Swift Views Shouldn’t Know About Threads

Think about this one

Photo by Drew Saurus on Unsplash

Views should be rather basic, right. Have we thought about

Read on to find out all the details!

Difficulty: Beginner | Easy | Normal | Challenging

This article has been developed using Xcode 13.1, and Swift 5.5.1

Terminology

Thread: Tasks can have their own threads of execution to stop long-running tasks block the execution of the rest of the application

The motivation

Lots of my code has DispatchQueue.main.async to put us onto the main thread for UI work.

So this means that I might be communicating between a view model and view controller through a closure so I might have some code like the following:

self.viewModel.dictionarySet = { dict in
    let values = dict.allValues.description
    DispatchQueue.main.async {
         self.textView.text = values
    }
}