iOS WatchKit - how to determine if your code is running in watch extension or the app

Question

With WatchKit you have your app that runs on the phone, and the watch app that runs as an extension.

If you create a library that contains common code to be used in both the phone app and the watch extension, is there a way to tell if the code is running in the phone app or the watch extension?

I.e.

if ([self isRunningInWatchExtension]) {
    NSLog(@"this is running on watch");
} else {
    NSLog(@"this is running on phone app");
}


- (BOOL)isRunningInWatchExtension {
    ???
}

Answer 1

I've accomplished this by checking the bundle identifier:

if ([[[NSBundle mainBundle] bundleIdentifier] isEqualToString:kAppBundleIdentifier]) {

    // Running in main app
}
else if ([[[NSBundle mainBundle] bundleIdentifier] isEqualToString:kWatchBundleIdentifier]) {

    // Running in extension
}

Answer 2

In target conditionals there are some conditionals that may help you,

#if TARGET_OS_WATCH
//do something for watch
#else
//do something for ios ==> assuming you only support two platforms
#endif