...It explains practical compatibility issues that developers faced when Apple introduced stricter networking and platform requirements. A major topic is App Transport Security, including the shift toward HTTPS and TLS 1.2 for network requests. The repository is useful as a historical migration guide for Objective-C and iOS developers maintaining older apps. It collects notes, examples, and adaptation strategies rather than functioning as a single reusable library. Its main value is helping developers understand what changed in iOS 9 and how those changes affected existing application code.