# Page Not Found

The URL `ios-dev/fundamental` does not exist.

You might be looking for one of these pages:
- [iOS Foundation](https://www.doruby.com/mobile/fundamental.md)
- [ARC 与内存管理](https://www.doruby.com/mobile/fundamental/arc-yu-nei-cun-guan-li.md)
- [iOS 手势识别](https://www.doruby.com/mobile/fundamental/ios-shou-shi-shi-bie.md)
- [UIKit Class Hierarchy](https://www.doruby.com/mobile/fundamental/uikit-class-hierarchy.md)
- [iOS 手势操作详解](https://www.doruby.com/mobile/fundamental/ios-shou-shi-cao-zuo-xiang-jie.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://www.doruby.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://www.doruby.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/mobile/fundamental.md`)
- Use `Accept: text/markdown` header for content negotiation