Скачать или смотреть How to Show an Alert in SwiftUI When Using Async and Await for User Login

Learn how to implement alert functionality in SwiftUI during an asynchronous login process, ensuring users receive feedback for incorrect credentials.
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This video is based on the question https://stackoverflow.com/q/77358778/ asked by the user 'Nus' ( https://stackoverflow.com/u/21666271/ ) and on the answer https://stackoverflow.com/a/77358849/ provided by the user 'Shehata Gamal' ( https://stackoverflow.com/u/5820010/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling User Login with Async, Await, and Alerts in SwiftUI

When developing apps, providing feedback to users is crucial, especially during the login process. A common requirement is to show an alert message when the user enters incorrect credentials. However, implementing this feature can sometimes lead to confusion, especially when working with async and await functions in Swift. In this guide, we'll explore how to effectively display an alert in SwiftUI when a user clicks the sign-in button and enters incorrect username or password information.

The Problem: Alerts Not Displaying

Imagine you have a login form where a user can enter their username and password. When the credentials are incorrect, you want an alert to pop up, informing the user about the mistake. Many developers face an issue where the alert fails to show up upon incorrect login attempts, primarily due to incorrect implementation in the button action or alert triggering logic.

Example Code Setup

Below is a simplified version of the setup. You have a SwiftUI view that contains input fields for username and password, with a button to trigger the sign-in process:

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The Solution: Correcting the Alert Implementation

To address the issue where the alert is not shown properly, it’s important to ensure two main aspects are correctly implemented: how you manage the alert presentation and how you handle button actions.

1. Update Alert Presentation Logic

The alert should be attached properly to the end of the VStack. This is done using the .alert(isPresented:) modifier at the end of your views, like so:

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This change ensures that the alert is connected to the state of isErrorOccured properly.

2. Simplify the Button Action Logic

You can simplify the logic within the button action. The original concept where you checked if an alert should show is unnecessary. Instead, handle the asynchronous login directly. Below is an example of how you would manage this in your code:

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This method ensures that any errors caught during the login attempt will automatically trigger the alert to show.

Conclusion

Implementing alert functionality in SwiftUI during an asynchronous process should be straightforward but requires careful structure and logic in your code. By attaching the alert appropriately and managing the button logic efficiently, you can enhance user experience by providing immediate feedback on login attempts. Now your app can gracefully inform users about login issues, improving overall usability.

By following the suggestions outlined above, you should now be able to show alerts effectively when the button is clicked, ensuring that users are always aware of the status of their sign-in attempts.