Asynchronous Design Patterns with Blocks, GCD, and XPC

Blocks, Grand Central Dispatch, and XPC form a powerful foundation for asynchronous processing and communication in your app. Dive into the basics around blocks, GCD, and XPC and learn about their improved integration with ARC. Discover the common design patterns used when writing asynchronous code to offload work from your main thread, perform IO in the background or send messages to other processes, and how to apply these same patterns to your own code.

WWDC 2012 - Session 712 - iOS, macOS