Ultimate Solution for iOS Launch Image Issues

This article addresses common iOS launch image problems such as images not updating or failing to render properly. The author provides a comprehensive analysis of the issue and presents a practical solution.

The article begins by explaining the background of iOS launch images and the challenges developers face when updating them. It discusses Apple's requirement since 2020 to use storyboard for launch image configuration and the problems that arise from this approach, including white screens and outdated images.

Through extensive testing and analysis, the author discovers that iOS generates cached launch images in the app's sandbox directory. The system creates multiple images based on supported orientations and themes (light/dark mode). The author provides detailed steps to locate these cached images and explains how the system manages them.

The proposed solution involves replacing the system-generated cached launch images with custom-generated ones. The article provides code examples for generating launch images from storyboard and replacing cached files. It also addresses platform-specific issues, particularly for iOS 9.x and below where file system permissions differ.

The author includes optimizations such as caching strategies to improve performance and discusses handling different screen orientations for iPhone and iPad devices. The article concludes with a summary of findings across different iOS versions and a call for Apple to improve this system behavior.

Demo source code is available at: https://github.com/iversonxh/DynamicLaunchImage