Thansks for reply. When is the best time to schedule background refresh? Is complication necessary for background refresh?

Thanks for reply. background fetch if not supported on watchos "class ApplicationDelegate: NSObject, WKApplicationDelegate" is a WKApplicationDelegate subclass, which is registered by @WKApplicationDelegateAdaptor WKApplication.shared().scheduleBackgroundRefresh is called in BackgroundRefreshManager.scheduleBackgroundRefresh Is complication necessary for backgroud refresh?