Скачать или смотреть Resolving the Initial View Controller Loading Issue After iOS App Suspension

Discover how to fix the issue where your iOS app's `Initial View Controller` does not load properly after suspension. Learn step-by-step solutions and tips for better background activity management.
---
This video is based on the question https://stackoverflow.com/q/63738644/ asked by the user 'Alex' ( https://stackoverflow.com/u/13338050/ ) and on the answer https://stackoverflow.com/a/63801121/ provided by the user 'Alex' ( https://stackoverflow.com/u/13338050/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: After my app is suspended by the system, the Initial View Controller does not load properly

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the Problem: Why is the Initial View Controller Failing to Load?

If you are a developer working with iOS apps using Swift and Xcode, you may encounter a peculiar issue: your app's Initial View Controller does not load correctly after the app has been suspended while in the background. This problem can be quite baffling, especially when the app functions perfectly in other situations.

In this article, we will unpack the causes of this problem and outline practical solutions that can help ensure your app behaves as expected, even after being suspended by the system.

Identifying the Symptoms

When this issue occurs, you’ll typically notice the following behavior:

The storyboard scene defined as the Initial View Controller is displayed.

However, the crucial viewDidLoad() function of its associated view controller does not execute.

This problem only arises after the app has been suspended by iOS, not when it is manually terminated and relaunched from scratch.

Delving into the Root Cause

After an extensive debugging process, several developers have pinpointed that this issue arises due to background activities within the app. In some cases, apps receive silent push notifications while in the background, which can trigger background tasks such as network calls to refresh local data. While this may seem innocuous, it can lead to unintended consequences.

Here's a breakdown of the underlying factors that may be causing your Initial View Controller to not load properly:

Background Activity: Background activities can sometimes instantiate UI components, which can lead to improper handling if there are unresolved dependencies.

Network Calls: If your UI relies on additional network calls that are designed to work only when the app is active in the foreground, failures in these calls may leave the UI in an invalid state.

Implementing the Solution

Step 1: Analyze Background Activities

First and foremost, evaluate the background activities of your app, particularly the handling of silent push notifications. Are there certain operations in your viewDidLoad() that depend on these network responses?

Step 2: Condition UI Launching

To address the above issue, you can condition the launching of your UI so that it only proceeds when your app is active in the foreground. Here's how you can do it:

Add a Check for App State: Modify the logic in your app that dictates when the UI is initialized. Ensure it checks if the app is currently active (foreground) before attempting to load any UI elements reliant on network resources.

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

Step 3: Testing the Changes

After implementing the conditions, thoroughly test your application:

Run your app normally and check that the Initial View Controller loads as expected.

Simulate receiving silent push notifications and observe the behavior to ensure that the UI is appropriately managed regardless of the app state.

Wrapping Up

The issue of the Initial View Controller not loading after app suspension can be daunting, but understanding the interplay between background activities and UI initialization is key to resolving it. By conditioning your UI launches based on the app's active state and refining your background operations, you can create a smoother user experience.

With dedicated effort and the right strategies, you can tackle these nuances and enhance how your app functions, even under the challenging scenarios presented by iOS's lifecycle management.

Happy coding!