithub.com

Sometimes you might wanna change the alert controller’s text alignment, let say, from center to right. Then following tip is for you.

Just simply open a playground and run these code

import UIKit import XCPlayground let alertView = UIAlertController(title: "Demo Alert", message: "", preferredStyle: .alert) alertView.addAction(UIAlertAction(title: "OK", style: .default, handler: nil)) let…

UIAlertController: Alert and Action Sheet in iOS

In this tutorial, I will show you the new way to display an alert message to the user and associate user actions with that alert message in your iOS app.

UIAlertView and UIActionSheet, introduced in iOS 2, were deprecated in iOS 8. And now, starting from iOS 8, they have both been replaced by UIAlertController. But for apps that target prior versions of iOS 8, you should still use the UIAlertView class to display an alert message to the user and the UIActionSheet class to present the user with a set of alternatives for how to proceed with a given task. Action sheets are also used to prompt the user to confirm a potentially dangerous action (for example, to request the user to confirm to delete a file). If you need to show alerts in apps before iOS 8, you should read our iPhone user alerts post. We have recently updated this post by adding Objective-C and Swift side by side.