swift - Communicate data between WatchOS & Today Extension widget -


standard set watch os > 2. wcsessiondelegate used coordinte data between main application , watch.

an app group "group.***********.todayextensionwidget" used coordinate data between main application , today extension widget via userdefaults(suitename: "group.***********.todayextensionwidget")

when make change watch communicates change main application. main application (once launched) communicates on today extension. communicate change in watch app today extension without needing launch main app first.

is there best practice communicate between watch app , today extension widget?

at moment there no way achieve using built-in frameworks. since introduction of watchos2, watchkit apps considered independent apps , not extension of ios app, hence cannot use appgroups share data between 2 , cannot use share data between watchkit app , ios extension.

as experienced, watchconnectivity cannot used in today extension, out of picture well.

your option suboptimal one, since need upload data server watchos app , download in ios today extension. of course generates unnecessary data usage, current frameworks provided apple cannot share data offline.

however, if wait until watchos4 released (or give beta version try), might able leverage corebluetooth framework, becoming available watchkit in watchos4 communicate between watchkit app , ios extension offline, using ble. not 100% sure if corebluetooth can used in ios extensions, should give try if can use watchos4 beta.


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