This article provides a comprehensive overview of Grand Central Dispatch (GCD) for iOS developers, explaining its significance in multithreading. It details basic concepts, including threads, tasks, and queues, and discusses various types of queues such as main and global, as well as their priorities via Quality of Service (QoS). The article emphasizes the practical applications of GCD in executing tasks asynchronously or synchronously while avoiding common issues like deadlock. Its clear and jargon-free language makes it a resource for both beginners and experienced developers looking to enhance their understanding of multithreading.
In this article, we will cover Grand Central Dispatch (GCD) once and for all. Although GCD might seem outdated now that Swift Modern Concurrency exists, code using this framework will continue to appear for many years.
Today we will focus solely on the fundamental understanding of GCD. We will only examine key aspects of multithreading in detail, including the relationship between queues and threads.
Multithreading - the ability of a system to execute several threads concurrently (at the same time). This allows multiple branches of code to run in parallel.
Thus, GCD is a tool that makes it easy to write code that executes concurrently, offloading heavy computations to separate threads to avoid interrupting UI updates.
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