The latest articles on DEV Community by KevinLeeeee323 (@kevinleeeee323). https://dev.to/kevinleeeee323 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4032941%2F24b0edd0-4b6e-4f9d-8c15-4eed546f8e49.png https://dev.to/kevinleeeee323 en KevinLeeeee323 Fri, 17 Jul 2026 01:48:40 +0000 https://dev.to/kevinleeeee323/5-painful-bugs-i-hit-building-an-ios-epub-reader-with-swiftui-wkwebview-319c https://dev.to/kevinleeeee323/5-painful-bugs-i-hit-building-an-ios-epub-reader-with-swiftui-wkwebview-319c <p>I got tired of reaching out of my blanket to tap the screen every page, so I built SwiftBook: an Apple Books-style EPUB reader for iOS that lets you turn pages with the volume buttons.</p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fshygu3gnfcm981aap9os.JPEG" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fshygu3gnfcm981aap9os.JPEG" alt="UI Display" width="800" height="805"></a></p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fddkxm30gsbnx3zhqx5ms.gif" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fddkxm30gsbnx3zhqx5ms.gif" alt="Use Volum Button As Page Turner" width="600" height="338"></a></p> <p><strong>What it does</strong>: </p> <ul> <li>Import EPUBs → read with tap / swipe / progress bar / <strong>volume button</strong> page turns</li> <li>5 fonts (PingFang, Source Han Serif Regular/SemiBold/Bold, Georgia)</li> <li>4 reading themes (white · warm · dark · eye-care green)</li> <li>Font size, line spacing, margins, alignment — all adjustable</li> <li>Resume reading, TOC with chapter jump</li> </ul> <p><strong>Tech stack</strong>: SwiftUI + WKWebView. Pagination uses CSS multi-column layout rather than native scroll. Volume button detection uses AVAudioSession KVO + a silent looping WAV to keep the audio session alive.</p> <p><strong>The README has a detailed "Lessons Learned" section</strong> covering:</p> <ul> <li>Why WKWebView dimensions must be constant (or pages jump around)</li> <li>The quote-escaping bug that silently broke ALL JS interactivity</li> <li>Why you can't read @Binding during loadContent (progress reset to 0%)</li> <li>Gesture arena conflicts between tap zones and swipe on WebView</li> </ul> <p>🔗 GitHub: <a href="https://github.com/KevinLeeeee323/SwiftBookApp" rel="noopener noreferrer">https://github.com/KevinLeeeee323/SwiftBookApp</a></p> <p>MIT licensed. Free to use, modify, contribute. Built with help from Claude / Codex / Deepseek.</p> <p>Would love feedback — this is my first iOS app!</p> swift ios swiftui opensource