handleWatchKitExtensionRequest background task

gistfile1.swift

    func application(application: UIApplication, handleWatchKitExtensionRequest userInfo: [NSObject : AnyObject]?, reply: (([NSObject : AnyObject]!) -> Void)!) {
        let completionBlock: () -> Void = {
            reply(nil)
            UIApplication.sharedApplication().endBackgroundTask(self.updateCacheTask)
        }
        
        updateCacheTask = application.beginBackgroundTaskWithExpirationHandler(completionBlock)
        if let userLocation = DataProviderUtils.userLocationForUserInfo(userInfo) {
            DataProviderService.retrieveTripsForUserLocation(userLocation, completionBlock: completionBlock)
        } else {
            completionBlock()
        }
    }