--- title: An Even Closer Look at Protocols and Global Actors description: A deep dive into how Swift protocols interact with global actors like @MainActor, exploring the trade-offs between whole-protocol isolation and per-requirement... canonical: https://daily.dev/posts/an-even-closer-look-at-protocols-and-global-actors-vi6craiff twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: An Even Closer Look at Protocols and Global Actors | daily.dev og:description: A deep dive into how Swift protocols interact with global actors like @MainActor, exploring the trade-offs between whole-protocol isolation and per-requirement... og:url: https://daily.dev/posts/an-even-closer-look-at-protocols-and-global-actors-vi6craiff og:image: https://api.daily.dev/og/posts/Vi6CraiFf.png og:image:alt: An Even Closer Look at Protocols and Global Actors og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # An Even Closer Look at Protocols and Global Actors **[Matt Massicotte](https://daily.dev/sources/massicotte)** · 8 min read · 0 upvotes · 0 comments ## Summary A deep dive into how Swift protocols interact with global actors like @MainActor, exploring the trade-offs between whole-protocol isolation and per-requirement isolation. Covers a surprising compiler limitation that prevents actors from conforming to global-actor-isolated protocols — and reveals it's an artificial restriction being fixed. Also examines how protocol isolation behaves differently when conformance is declared at the type level versus in an extension, and argues that nonisolated protocols with Swift 6.2's isolated conformances feature are often the better design choice. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Swift protocols and the main actor](https://daily.dev/posts/swift-protocols-and-the-main-actor-c2wwa6hx1) · Swift by Sundell · 1 upvotes · 0 comments - [Approachable Concurrency in Swift 6.2: A Clear Guide](https://daily.dev/posts/approachable-concurrency-in-swift-6-2-a-clear-guide-srya8fign) · SwiftLee · 1 upvotes · 0 comments - [Should you opt-in to Swift 6.2’s Main Actor isolation? – Donny Wals](https://daily.dev/posts/should-you-opt-in-to-swift-6-2-s-main-actor-isolation-donny-wals-n4cyosvtk) · Donny Wals · 0 upvotes · 0 comments - [Letting Swift Closures Automatically Inherit Isolation](https://daily.dev/posts/letting-swift-closures-automatically-inherit-isolation-ekio3xzqq) · Fatbobman · 0 upvotes · 0 comments --- Tags: [#swift](https://daily.dev/tags/swift), [#swiftui](https://daily.dev/tags/swiftui) [View this post on daily.dev](https://daily.dev/posts/an-even-closer-look-at-protocols-and-global-actors-vi6craiff) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"An Even Closer Look at Protocols and Global Actors","url":"https://daily.dev/posts/an-even-closer-look-at-protocols-and-global-actors-vi6craiff","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/an-even-closer-look-at-protocols-and-global-actors-vi6craiff"},"datePublished":"2026-08-03T16:34:47.313Z","dateModified":"2026-08-03T16:35:23.963Z","description":"A deep dive into how Swift protocols interact with global actors like @MainActor, exploring the trade-offs between whole-protocol isolation and per-requirement...","image":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","thumbnailUrl":"https://media.daily.dev/image/upload/s--58gMhC4P--/f_auto/v1722860399/public/Placeholder%2012","isAccessibleForFree":true,"articleSection":"Matt Massicotte","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Matt Massicotte","logo":"https://media.daily.dev/image/upload/logos/placeholder.jpg","url":"https://daily.dev/sources/massicotte"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/an-even-closer-look-at-protocols-and-global-actors-vi6craiff","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"swift,swiftui","timeRequired":"PT8M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Matt Massicotte","item":"https://daily.dev/sources/massicotte"},{"@type":"ListItem","position":3,"name":"An Even Closer Look at Protocols and Global Actors"}]} ```