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https://issues.apache.org/jira/browse/CB-9179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14607502#comment-14607502
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George Atkins commented on CB-9179:
-----------------------------------
I have hit this issue also - it has been around for at least a year.
In CDVCompass.m, the code to get the trueHeading is:
{code:borderStyle=solid}
id trueHeading = __locationStarted ? (id)[NSNumber numberWithDouble :
hInfo.trueHeading] : (id)[NSNull null];
{code}
The issue is that the private variable __locationStarted is initialised to
"NO", and never set elsewhere, which in turn means the above code always
returns null.
It appears this variable is actually defunct, along with __highAccuracyEnabled.
It looks like CDVCompass and CDVLocation were once combined and these variables
are left over from that, as neither of these variables are set anywhere.
If I simply set __locationStarted = YES, then I get the correct trueHeading
values. Note I am using navigator.geolocation.watchPosition at the same time
too. If location services are turned off on the device then -1 is returned.
BTW - it looks like navigator.geolocation.watchLocation() is defunct as I can't
find any recent reference to it anywhere.
> [ios] the trueHeading property is still null after use
> navigator.geolocation.watchLocation()
> --------------------------------------------------------------------------------------------
>
> Key: CB-9179
> URL: https://issues.apache.org/jira/browse/CB-9179
> Project: Apache Cordova
> Issue Type: Bug
> Components: iOS, Plugin Device Orientation
> Affects Versions: 5.0.0
> Environment: iOS 8.3
> cordova-plugin-device-orientation 1.0.0
> Reporter: Colin Bau
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> according this
> https://github.com/apache/cordova-plugin-device-orientation
> it said...
> The trueHeading property is only returned for location services enabled via
> navigator.geolocation.watchLocation().
> but in fact...the trueHeading property is still null after use
> navigator.geolocation.watchLocation()
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