Chapter 2
Managing Concurrency with (Grand Central) Dispatch
Section 3
Other Dispatch Features
Serial queues are Dispatch's more powerful feature, however there are a number of additional features this library provides that you will be able to use often - Our first example will be global queues, and particularly the main queue. This queue becomes essential when you begin working with Apple's GUI frameworks - Quality of Service is an important concept to take into account once you start to develop large and complex applications, so let us make sure to cover this concept - Dispatch provides a number of APIs that allow us to delay execution of simple tasks for a period of time. time to time in GUI applications