send message from AppleWatch to iPhone app using watchOS2 - ios

Question

I tried to send message to iPhone app from iwatchExtension(on ButtonClick) using WCSession method like
[[WCSession defaultSession] sendMessage:applicationData
replyHandler:^(NSDictionary *reply)
But delegate method
- (void)session:(WCSession *)session didReceiveMessage: is not getting called.
when I tried same while passing data from iPhone to iWatch, it works properly. All delegate methods get called properly in "Extension Delegate" class.

Answer 1

If you check the definition of WCSession delegate methods you will find a minor difference about their receiving nature. Check the bold quote.
/** Called on the delegate of the receiver. Will be called on startup
if the incoming message caused the receiver to launch. */
- (void)session:(WCSession *)session didReceiveMessage:(NSDictionary *)message;
/** Called on the delegate of the receiver when the sender sends a
message that expects a reply. Will be called on startup if the
incoming message caused the receiver to launch. */
- (void)session:(WCSession *)session didReceiveMessage:(NSDictionary *)message
replyHandler:(void(^)(NSDictionary
*replyMessage))replyHandler;
As you are providing a non-null parameter for replyHandler:, you should be receiving the message in other delegate i.e. -(void)session:(WCSession *)session didReceiveMessage:(NSDictionary<NSString *, id> *)message.
You are using [WCSession defaultSession] sendMessage: ...] for communication, which lacks the delegate assignment plus you have not activated the session.
In your Extention class, create an ivar for WCSession and write this code
- (void)awakeWithContext:(id)context {
[super awakeWithContext:context];
// Configure interface objects here.
if([WCSession isSupported])
{
session = [WCSession defaultSession];
session.delegate = self;
[session activateSession];
}
}
and then send message like [session sendMessage:applicationData replyHandler:^(NSDictionary *reply).
In your AppDelegate.m file just create and instance of WCSession and activate it and use the correct delegate method to capture the message.
if([WCSession isSupported]) {
appSession = [WCSession defaultSession];
appSession.delegate = self;
[appSession activateSession];
}
I believe this should solve your problem.