iOS Location Background Service stops after 10 minutes - gps

Question

I have a Titanium app that registers an iOS background service, which logs the device's GPS data every 30 seconds. I've registered it as a location service, which is supposed to prevent it from stopping after 10 minutes, however it's not working. Here is the relevant portion of my tiapp.xml:
<ios>
<plist>
<dict>
<key>UISupportedInterfaceOrientations~iphone</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationPortraitUpsideDown</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UISupportedInterfaceOrientations~ipad</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
<string>UIInterfaceOrientationPortraitUpsideDown</string>
<string>UIInterfaceOrientationLandscapeLeft</string>
<string>UIInterfaceOrientationLandscapeRight</string>
</array>
<key>UIBackgroundModes</key>
<array>
<string>location</string>
</array>
<key>UIRequiredDeviceCapabilities</key>
<array>
<string>gps</string>
<string>location-services</string>
</array>
</dict>
</plist>
</ios>
Here is how I register it in alloy.js:
if(utils.ios) {
console.log('registering ios background service');
Ti.App.iOS.registerBackgroundService({ url: 'tracking/backgroundService.js' });
}
And the background service itself:
var timeout = constants.tracking.interval * 1000;
console.log('starting background gps tracking');
setInterval(function() {
var user = settings.user();
if(user && user.password) {
//user is logged in, let's track them.
gpsTracking.track();
}
else {
console.log('user is not logged in so not tracking');
}
}, timeout);
This was tested on the iPhone Simulator, I haven't tested on an actual iOS device because the developer site is still down so I can't create a provisioning profile.
I checked my info.plist in the build folder and it's correctly adding the key/array values for UIBackgroundModes and UIRequiredDeviceCapabilities, so I'm not sure what to check next.
Any ideas?

Answer 1

Please refer Mr.Chris Bill's answer here. I'll describe it for you.
Here is a great resource for understanding how the app interacts with the
background. There are only a couple different types of apps that are
allowed to run in the background (and execute code) for extra time. (I
think the normal limit is about 10 minutes).
Apps that play audible content to the user while in the background, such as a music player app
Apps that keep users informed of their location at all times, such
as a navigation app
Apps that support Voice over Internet Protocol
(VoIP)
Newsstand apps that need to download and process new content
Apps that receive regular updates from external accessories
Support for some types of background execution must be declared in advance by
the app that uses them. An app declares support for a service using
its Info.plist file. Add the UIBackgroundModes key to your Info.plist
file and set its value to an array containing one or more of the
following strings:
audio : The app plays audible content to the user
while in the background. (This content includes streaming audio or
video content using AirPlay.)
location : The app keeps users informed of
their location, even while it is running in the background.
voip : The app provides the ability for the user to make phone calls using an
Internet connection.
newsstand-content : The app is a Newsstand app that
downloads and processes magazine or newspaper content in the
background.
external-accessory—The app works with a hardware accessory
that needs to deliver updates on a regular schedule through the
External Accessory framework. bluetooth-central—The app works with a
Bluetooth accessory that needs to deliver updates on a regular
schedule through the CoreBluetooth framework.
So take the info.plist file from your build folder and put it into the root of your project.
Then edit it as described above. Hope this helps!

Answer 2

I face the same problem,seems titanium has a cache logic for GPS location, and can't get the actual latitude and longitude.Also meet the problem like you, 10 minutes it stopped, and if I initial the system iOS map to get the location successfully, back to titanium app, it works again. Very wired.
After a long time investigation and try.
Finally solve the problem by setting the accuracy to ACCURACY_NEAREST_TEN_METERS and using the location event. Now I can get continually GPS updating, the accuracy is also very good, 5 meters.
Titanium.Geolocation.setAccuracy(ACCURACY_SET);
Ti.Geolocation.addEventListener('location',evtGpsResult);
Hope it can save your problem.