![]() To make MainActor work with the UI, there needs to be a way to create an actor that everyone can use when necessary. Different framework have them, and they may be found across files and different imports. You know that UI Components are quite literally, all over the place. Turns out that is a type of actor called a Global Actor. And it kind of is, but it’s not the only one of its kind. Global ActorsĮarlier we said that MainActor is a “special” kind of actor. Luckily, its usage is straightforward, and it has no magic or hidden behavior you need to concern yourself with. MainActor is a really important concept, and learning to use it properly will help you adopt the modern concurrency system easier with any of Apple’s provided UI framework. When adding to a function, the function will always execute on the main GameLibraryViewController: UIViewController To use the main actor, you need to add the attribute to a definition. Every single view or view controller needs to work on the main thread, and thus the need to access the from everywhere really increases. It’s on SwiftUI, AppKit, UIKit, watchKit… The number of places that need to run on the main thread is huge, and we aren’t even thinking of the individual UI classes within these framework that need main thread synchronization. This actor is “special” because it can be found all over Apple’s frameworks. The main actor will perform all its synchronization on the main dispatch queue. The main actor, written as represents your main thread. ![]() This mechanism exists, and it is a “special” kind of actor called the Introducing the main actor Of course, this doesn’t mean that we should try to do everything on the main thread, because if the main thready is really busy, it will result in visible performance issues for your users, and if the app becomes unresponsive, the system will kill it after a defined amount of time.īecause the new concurrency system may jump around different threads, suspending tasks, resuming others (which may do so in different threads), and so on, we need another mechanism to update our main thread. This block would run on main, making it safe to update our UI from there. Before the modern concurrency system, we could simply call and pass in a completion block. When we are running processes that are commonly asynchronous, it’s possible they will return their values on whatever thread they are running on, but we need to deliver those results the main thread. On Apple platforms, we are not allowed to update our UI in any other place outside the main thread. The Main Thread is in charge of running your UI Code. Whether you have been programming for Apple platforms for a while, or you are fairly new, chances are you have heard about the Main Thread. If you remember, an actor controls access to its properties, so a member doesn’t get written from different processes at the same time, avoiding corrupted data. We have recently talked about actors, what they are, and how to use them. Modern Swift Concurrency Summary, Cheatsheet, and Thanks.Sharing Data Across Tasks with the property wrapper in the new Swift Concurrency Model.Understanding Actors in the New Concurrency Model in Swift.Unstructured Concurrency With Detached Tasks in Swift.Introduction to Unstructured Concurrency in Swift.Structured Concurrency With Task Groups in Swift.Structured Concurrency in Swift: Using async let.Converting closure-based code into async/await in Swift.Modern Concurrency in Swift: Introduction.This article is part of my Modern Concurrency in Swift Article Series.
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