Unfortunately, I haven't been able to find much documentation on example usages of AsyncSequence, particularly with the AsyncStream implementation, but I'm trying to understand these on a deeper level.

At the moment, I'm interested in converting something like a subscription-based Cancellable that lives for the lifetime of a view controller and reacts to any changes in an observed property.

Is this an appropriate use case for AsyncSequence? From what I understand, you would observe the sequence with a for-in loop, but is it possible to continue watching for changes after the observed property has been updated once, or is it only a one-and-done type of usage?

CodePudding user response：

"Is this an appropriate use case for AsyncSequence" It is exactly the use case for AsyncSequence.

But wait, there's more! Every Combine publisher has a values property which is an AsyncSequence. If you already have a publisher, there is nothing to "convert". Just use that publisher's values in an async context and away you go.

Example:

let timerpub = Timer.publish(every: 1, on: .main, in: .default).autoconnect()
Task {
    for await value in timerpub.values {
        // do something with `value`! called every second
    }
}