Скачать или смотреть Designing an Effective Passcode Screen for Swift Authentication

Learn how to create a user-friendly passcode authentication screen in Swift that securely stores user passcodes and simplifies login processes.
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This video is based on the question https://stackoverflow.com/q/67058751/ asked by the user 'miki' ( https://stackoverflow.com/u/12403893/ ) and on the answer https://stackoverflow.com/a/67059045/ provided by the user 'Savvy' ( https://stackoverflow.com/u/14104020/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Designing an Effective Passcode Screen for Swift Authentication

Creating a secure and user-friendly authentication process is vital for any application, especially when dealing with sensitive user data. In this post, we will tackle the design of a passcode screen for your iOS app using Swift. This screen not only allows users to create and confirm their passcodes but also ensures a seamless experience in subsequent app launches.

The Problem

When a user launches your app for the first time, they should be welcomed with a passcode screen. The goal is to enable them to create a unique passcode, confirm it, and use it for all future logins. The specific flow we want to achieve is:

User opens the app for the first time.

User is prompted to create a passcode.

The app requests the user to re-enter the passcode for confirmation.

If the entered passcodes match, the app stores the passcode securely for future logins.

On subsequent app launches, the user is asked to enter the passcode to access the app.

However, the challenge arises in managing this flow smoothly and storing the passcode effectively while ensuring the user does not feel like they are stuck in a cycle of screens.

The Solution

To create a seamless user experience, we will focus on managing the passcode process within the same view rather than creating multiple screens. Below, I’ll break down the steps to implement this logic effectively.

Step 1: Create the UI

First, design a user interface that includes:

A UITextField for the user to input their passcode.

A way to display instructions or feedback to the user.

Optionally, buttons for confirming the entered passcode and for cancelling the operation.

Step 2: Manage Passcode State

Use a variable within your ViewController or ViewModel to store the initial passcode input securely.

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Step 3: Handle User Input

When the user enters their passcode, check if this is their first time:

First Time Launch:

Save the passcode in storedPasscode.

Clear the UITextField to prompt for confirmation.

Update the user with instructions to re-enter their passcode.

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Confirmation:

Once the user re-enters the passcode, check it against storedPasscode.

If they match, save the passcode securely using UserDefaults or Keychain for persistence.

Step 4: Login on Subsequent Launches

On subsequent app launches:

If the passcode has been set, prompt the user to enter it.

Validate the entered passcode against the saved value.

Allow or deny access based on the validation.

Example Code Snippet

Here's a simplified example to illustrate how you might implement these steps:

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Conclusion

Designing a passcode screen in Swift doesn’t have to be complicated. By simply managing the state within the same screen, you can create a smooth user experience that effectively guides users from setting a passcode to using it for app access. Remember, user experience is critical, and ensuring minimal friction during the authentication process will enhance user satisfaction with your application.

By following these steps, you'll be well on your way to implementing a secure and user-friendly authentication passcode process in your Swift app!