How to create different types of alerts and actionsheets in iOS swift

How to create different types of alerts and actionsheets in iOS:

To show an alert in iOS, we have UIAlertController class. It is used to create one basic Alert in iOS. It uses iOS system layout theme and doesn’t provide a lot of customization. We will learn how to show an alert in iOS, how to add actions, and how to change its styles.

How to create a basic alert:

For this post, I am creating one UIViewController with one Button in the middle:

Here is the ViewController :

import UIKit

class ViewController: UIViewController {

    @IBAction func onTapButton(_ sender: Any) {
        let alertController = UIAlertController(title: "Hello", message: "Welcome to our Blog !!", preferredStyle: .alert)
        self.present(alertController, animated: true, completion: nil)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

onTapButton is called if we click on the button.

Here, we are creating one instance of UIAlertController and presenting it. Below is the output:

Note that it will not dismiss the alert if we click on its side.

ActionSheet:

We can give preferredStyle: .actionSheet for an alert. It will open one action sheet from bottom.

Adding actions to the Alert:

We can add actions, called UIAlertAction to the Alert. Actions are buttons that are added to the bottom of an Alert. For example :

import UIKit

class ViewController: UIViewController {

    @IBAction func onTapButton(_ sender: Any) {
        let alertController = UIAlertController(title: "Hello", message: "Welcome to our Blog !!", preferredStyle: .alert)
        
        let okAction = UIAlertAction(title: "OK", style: .default, handler: {(action) -> Void in
            print("ok tapped")
        })
        let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: {(action) -> Void in
            print("Cancel tapped")
        })
        let dismissAction = UIAlertAction(title: "Dismiss", style: .destructive, handler: {(action) -> Void in
            print("Dismiss tapped")
        })
        
        
        alertController.addAction(okAction)
        alertController.addAction(cancelAction)
        alertController.addAction(dismissAction)
        
        self.present(alertController, animated: true, completion: nil)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

We have added three actions here with different styles. For each action, we can have one handler.

It will give the below output:

For an actionSheet, it will look as like below:

Adding a text field:

UIAlertController provides a way to add one text field to it:

alertController.addTextField(configurationHandler: {textField in
            textField.placeholder = "Enter your message"
})

We can add more than one Text Field to an Alert. alertController.textFields gives the reference to these text fields.

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