As of iOS 18 a 𝗦𝘄𝗶𝗳𝘁𝗨𝗜 𝗩𝗶𝗲𝘄 is always annotated with @𝗠𝗮𝗶𝗻𝗔𝗰𝘁𝗼𝗿.

If we want the closure in the task modifier to not run on the main thread, we simply need to declare it in a location that doesn’t require it to run on @MainActor.
Mastering task modifier in SwiftUI
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Sarathi Kannan
Michael Long
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Aug 29, 2024
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As of iOS 18 a 𝗦𝘄𝗶𝗳𝘁𝗨𝗜 𝗩𝗶𝗲𝘄 is always annotated with @𝗠𝗮𝗶𝗻𝗔𝗰𝘁𝗼𝗿. You'd need it elsewhere or to explicitly mark the function as nonisolated.
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Written by Michael Long14.5K Followers
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I write about Apple, Swift, and SwiftUI in particular, and technology in general. I'm also a Lead iOS Engineer at InRhythm, a modern digital consulting firm.
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