How to Jump to a Specific ViewController in Xcode When Reopening an App

Описание: Learn how to seamlessly navigate users to a specific ViewController in Xcode using Swift and UserDefaults. This guide breaks down the process into easy steps.
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This video is based on the question https://stackoverflow.com/q/64342629/ asked by the user 'david andersson' ( https://stackoverflow.com/u/14189003/ ) and on the answer https://stackoverflow.com/a/64342768/ provided by the user 'cristian_064' ( https://stackoverflow.com/u/8409209/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Jump to a Specific ViewController in Xcode When Reopening an App

When developing iOS applications, a common question arises: How do I make my users return to a specific view controller when they reopen the app? This functionality can significantly enhance user experience, making it feel more intuitive and responsive to their last activity. In this guide, we will explore a straightforward solution using Swift and UserDefaults to achieve this behavior.

Understanding the Problem

In a typical app with multiple view controllers, users might navigate through several screens. If they exit the app and return later, they may expect to see the last view they were using. However, by default, the app might not retain their navigation state, leading them back to the initial view controller every time. This behavior can be frustrating, especially if users were engaged in a task.

Solution Overview

To redirect users to a specific view controller upon reopening the app, we will use the following steps:

Save the current view controller’s state using UserDefaults before the app is closed.

Modify the app's delegate to read from UserDefaults and determine which view controller should be displayed when the app is launched.

Step 1: Saving User State with UserDefaults

Before the user closes the app, we need to save their current position (i.e., which view controller they were last using). You can do this by setting a variable in UserDefaults in each view controller when the app transitions away from it.

Here's how to save the name of the view controller:

[[See Video to Reveal this Text or Code Snippet]]

You would place this code in the viewWillDisappear or viewDidDisappear method of your view controllers.

Step 2: Modifying Scene Delegate

Now, we need to read this information when the app launches, and decide which view controller to display. You will typically do this inside your SceneDelegate.

Here’s a concise implementation:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Init Window: We create a main window for the application and ensure it is visible.

Get Last View Controller ID: We retrieve the saved identifier from UserDefaults.

Conditional Logic: Based on the saved identifier, we can instantiate the desired view controller and set it as the root view controller. If no specific identifier exists, we default back to an initial view controller.

Conclusion

By implementing these two simple steps, you can greatly improve the user experience of your application by facilitating a smooth transition back to the last used screen. Using UserDefaults allows for an easy yet effective way to manage user state, making your app not only user-friendly but more intelligent in its handling of user sessions.

Ensure to test this functionality thoroughly, to guarantee that the transitions and saved states work as expected across different scenarios. Happy coding!