Worked on the Tencent-TDS/KuiklyUI repository to deliver cross-platform text selection highlight color customization for input fields, focusing on macOS, iOS, and OHOS. The solution centralized selection color management by introducing a LocalTextSelectionColors provider, replacing per-field selectionColor properties and enabling consistent theming across platforms. Refactoring input components improved API consistency and normalized alpha handling for better readability. Addressed platform-specific compatibility using guard macros and SDK-safe Objective-C patterns, such as performSelector for older iOS versions. Updated demos and documentation to reflect the new approach, leveraging C++, Swift, and UI/UX design skills to modernize and streamline the codebase.