Indicates that a requested update has begun so that you have an opportunity to extend or reload your timeline.
- watchOS 2.0–4.0Deprecated
When the date returned by the
get method of your data source passes, ClockKit begins a scheduled update of your complication. At the start of that update, it calls this method or the
requested method to let you know that the requested update has begun. These methods are your opportunity to tell ClockKit whether or not you have new data to add to your timeline.
If you have new data for your timeline, your implementation of this method should call the
extend method of the complication server. ClockKit does not ask your data source for new timeline entries unless you call one of those methods. If you do nothing or do not implement this method, ClockKit calls only the
get of your data source to fetch a new update time.