WatchKit return reply() inside a block in handleWatchKitExtensionRequest:

Question

I saw this SO post where apparently data was being fetched and returned to the Watch extension like so:

- (void)application:(UIApplication *)application handleWat         


        

Answer 1

Always refer to official documentation. Official Documentation

The following code works for me.

__block UIBackgroundTaskIdentifier bgTask = [application beginBackgroundTaskWithName:@"MyTask" expirationHandler:^{
                // Clean up any unfinished task business by marking where you
                // stopped or ending the task outright.
                [application endBackgroundTask:bgTask];
                bgTask = UIBackgroundTaskInvalid;
        }];

// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

// Do the work associated with the task, preferably in chunks.

    [ClassObject getDataWithBlock:^(BOOL succeeded, NSError *error){

        if (succeeded)
        {
            [response setObject:@"update succeded" forKey:@"updateKey"];
            reply(response);

        }
        else
        {
            if (error)
            {
                [response setObject:[NSString stringWithFormat:@"update failed: %@", error.description] forKey:@"updateKey"]; 

                reply(response);
            }
            else
            {
                [response setObject:@"update failed with no error" forKey:@"updateKey"];

                reply(response);
            }
        }
    }];
    [application endBackgroundTask:bgTask];
    bgTask = UIBackgroundTaskInvalid;
});