Can I send some info to apple watch from iOS app using Watch Connectivity if apple watch inactive?

Question

I have iOS app and watchOS, I need to get some info from iOS app to watchOS, when apple watch opens in first time.

User opens iOS app -> get userID from backend -> after some time opens apple watch -> get info from backend using userID from iOS app

How can I do this?

Keychain with iCloud doesn`t fit me. Any other ideas?

It is less secure than a local version but there are plenty of encryption providers and “private info” is usually stored in keychain. So it all depends — lorem ipsum, Aug 31 '23 at 10:37

Reinhard Männer · Answer 1 · 2023-08-11T18:18:25.347

Yes, when there is an active session. The docs say:

Most transfers happen in the background when the receiving app is inactive.

Specifically, when a watch session is active, you can use

updateApplicationContext(_:) This function transfers some info, but overwrites any previously sent application context.
transferUserInfo(_:) This function is used, if all transferred data are needed, i.e. previously sent data are not overwritten, but queued.
transferFile(_:metadata:) This function is used to transfer not a user info, but a file.
transferCurrentComplicationUserInfo(_:) This function transfers data to update watch complications.

All of them work in the background.

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