Fix SwiftUI warnings.

[Andrewangeta]

Why?

Writing to the underlying wrappedValue of a property wrapper wasn't guaranteed to be on the main thread depending on how a user might be using it.

Changes

This makes that guarantee by wrapping those write operations in a DispatchQueue

Tests

Verified on a real device using iOS 16.2 and Xcode 14.2

Issue 91

[marinofelipe]

Thanks @Andrewangeta 🙇 .

The tests are failing and I expect it's because of the async dispatch introduced, since the tests were before expecting the wrappers to be synchronously updated.

I think there a few ways we could get around that:

• Introduce some sort of abstraction for DispatchQueue which could be then injected into WrappedTextField, default to DispatchQueue.main and where a mock/fake can be injected during tests
• Introduce https://github.com/pointfreeco/combine-schedulers and use it instead to make the code run synchronously on tests

I'd personally prefer those over async expectations in order to have tests more deterministic and faster.

Let me know what you think.
I'm not sure if I can commit to your branch, so let me know if you'd like to give me edit permissions, or if you'd like to try it yourself.

[marinofelipe]

When running on Xcode 14.2 I also faced a similar warning in WrappedTextField:122, which we could also take the opportunity to fix :)

[marinofelipe]

Or perhaps will be easier to go with the async await path and make use of MainActors where needed.

[Andrewangeta]

@marinofelipe Yea I think actors would be a fair approach and to use async await as well.