How to update Apple Watch complications automatically? - watchkit

Question

Currently, my code doesn't work. I still have to manually refresh it.
I want the complication to automatically update every 12 hours.
func getTimelineStartDate(for complication: CLKComplication, withHandler handler: #escaping (Date?) -> Void) {
let date = Calendar.current.startOfDay(for: Date())
print("timeline start date :\(date)")
handler(date)
}
func getTimelineEndDate(for complication: CLKComplication, withHandler handler: #escaping (Date?) -> Void) {
var date = Calendar.current.startOfDay(for: Date())
date = Calendar.current.date(byAdding: .day, value: 2, to: date)!
print("timeline end date:\(date)")
handler(date)
}
func getNextRequestedUpdateDate(handler: #escaping (Date?) -> Void){
handler(Date(timeIntervalSinceNow: 60*60*12))
}

Answer 1

It seems the data source methods are not implemented. It's needed to be implemented for the refresh.
At the start of a scheduled update, ClockKit calls either the
requestedUpdateDidBegin or requestedUpdateBudgetExhausted method,
depending on the state of your complication’s time budget. You must
implement one or both of those methods if you want to add data to your
timeline. Your implementation of those methods should extend or reload
the timeline of your complication as needed. When you do that,
ClockKit requests the new timeline entries from your data source. If
you do not extend or reload your timeline, ClockKit does not ask for
any new timeline entries.
func requestedUpdateDidBegin() {
let server=CLKComplicationServer.sharedInstance()
for complication in server.activeComplications {
server.reloadTimelineForComplication(complication)
}
}
For more information check this.

Answer 2

You can use the functions below to populate your complication with data.
func getCurrentTimelineEntry(for complication: CLKComplication, withHandler handler: #escaping (CLKComplicationTimelineEntry?) -> Void) {
// Call the handler with the current timeline entry
handler(nil)
}
func getTimelineEntries(for complication: CLKComplication, before date: Date, limit: Int, withHandler handler: #escaping ([CLKComplicationTimelineEntry]?) -> Void) {
// Call the handler with the timeline entries prior to the given date
handler(nil)
}
func getTimelineEntries(for complication: CLKComplication, after date: Date, limit: Int, withHandler handler: #escaping ([CLKComplicationTimelineEntry]?) -> Void) {
// Call the handler with the timeline entries after to the given date
handler(nil)
}
See the App Programming Guide for watchOS