Concurrency and multithreading are a core part of iOS development. Understanding them and understanding how to properly leverage them is a key part of developing a high-quality app. Lack of concurrency usually leads to having nonresponsive apps that freeze up once a heavy operation is being performed.
What Is Concurrency?
The concept of concurrency is that two or more tasks can be defined independently and each task can be executed regardless if the other tasks are executing or not. This ...