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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
import UIKit
/// Contains static, unchanging information about the current `UIDevice`, like the model and system version.
///
/// This makes it easier for code that runs on a background thread (without an asynchronous context) to use these values.
///
/// **Never put values in here that might change during runtime.**
struct UIDeviceDetails {
/// The model of the device.
static let model = {
getMainThreadDataSynchronously { UIDevice.current.model }
}()
/// The style of interface to use on the current device.
static let userInterfaceIdiom = {
getMainThreadDataSynchronously { UIDevice.current.userInterfaceIdiom }
}()
/// The current version of the operating system.
static let systemVersion = {
getMainThreadDataSynchronously { UIDevice.current.systemVersion }
}()
/// Never instantiate this type.
private init() {}
// MARK: Helper method
/// This nonisolated function will execute the `work` closure on the main thread to return a value outside an
/// asynchronous or main actor context. It will synchronously suspend if necessary to wait for the MT.
///
/// **DO NOT USE THIS METHOD ELSEWHERE IN THE CODE BASE.**
/// This is a workaround to access unchanging `UIDevice.current` values that Apple has needlessly main actor-isolated.
private static func getMainThreadDataSynchronously<T: Sendable>(
work: @MainActor @Sendable () -> (T)
) -> T {
if Thread.isMainThread {
MainActor.assumeIsolated {
work()
}
} else {
DispatchQueue.main.sync {
work()
}
}
}
}