Open Radar

 
Summary:
We are using background fetch in an iPhone app and also using Darwin notifications to keep the WatchKit interface up-to-date when new data comes in. We are trying to test that that will work if a background fetch event happens while the user is interacting with the iPhone. Unfortunately, it doesn't appear that there's a way to test background fetch at the same time as a WatchKit app.

Steps to Reproduce:
1. Create an iPhone app that updates data in a background fetch.
2. Add a WatchKit extension to it.
3. Run the WatchKit extension in the simulator.
4. In Xcode, select “Debug→Simulate Background Fetch.”

Expected Results:
The background fetch happens.

Actual Results:
The background fetch does not happen.

Version:
Xcode Version 6.2 (6C107a)

Notes:
Since it’s difficult to determine if a background fetch is happening while the console output is only shown for the watch app (rdar://19386708), I use this code snippet at the beginning of ‑[UIApplicationDelegate application:performFetchWithCompletionHandler:]:

[@"" writeToFile:@"/Users/jeff/Desktop/start"
      atomically:YES
        encoding:NSUTF8StringEncoding
           error:NULL];

If the file appears on your desktop, then the fetch started.

Configuration:
iPhone Simulator (OS X 10.10.1 (14B25))