Events created on Google calendar on iOS reflects only if I launch apple calendar first and then open the app

[Praveena0989]

Describe the bug
Events created on Google calendar on iOS won't come in device calendar API response, and it will start coming once I open the apple calendar app and then open my app. Is this expected behavior?

[lukemmtt]

To close the loop here, this is normal behavior for iOS devices, and is an OS nuance, not something specific to device_calendar or Flutter.

Specifically, Google Calendar does sync with the Apple Calendar automatically in the background (based on the user's refresh frequency in iOS Settings app > Calendar), but even with the most aggressive setting there, there are still some delays, and the only way to force a sync is to open the iOS Calendar app.

I hope that helps. This issue should now be closed.

[Praveena0989]

I fixed it by calling refreshSourcesIfNecessary()

[lukemmtt]

Good to know, thanks for sharing!

[thomassth]

This seems to be an important calendar related API to implement, even if it only concerns iOS.

Reference:
https://developer.apple.com/documentation/eventkit/ekeventstore/1507421-refreshsourcesifnecessary