Hi there,
I run an interesting little project that provides an application across quite a
few different OSs - with a Qt/QWidget UI for Windows, Mac, and various Linux
flavors, and a QML UI (with currently significantly limited functionality) that
can be built for Mac and Linux, but that is mainly targeted at Android and iOS.
Our Android app has been in testing for a while and was recently released and
QGeoPositioningInfoSource there seems to be doing what I expected it to do, but
on iOS (our newest platform where we just started beta testing) I'm running
into some problems:
a) on iPads without GPS (so only WiFi location guestimation),
supportedPositioningMethods() returns
QGeoPositionInfoSource::AllPositioningMethods, therefore claiming that there
are satellite based positioning methods available, even though there clearly
aren't.
b) regardless of the update interval given via setUpdateInterval() the
application receives a nearly constant flow of positionUpdated() signals -
usually more than once a second
c) even though the Info.plist file contains
<key>NSLocationAlwaysUsageDescription</key>
<string>Explanation why</string>
the position information service stops the moment the application is no longer
running in the foreground (and resumes once the application is in the
foreground again)
Looking at the ObjectiveC APIs for position services on iOS neither of these
three issues are platform limitation. iOS clearly tells an app whether a
satellite based position service is available, iOS allows positionUpdates to be
delayed both by time interval and (that's something I'd love to see in the Qt
API) by geo-fencing, specifically distance from the last fix. And iOS allows
applications to continue to receive position updates in the background and when
the phone is asleep (that's the perfect of the Info.plist key mentioned under
c).
Any help addressing these issues would be extremely welcome!
Thanks
/D_______________________________________________
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