WatchOS 1 causes issues on iOS app and making it restart

You can't prevent an app termination.

iOS may close your app anytime.

So, what you can do is save your data in a file on willTerminate and load it on next run.

You can use NSKeyedArchiver, it's pretty simple.

Thanks PrinceCreed, but the problem is that the app was not terminated (OS wise) as I have never reached willTerminate method.

I just found another thread talking exactly on the same issue I experience:

• App is getting killed by iOS.
• Watchkit extension calls iOS app using openParentApplication.
• handleWatchKitExtensionRequest is getting called BEFORE APP IS RESTARTED (hence the ivar is nil).
• App is restarted by iOS and didFinishLaunching is getting called.

https://forums.developer.apple.com/thread/8057

Anyone experienced the same? Any idea for solution? Is this a bug or a feature?

Ah, yes!

I had the same problem. I solved creating a loadApp method.

- (void) loadApp {
    // load ivars

    hasLoaded = YES;
}

I use it in didFinishLaunchingWithOptions to normally load my ivars:

    // load application
    if (!hasLoaded) {
        [self loadApp];
    }

Then in handleWatchKitExtensionRequest I do the same:

- (void)application:(UIApplication *)application handleWatchKitExtensionRequest:(NSDictionary *)userInfo reply:(void (^)(NSDictionary *))reply {
    dispatch_async(dispatch_get_main_queue(), ^{
        // set a background task
        __block UIBackgroundTaskIdentifier backgroundTask;
        backgroundTask = [application beginBackgroundTaskWithExpirationHandler:^{
            [application endBackgroundTask:backgroundTask];
            backgroundTask = UIBackgroundTaskInvalid;
            reply(nil);
        }];

        // load application
        if (!hasLoaded) {
            [self loadApp];
        }

        // do something
        reply(nil);

        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)NSEC_PER_SEC * 2), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            // end background task
            [application endBackgroundTask:backgroundTask];
            backgroundTask = UIBackgroundTaskInvalid;
        } );
    });
}