Mastering Swift 2 Programming (Video 38)

This video tutorial explains how to use dispatch groups in Grand Central Dispatch (GCD) to manage asynchronous tasks in iOS applications. It covers creating a simple Xcode project, implementing time-consuming tasks on background queues, and using dispatch groups to ensure tasks complete before proceeding. The tutorial also discusses the use of dispatch group enter and leave to manage task execution and introduces dispatch group notify as an alternative to blocking threads. The video concludes with a brief overview of concurrent work using NS thread and NS operation queue.

What are the potential downsides of blocking threads in an application?

How does dispatch group notify differ from dispatch group wait?

In what scenarios would you prefer using NSOperationQueue over Grand Central Dispatch?