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This skill provides expert guidance on Objective-C's block syntax and Grand Central Dispatch (GCD) API, enabling developers to build responsive, thread-safe iOS and macOS applications. It covers essential patterns such as the weak-strong dance to prevent retain cycles, managing serial and concurrent dispatch queues, coordinating multiple asynchronous tasks with dispatch groups, and implementing thread-safe singletons. Whether refactoring legacy code or optimizing performance, this skill ensures professional-grade concurrency implementation following Apple’s best practices for memory management and thread safety.
