Automatic event-tracking in iOS apps offers a more efficient alternative to manual event-tracking by logging client-side events without the need for predefined logging code, thus eliminating the delays associated with App Store approvals and data analysis. This approach, exemplified by the Heap analytics library for iOS, utilizes method swizzling to extend existing Cocoa methods like `sendAction:to:from:forEvent:` without altering the original code, allowing automatic logging of various events such as UI interactions and view controller appearances. The technique ensures minimal performance impact by batching network requests and processing events off the main thread, thereby conserving battery life and maintaining app responsiveness. While this method provides a comprehensive view of user activity on iOS, the text suggests exploring further applications for platforms like Android and game engines such as Cocos2d or Unity, with plans to open-source their integration and seek community feedback on platforms like Twitter.