iOS 8 - CLLocationManager authorization

iOS8 introduced a new authorization scheme for Location data.
Before retrieving location data, CLLocationManager must request authorization.
Call two methods: requestAlwaysAuthorization/requestWhenInUseAuthorization
on a location manager (which one will work/preferred - can be adjusted
by setting NSLocationAlwaysUsageDescription/NSLocationWhenInUseUsageDescription
entries in a plist).

Task-number: QTBUG-41827
Change-Id: I9fc24921dc7d889b629b2c71e7698a33fc6ae47a
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>

src/plugins/position/corelocation/qgeopositioninfosource_cl.mm

@@ -137,6 +137,14 @@ bool QGeoPositionInfoSourceCL::enableLocationManager()
         m_locationManager = [[CLLocationManager alloc] init];
         m_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
         m_locationManager.delegate = [[PositionLocationDelegate alloc] initWithInfoSource:this];
+
+        // These two methods are new in iOS 8. They require NSLocationAlwaysUsageDescription
+        // and NSLocationWhenInUseUsageDescription to be set in Info.plist to work (methods are
+        // noop if there are no such entries in plist).
+        if ([m_locationManager respondsToSelector:@selector(requestAlwaysAuthorization)])
+            [m_locationManager performSelector:@selector(requestAlwaysAuthorization)];
+        if ([m_locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
+            [m_locationManager performSelector:@selector(requestWhenInUseAuthorization)];
     }
 
     return (m_locationManager != 0);

src/positioning/qgeopositioninfosource.cpp

@@ -376,6 +376,16 @@ QStringList QGeoPositionInfoSource::availableSources()
     lost or if a hardware error is detected.  Position updates will recommence if the data becomes
     available later on.  The updateTimeout() signal will not be emitted again until after the
     periodic updates resume.
+
+    On iOS, starting from version 8, Core Location framework requires additional
+    entries in the application's Info.plist with keys NSLocationAlwaysUsageDescription or
+    NSLocationWhenInUseUsageDescription and a string to be displayed in the authorization prompt.
+    The key NSLocationWhenInUseUsageDescription is used when requesting permission
+    to use location services while the app is in the foreground.
+    The key NSLocationAlwaysUsageDescription is used when requesting permission
+    to use location services whenever the app is running (both the foreground and the background).
+    If both entries are defined, NSLocationWhenInUseUsageDescription has a priority in the
+    foreground mode.
 */
 
 /*!