Timer.scheduledTimer on MainActor

TimerOnMainActor.swift

import Foundation

extension Timer {
    @MainActor @discardableResult static func scheduledTimerOnMainRunLoop(withTimeInterval: TimeInterval, repeats: Bool, block: @escaping @MainActor (Timer) -> Void) -> Timer {
        // The doc says: Creates and returns a new NSTimer object initialized with the specified block object and schedules it on the current run loop
        // But the block is not annotated with @MainActor and we need MainActor.assumeIsolated
        // Since Timer is non-Sendable, capture by nonisolated(unsafe) to pass from nonisolated context to MainActor.
        Timer.scheduledTimer(withTimeInterval: withTimeInterval, repeats: repeats) { timer in
            nonisolated(unsafe) let timer: Timer = timer
            MainActor.assumeIsolated {
                block(timer)
            }
        }
    }
}