My goal is to send a huge dictionary (containing about 10 arrays) from the iOS app to the watchKit app, but I'm not getting any output on the watchKit's end.
If I send a string, the following example works fine:
let message = [ "fromParent": "some string" ]
session.sendMessage(message, replyHandler: { replyDict in }, errorHandler: { error in })
but when I try to send a dictionary, I'm not getting any output at all:
let message = [ "fromParent": dictionary ]
session.sendMessage(message, replyHandler: { replyDict in }, errorHandler: { error in })
This is how I print out the output on the watchKit's end:
func session(session: WCSession, didReceiveMessage message: [String: AnyObject], replyHandler: [String: AnyObject] -> Void) {
guard let parentMessage = message["fromParent"] as? String else { return }
print(parentMessage)
}
I cannot transfer (>100kb) the large dictionary via sendMessage (just relatively small ones)
The PayloadTooLarge error was already mentioned.
If you implement a proper error handler, you will see that the sendMessage fails because you exceeded the amount of data you could send in a message.
session.sendMessage(message, replyHandler: nil, errorHandler: { (error) -> Void in
print("sendMessage failed with error \(error)")
})
Alternative approaches:
It's impractical to send such large amounts of data, and subject the user to long load times.
If possible, you should bundle any preloaded/static data in the watch bundle so it doesn't need to be transferred in the first place.
If there's no other way around needing to transfer such large amounts of data between the phone and watch, you'll need to use transferFile:metadata: (which is only subject to remaining space limits on the watch).