You may want to give a warning or additional messages with alerts that let users know their misbehavior in the application. These alerts can be presented using UIAlerts a pop-up that comes in the ios applications. You can also display messages in alert views. In addition to messages, you can link activities to your alert to provide a way for the user to react.
Let's create a small app that displays an alert when a button is tapped.
Step 1: Create a new Xcode Project
Navigate to Xcode Application -> Select create a new Xcode project ->Select iOS on the top, then select single view app and click on next-> Give a Name to your application -> Provide the path to save the application and then click on create
Step 2: Add Button
Navigate to main.storyboard press ( command + shift + L ) select button and drag it to the View Controller.
Right-click on the button and press control and drag it to viewcontroller.swift select action and click on connect.
Step 3: Initiate Alert
Write UIAlertController() function in @IBAction func ButtonTapped
UIAlertController() function invokes alert view when the button is tapped you can provide an alert title, message in the arguments which will be displayed in the alert.
In addition, you can also provide actions that can be performed using addAction() function.
Please check the following link for the full code.