ionic back button exit app with code examples

Ionic is a popular open-source framework for building hybrid mobile applications. It is built on top of Apache Cordova and provides a rich set of UI components, services, and tools for creating feature-rich mobile apps for different platforms like iOS, Android, and web. One of the important components of Ionic is the back button. In this article, we will discuss how to implement the Ionic back button to exit an app with code examples.

What is Ionic Back Button?

Ionic Back Button is a UI component that provides a visual cue to the user that they can go back to the previous page or state of the application. It is used to navigate between views and states of the application. The back button is an important component of almost all mobile applications, especially those that have multiple screens or pages.

When the user presses the back button, it takes them back to the previous page or state. However, if the back button is pressed on the first page or state of the application, it should exit the app. This feature of the back button is important as it makes the user experience smoother and more intuitive.

Implementing Ionic Back Button to Exit App

To implement the Ionic back button to exit the app, we need to add a listener to the back button event and detect when the user is on the first page or state of the application. If the user is on the first page or state, then we can exit the application by calling the exitApp() method.

To add a listener to the back button event in Ionic, we need to import the Platform module from the @ionic/angular package and inject it into the constructor of the component where we want to implement the back button exit functionality. Once we have injected the Platform module, we can add a listener to the backButton event using the registerBackButtonAction() method.

Let's see the code implementation of the Ionic back button exit app:

import { Component } from '@angular/core';
import { Platform } from '@ionic/angular';
import { AlertController } from '@ionic/angular';

@Component({
selector: 'app-home',
templateUrl: 'home.page.html',
styleUrls: ['home.page.scss'],
})
export class HomePage {

backButtonSubscription: any;

constructor(
    public platform: Platform,
    public alertController: AlertController
) {}

ionViewDidEnter() {
    this.backButtonSubscription = this.platform.backButton.subscribe(() => {
        if (window.location.pathname === '/home') { // Replace '/home' with your first page path or route
            this.confirmExitApp();
        }
    });
}

ionViewWillLeave() {
    this.backButtonSubscription.unsubscribe();
}

async confirmExitApp() {
    const alert = await this.alertController.create({
        header: 'Confirmation',
        message: 'Are you sure you want to exit the app?',
        buttons: [
            {
                text: 'Cancel',
                role: 'cancel',
                handler: () => {
                    console.log('Cancel clicked');
                }
            },
            {
                text: 'Exit',
                handler: () => {
                    navigator['app'].exitApp(); // Call the exitApp() method
                }
            }
        ]
    });
    await alert.present();
}

}

In the above code, we have imported the Platform and AlertController modules from @ionic/angular and injected them into the constructor. We have also created two lifecycle hooks, ionViewDidEnter() and ionViewWillLeave(). In the ionViewDidEnter() hook, we have subscribed to the backButton event and checked if the user is on the first page or state of the application. If the user is on the first page or state, then we show a confirmation dialog by calling the confirmExitApp() method. In the ionViewWillLeave() hook, we have unsubscribed from the backButton event to avoid any memory leaks.

In the confirmExitApp() method, we have shown an Alert dialog with two buttons, Cancel and Exit. If the user clicks the Exit button, then we call the exitApp() method from the navigator object to exit the application.

Conclusion

In this article, we have discussed the importance of the Ionic back button and how to implement it to exit an app with code examples. Adding the back button exit functionality to your Ionic app can improve the user experience and make it more intuitive. With the help of the Platform module and the exitApp() method, you can easily implement the back button exit functionality in your Ionic app.

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Popular questions

  1. What is the purpose of Ionic Back Button in mobile applications?
    Answer: The purpose of the Ionic Back Button is to provide a visual cue to the user that they can go back to the previous page or state of the application. It is used to navigate between views and states of the application.

  2. How can we implement the Ionic Back Button to exit an application?
    Answer: To implement the Ionic Back Button to exit the app, we need to add a listener to the back button event and detect when the user is on the first page or state of the application. If the user is on the first page or state, then we can exit the application by calling the exitApp() method.

  3. Which module needs to be imported to add a listener to the back button event in Ionic?
    Answer: The Platform module needs to be imported from the @ionic/angular package to add a listener to the back button event in Ionic.

  4. How can we unsubscribe from the backButton event in Ionic?
    Answer: We can unsubscribe from the backButton event in Ionic by calling the unsubscribe() method on the backButtonSubscription object.

  5. What is the purpose of the confirmExitApp() method in the Ionic Back Button exit implementation?
    Answer: The confirmExitApp() method is used to show a confirmation dialog to the user asking whether they want to exit the app or not. If the user clicks on the "Exit" button, then the app will be exited, otherwise, they can choose to cancel and stay in the app.

Tag

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